☆ 4.7 Review

Post-processing of additively manufactured high-entropy alloys-A review

JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T (2022)

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Additive manufacturing of high-strength and ductile high entropy alloy CoCrFeNiW0.2 composites via laser powder bed fusion and post-annealing

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Research on microstructure and mechanical properties of FeCoNi1.5CuB0.5Y0.2 high entropy alloy treated by cryogenic treatment

G. R. Li et al.

Summary: This paper investigates the microstructure, micro zone performance, and compressive properties of FeCoNi1.5CuB0.5Y0.2 high-entropy alloys under different cryogenic treatment parameters. The optimized sample with cryogenic treatment exhibits increased phase quantity, reduced size, and the appearance of numerous nanoparticles. It also shows improved nano-hardness, compressive strength, and fracture toughness compared to the untreated sample.

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Summary: This review explores the fundamental procedures of additive manufacturing, including the formation and binding of melt pools, and discusses the evolution mechanisms of microstructures during the process. The review also proposes multistage control methods based on solidification and dislocation theories. Additionally, it addresses the design of microstructures for additive manufacturing through adjustment of process parameters and alloy composition.

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Amorphization, mechano-crystallization, and crystallization kinetics of mechanically alloyed AlFeCuZnTi high-entropy alloys

Sara Daryoush et al.

Summary: Equiatomic and non-equiatomic AlFeCuZnTi high-entropy alloys were prepared by high energy ball milling of elemental powders. Depending on the chemical composition, either an amorphous phase or BCC solid solution was obtained. The crystallization kinetics of the amorphous HEA was studied using DSC, showing a correlation between crystallization activation energy and self-diffusion activation energy of the constituting elements.

MATERIALS LETTERS (2022)

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Effect of annealing on microstructure and mechanical properties of AlCrFe2Ni2 medium entropy alloy fabricated by laser powder bed fusion additive manufacturing

Tianyi Han et al.

Summary: In this study, a Co-free AlCrFe2Ni2 medium entropy alloy (MEA) was fabricated using laser powder bed fusion additive manufacturing and treated with subsequent annealing to achieve good strength-ductility synergy. The microstructure, phase distribution and mechanical properties of the as-built and annealed alloys were investigated. The results showed that annealing led to a transformation of the microstructure and an improvement in ductility, while the compressive yield strength decreased.

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING (2022)

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Alloy design via additive manufacturing: Advantages, challenges, applications and perspectives

Amit Bandyopadhyay et al.

Summary: Additive manufacturing (AM) is rapidly transforming production environments in various industries. New design strategies have been developed to address large-scale materials and design issues, particularly in alloy design. Directed energy deposition (DED) and powder bed fusion (PBF) based AM enable rapid innovation and evaluation of new alloys at a lower cost and shorter lead time.

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Friction stir-based additive manufacturing

Rajiv S. Mishra et al.

Summary: Additive manufacturing has revolutionized component manufacturing and qualification by providing opportunities for topological optimization. Friction stir additive manufacturing and additive friction stir deposition utilize intense shear deformation to create microstructures that exhibit improved mechanical properties compared to conventionally processed alloys. Optimal mechanical properties can be achieved through alloy design, although further research is needed to apply these processes to high-temperature materials.

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Microstructure evolution of additively manufactured CoCrFeNiAl0.4 high-entropy alloy under thermo-mechanical processing

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Summary: The microstructure and texture evolution during thermo-mechanical processing and their relationship with the mechanical properties were investigated in the non-equiatomic CoCrFeNiAl0.4 high-entropy alloy. It was found that annealing twins play a significant role in the texture evolution, and the work hardening rate is relatively stable under 30%-45% plastic deformation.

JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T (2022)

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Grain refinement and property improvements of Al-Zn-Mg-Cu alloy by heterogeneous particle addition during wire and arc additive manufacturing

Tao Yuan et al.

Summary: This research focused on grain refining of Al-Zn-Mg-Cu alloys by adding TiN particles during wire and arc additive manufacturing (WAAM). The addition of TiN particles led to equiaxed grains, reduced grain size, and improved mechanical properties of the alloy.

JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T (2022)

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Additive manufacturing-A review of hot deformation behavior and constitutive modeling of flow stress

Reza Motallebi et al.

Summary: This article summarizes the significance and application of hot working in additive manufacturing technology, as well as discusses the effects of temperature, strain rate, initial phases, and additive manufacturing processes on the thermomechanical behavior. It also presents experimental models and constitutive equations for hot flow stress, and proposes future research directions and prospects.

CURRENT OPINION IN SOLID STATE & MATERIALS SCIENCE (2022)

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Defects and anomalies in powder bed fusion metal additive manufacturing

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Summary: Metal additive manufacturing is a disruptive technology that revolutionizes the manufacturing industry by directly fabricating complex metal parts. However, microstructural defects and anomalies limit its widespread adoption, potentially compromising the structural integrity and performance of the products. This review aims to explore the common defects/anomalies and their formation mechanisms in powder bed fusion processes, as well as propose practical strategies for mitigating these issues.

CURRENT OPINION IN SOLID STATE & MATERIALS SCIENCE (2022)

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A review of hot deformation behavior and constitutive models to predict flow stress of high-entropy alloys

Zeinab Savaedi et al.

Summary: This review article provides an overview of the hot deformation behavior and constitutive description of flow stress in high entropy alloys (HEAs). The potential of hot working for grain refinement, reduction of casting defects, and enhancement of mechanical properties of HEAs is explained. The effects of processing parameters, alloying elements, dynamic precipitation, and the presence of phases on the hot deformation behavior and restoration processes are discussed. The application of processing maps for characterizing flow instability, cracking, flow softening, and dynamic recrystallization during hot forming of HEAs is presented. Various constitutive models and methods for flow stress modeling and flow curve prediction are assessed. Suggestions for future research works are proposed.

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Review: Multi-principal element alloys by additive manufacturing

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Tailoring the microstructure and mechanical property of additively manufactured AlCrCuFeNi3.0 high-entropy alloy through heat treatment

Shuncun Luo et al.

Summary: The near-eutectic microstructures of AlCrCuFeNi3.0 high-entropy alloy prepared by selective laser melting can be adjusted by heat treatments to achieve desired mechanical properties. The formation of fine near-eutectic lamellar structures and coherent nano-precipitates contributes to the outstanding mechanical properties of the alloy.

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING (2022)

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Homogenization heat treatment for an additively manufactured precipitation-hardening high-entropy alloy

Zhi-Yuan Liu et al.

Summary: In this study, a precipitation-hardening high-entropy alloy was successfully fabricated using selective laser melting. Homogenization heat treatment was used to alleviate Ti segregation and increase grain size, resulting in significantly improved ductility. Pre-homogenization reduced the precipitation of ordered phases and greatly improved the plastic deformation ability of the alloy.

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Summary: This review paper examines the effects of post-processing/finishing operations on additively manufactured materials, focusing on the relationship between different AM technologies and microstructural properties of materials. The study also investigates how post-processing/finishing influences mechanical properties and performance factors such as fatigue, tribology, and corrosion resistance.

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Stabilized sub-grain and nano carbides-driven 1.2GPa grade ultra-strong CrMnFeCoNi high-entropy alloy additively manufactured by laser powder bed fusion

Young-Kyun Kim et al.

Summary: This study investigated a strategy to enhance the strength of selective laser melted carbon-containing high-entropy alloys through microstructure control. After aging treatment, the tensile strength and deformation mechanism of the alloys changed significantly, showing higher strain hardening capacity.

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Beneficial effects of deep cryogenic treatment on mechanical properties of additively manufactured high entropy alloy: cyclic vs single cryogenic cooling

Hongge Li et al.

Summary: Cyclic deep cryogenic treatment (DCT) can effectively homogenize the residual stress and improve the mechanical properties of additively manufactured (AM) metallic materials.

JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY (2022)

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Post-processing heat treatment of lightweight magnesium alloys fabricated by additive manufacturing: a review

Reza Motallebi et al.

Summary: Additive manufactured magnesium alloys have wide applications in the medical and automotive industries. However, the printability of these alloys is challenging and often results in various defects. This overview article critically discusses recent advances in hot isostatic pressing, solution annealing, and aging/precipitation heat treatment for improving the microstructure and mechanical/functional properties of magnesium alloys.

JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T (2022)

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Post-processing of additively manufactured metallic alloys-A review

Amir Malakizadi et al.

Summary: Additive manufacturing has unique advantages but the effects of material properties on post-processing need to be understood. This review focuses on the characteristics of different AM technologies and materials' microstructural properties on mechanical performance.

INTERNATIONAL JOURNAL OF MACHINE TOOLS & MANUFACTURE (2022)

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Review Materials Science, Multidisciplinary

Advances in additive manufacturing of metal-based functionally graded materials

Ashley Reichardt et al.

Summary: Technological advancements in the 2010s have allowed metal additive manufacturing to evolve from a prototyping tool to a widespread manufacturing process. The development of functionally graded materials is a key challenge, involving the adjustment of alloy composition and properties to fabricate bulk, complex geometry materials.

INTERNATIONAL MATERIALS REVIEWS (2021)

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Review Materials Science, Multidisciplinary

Friction stir welding/processing of metals and alloys: A comprehensive review on microstructural evolution

A. Heidarzadeh et al.

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Superplasticity of high-entropy alloys: a review

Reza Motallebi et al.

Summary: High-entropy alloys (HEAs) are a new class of engineering materials with unique mechanical and functional properties. Superplastic forming of HEAs might be a viable route for actual applications of these alloys. This monograph summarized the superplastic behaviors of HEAs and medium-entropy alloys (MEAs), along with reviewing the basics of high-entropy alloys and fine-grained superplasticity.

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Weidong Li et al.

Summary: Research in high-entropy alloys has been booming since the 2010s, focusing on the vast potential in compositions, microstructures, and properties. Efforts are mainly directed towards exploring the compositional space and microstructures, as well as understanding the mechanical behavior. However, there is still a lack of comprehensive studies on the mechanical behavior of high-entropy alloys.

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Phase and structural changes during heat treatment of additive manufactured CrFeCoNi high-entropy alloy

Yulia O. Kuzminova et al.

Summary: The study explores the effects of post-printing heat treatments on the microstructure and phase compositions of an AM CrFeCoNi alloy. Different temperatures lead to varied microstructural changes and property evolutions, demonstrating the excellent phase stability of the AM CrFeCoNi system.

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Review Chemistry, Physical

A focused review on machine learning aided high-throughput methods in high entropy alloy

Ling Qiao et al.

Summary: High-entropy alloys (HEAs) have attracted significant attention in various fields due to their unique microstructures and excellent properties. Machine learning methods can accelerate the discovery of new materials and aid in composition design. The combination of machine learning and multi-scale computation shows great potential in materials science and the future prospects of HEAs.

JOURNAL OF ALLOYS AND COMPOUNDS (2021)

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Effect of hot isostatic pressing on the cryogenic mechanical properties of CrCoNi medium entropy alloy processed by direct energy deposition

Minh Tien Tran et al.

Summary: In this study, the effect of hot isostatic pressing (HIP) on the cryogenic mechanical properties of CrCoNi medium entropy alloy (MEA) fabricated by direct energy deposition (DED) was investigated. The HIP treated CrCoNi MEA-DED showed decreased strength, but an excellent combination of high strength and preserved elongation to fracture at 77 K. The mechanical properties at cryogenic temperature of the HIP treated CrCoNi MEA-DED were significantly better compared to other CrCoNi MEAs prepared by different processes.

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING (2021)

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Microstructure and mechanical properties of AZ31B Mg alloy fabricated by friction stir welding with pulse current

Shujun Chen et al.

Summary: The influence of pulse current on microstructure and mechanical properties of FSW joints was investigated, with an increase in pulse current resulting in enhanced ultimate tensile strength and elongation of EFSW joints. The highest hardness was observed at a pulse current of 300A, with precipitation hardening being the main mechanism for strengthening the joints.

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A perspective on precipitation-hardening high-entropy alloys fabricated by additive manufacturing

Farahnaz Haftlang et al.

Summary: The increasing demand for advanced metallic materials with optimal mechanical properties has led to the development of next-generation materials based on alloying multiple principal elements in high concentrations. High-entropy alloys (HEAs) show great potential for industrial applications due to their exceptional properties under various conditions. Through the use of novel metal additive manufacturing (MAM) techniques, defect-free HEA components with desirable performance can be produced, with unique microstructures providing an optimal strength-ductility relationship even in extreme environments.

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Fatigue behavior of additive manufactured CrFeCoNi medium-entropy alloy

Y. O. Kuzminova et al.

Summary: This paper investigated the fatigue behavior of CrFeCoNi medium-entropy alloys (MEAs) produced by additive manufacturing to extend the understanding of HEA applications, with a focus on evaluating the impact of machining and heat treatment on the fatigue characteristics of the samples.

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Significant transitions of microstructure and mechanical properties in additively manufactured Al-Co-Cr-Fe-Ni high-entropy alloy under heat treatment

Qingkai Shen et al.

Summary: Non-equimolar Al-Co-Cr-Fe-Ni high-entropy alloy was fabricated by CCW-AAM, and the microstructure evolution and mechanical properties after heat treatment at different temperatures were investigated. The hardness and strength of the alloy increased with heat treatment temperature, while the elongation decreased.

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING (2021)

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Influences of Process Parameters on the Microstructure and Mechanical Properties of CoCrFeNiTi Based High-Entropy Alloy in a Laser Powder Bed Fusion Process

Takafumi Ikeda et al.

Summary: This study utilized a laser-based powder bed fusion (LPBF) process to investigate the influences of process parameters on the microstructure and mechanical properties of CoCrFe NiTiMo HEAs. A process map was constructed to optimize the fabrication conditions based on evaluating density and surface roughness. The fabricated specimens at the optimum condition exhibited high relative density, anisotropic microstructure, and superior mechanical properties.

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Improving the hydrogen embrittlement resistance of a selective laser melted high-entropy alloy via modifying the cellular structures

Zhenghong Fu et al.

Summary: This study demonstrates that modifying cellular structures through controlled annealing can effectively improve the hydrogen embrittlement resistance of selective laser melting processed alloys. Annealing preserved cellular structures while reducing dislocation densities, slightly reducing strength but significantly increasing ductility and HE resistance. The delayed crack initiation and propagation were attributed to hydrogen-enhanced local plasticity with formation of nano-twins and dislocation cells in the modified structures.

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Effects of elemental segregation and scanning strategy on the mechanical properties and hot cracking of a selective laser melted FeCoCrNiMn-(N,Si) high entropy alloy

Lin Guo et al.

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MATERIALS TODAY-PROCEEDINGS (2018)

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Article Chemistry, Physical

Evolution of microstructure, mechanical and corrosion properties of AlCoCrFeNi high-entropy alloy prepared by direct laser fabrication

Rui Wang et al.

JOURNAL OF ALLOYS AND COMPOUNDS (2017)

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Article Materials Science, Multidisciplinary

Influence of compressive strain on the microstructural evolution of an AlCoCrFeNi high entropy alloy

Kwang Seok Lee et al.

MATERIALS CHARACTERIZATION (2017)

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Article Materials Science, Multidisciplinary

CoCrFeNiTi-based high-entropy alloy with superior tensile strength and corrosion resistance achieved by a combination of additive manufacturing using selective electron beam melting and solution treatment

Tadashi Fujieda et al.

MATERIALS LETTERS (2017)

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Review Materials Science, Multidisciplinary

A critical review of high entropy alloys and related concepts

D. B. Miracle et al.

ACTA MATERIALIA (2017)

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Article Materials Science, Multidisciplinary

A combinatorial assessment of AlxCrCuFeNi2(0 < x < 1.5) complex concentrated alloys: Microstructure, microhardness, and magnetic properties

T. Borkar et al.

ACTA MATERIALIA (2016)

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Article Nanoscience & Nanotechnology

The use of high-entropy alloys in additive manufacturing

Yevgeni Brif et al.

SCRIPTA MATERIALIA (2015)

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Article Materials Science, Multidisciplinary

Compositionally graded metals: A new frontier of additive manufacturing

Douglas C. Hofmann et al.

JOURNAL OF MATERIALS RESEARCH (2014)

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Review Physics, Multidisciplinary

Physical Properties of High Entropy Alloys

Ming-Hung Tsai

ENTROPY (2013)

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Article Nanoscience & Nanotechnology

Microstructural development in equiatomic multicomponent alloys

B Cantor et al.

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING (2004)

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Article Materials Science, Multidisciplinary

Nanostructured high-entropy alloys with multiple principal elements: Novel alloy design concepts and outcomes

JW Yeh et al.

ADVANCED ENGINEERING MATERIALS (2004)

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