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Article
Materials Science, Multidisciplinary
Junha Yang et al.
Summary: This study evaluated the fracture toughness of a metastable alloy at room and cryogenic temperatures and investigated the effects of deformation-induced martensitic transformation (DIMT) on fracture behavior. The results showed that high fracture toughness and ductile fracture mode were observed at room temperature, but the fracture toughness significantly decreased at cryogenic temperature. The morphology of the martensite had an impact on the fracture behavior, with the plate-type BCC martensite exhibiting lower toughness and brittle fracture mode compared to the lath-type BCC martensite.
Article
Materials Science, Multidisciplinary
Jiaojiao Yi et al.
Summary: A lightweight, refractory high entropy alloy CrNbTa0.25TiZr was prepared by arc-melting under vacuum, with as-cast and annealed samples showing improvement in yield strength and lower density compared to a reference alloy. The evolution of the microstructure highlights the promising strength of CrNbTa0.25TiZr.
METALS AND MATERIALS INTERNATIONAL
(2022)
Article
Chemistry, Physical
Sang Hun Shim et al.
Summary: The addition of nitrogen significantly affects the microstructural evolution and mechanical properties of CoCrFeMnNi alloys, suppressing grain growth and enhancing alloy performance. It results in excellent tensile strength and elongation with substantial strain hardening, showing strong temperature dependence in yield strength likely due to friction stress induced by temperature-dependent obstacles.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Xuehui Yan et al.
Summary: Extraordinary strength and good tensile ductility are achieved in (Zr0.5Ti0.35Nb0.15)(100-x)Al-x alloys at room temperature. The relatively low densities exhibited in these alloys make them attractive structural materials. Designing nanoprecipitates and diversifying dislocation motions play key roles in achieving such breakthrough.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Farahnaz Haftlang et al.
Summary: In this study, the tribological performance of V10Cr10Fe45Co30Ni5 high entropy alloy (HEA) was investigated, and its relationship with the subsurface deformed area and the superficial tribo-layer were explored. The results showed that the surface and subsurface structures of the alloy changed with the applied load, leading to enhanced hardness and the formation of a protective tribo-oxide layer.
MATERIALS & DESIGN
(2022)
Article
Nanoscience & Nanotechnology
E. Povolyaeva et al.
Summary: A new medium-entropy Fe-65(CoNi)(25)Cr9.5C0.5 alloy was investigated for its properties at room and liquid nitrogen temperatures. The alloy exhibited high strength, good ductility, and excellent fracture toughness at cryogenic temperatures. The microstructure analysis suggested a phase transition induced by deformation, and the cold-rolled alloy showed improved mechanical properties compared to the as-cast alloy. Substructure strengthening, interphase strengthening, and solid solution strengthening were identified as contributing factors to the alloy's enhanced performance.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
Chen Chen et al.
Summary: In this paper, a novel Fe49.85Cr10.03Mn10.03Co10.03Ni10.03Al10.03 high entropy alloy with dual-phase fine grain structure was designed and fabricated by arc-melting. The microstructure, as well as the mechanical properties at room temperature and cryogenic temperature, were investigated. The results showed that the as cast Fe-based HEA consisted of FCC and BCC phases, and the stick-like FCC fine grains were derived from solid-state phase transformation of BCC phase during cooling. Additionally, the alloy exhibited similar tensile strength and good plasticity at both room temperature and cryogenic temperature, indicating high mechanical properties over a wide range of temperatures. This work provides a novel route for designing high-performance fine-grain HEAs without mechanical/heat treatment and contributes to the further development of HEAs.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Yi Li et al.
Summary: This study comparatively investigates the deformation mechanisms of an Al19Co20Fe20Ni41 EHEA at different temperatures, revealing the high frequency and density of dislocation multi-slip scenario in the soft eutectic lamellae and the corresponding compatible co-deformation in the adjacent hard lamellae. These mechanisms contribute to the strong hetero-deformation-induced (HDI) hardening and excellent cryogenic properties of the material.
MATERIALS RESEARCH LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Guanghui Yang et al.
Summary: The annealing time-dependence microstructures and deformation mechanisms of the novel face-centered cubic Fe49.5Mn30Co10Cr10C0.2Ti0.1V0.1 Mou HEA are reported in this study. Three types of precipitates, sigma-phase, Cr-rich MC-type carbides, and nano-scale (Ti, V, Mo)C, are present after cold-rolling and annealing. The hierarchical precipitates can lead to sluggish recrystallization and grain growth. The deformation mechanisms change with annealing time, with dislocation glide, deformation twinning, and deformation-induced epsilon phase observed for short annealing times, and a more complex transformation for longer annealing times. The material annealed for 10 hours shows superior strain hardening capacity and strength-ductility combination.
Article
Chemistry, Physical
Peng Wang et al.
Summary: Recent advances in experiments have demonstrated that the newly synthesized dual-phase high-entropy alloys (DP-HEAs) possess ultrahigh ductility while maintaining high strength. In this work, the nucleation mechanisms of martensite in DP-HEA have been thoroughly investigated using molecular dynamics (MD) simulations. The results reveal that the nucleation of martensite is controlled by localized stress levels and strain energies. These findings provide fundamental insights into the strengthening and toughening mechanisms of DP-HEA and have implications for the design of new alloys.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Farahnaz Haftlang et al.
Summary: In this study, the cryogenic tensile properties of a metastable medium entropy alloy (MEA) and the impact of transformation-induced plasticity on the strength-ductility synergy were investigated. The results showed that the as-annealed specimen exhibited excellent mechanical strength and ductility due to the high strain-hardening rate. Numerical analysis provided insights into the strain distribution and its correlation with the martensitic fraction, contributing to the development of improved ferrous MEAs/HEAs.
JOURNAL OF MATERIALS SCIENCE
(2022)
Article
Multidisciplinary Sciences
Jie Ren et al.
Summary: Through laser powder bed fusion, we have successfully printed dual-phase nanolamellar high-entropy alloys with high yield strength and large uniform elongation. The high yield strength is attributed to the dual-phase structure consisting of alternating face-centred cubic and body-centred cubic nanolamellae, while the large tensile ductility arises from the high work-hardening capability of the dual-phase nanolamellae embedded in microscale eutectic colonies.
Article
Chemistry, Physical
Ran Wei et al.
Summary: This study investigated the microstructure, mechanical properties, and corrosion resistance of Fe50Mn25Cr15Ni10-xCox medium-entropy alloys. The results showed that the microstructure and properties of the alloys changed with increasing Co concentration, affecting their mechanical strength, ductility, and corrosion resistance.
Article
Materials Science, Multidisciplinary
Zhen Chen et al.
Summary: In this study, a new medium-entropy alloy with a face-centered cubic/hexagonal close-packed (FCC/HCP) dual-phase ultrafine-grained (UFG) architecture was proposed to achieve high ductility in high-strength materials. The alloy exhibited an ultrahigh yield strength and uniform elongation at ambient temperature, attributed to the fine grain strengthening of the UFG FCC matrix and the function of deformation-induced stacking faults (SFs) in eliminating stress concentration. This work provides new guidance for upgrading the mechanical properties of metallic materials through engineering novel composition and stable UFG structure.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Nanoscience & Nanotechnology
Nima Haghdadi et al.
Summary: Fluctuations in energy distribution during additive manufacturing can result in thermal transients, particularly in alloys. In this study, the complexities in a duplex stainless steel during laser powder bed fusion were investigated. The formation of Ni-Mn-Si rich phase at grain boundaries and local fluctuation in Cr and Fe concentrations were observed, providing precursors for Cr2N formation. These phases were attributed to severe thermal gyrations and thermal stresses associated with laser powder bed fusion.
SCRIPTA MATERIALIA
(2022)
Article
Nanoscience & Nanotechnology
C. Zhang et al.
Summary: The aging process significantly affects the mechanical properties of maraging stainless steel due to the interaction between intermetallic compounds and dislocations. The precipitates formed at different aging temperatures have distinct effects on the strength and toughness of the material. The growth and coarsening of Ni-3(Ti, Al) precipitates, as well as the increase in reverted austenite, play critical roles in determining the mechanical properties of the material over a wide temperature range.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Dae Cheol Yang et al.
Summary: Multi-principal element alloys show outstanding strength and toughness at cryogenic temperatures, attributed to the occurrence of deformation twins and a reduced stacking fault energy. The high-strength VCoNi alloy is expected to exhibit notable cryogenic properties. The effects of cryogenic temperature on tensile and impact properties are investigated, revealing temperature dependence of yield strength and deformation mechanism.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Farahnaz Haftlang et al.
Summary: In this study, the mechanical properties of a newly developed Fe-Ni-Co-Mn-Ti-Si medium-entropy alloy with heterogeneous microstructure were investigated. The alloy exhibited high yield strength, high ultimate tensile strength, and good ductility due to hetero-deformation-induced strengthening and high plastic-incompatibility between mechanically induced-martensite and the austenitic matrix.
Article
Materials Science, Multidisciplinary
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.
MATERIALS & DESIGN
(2021)
Article
Nanoscience & Nanotechnology
Chengbin Wei et al.
Summary: The non-equiatomic Co29Cr29Fe29Ni12.5W0.5 high-entropy alloy exhibited exceptional strength-ductility synergy at cryogenic temperatures, with significant increase in yield strength and outstanding ductility. The microstructure transformed to a hexagonal-close packed phase at low temperatures, contributing to the high mechanical properties observed.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Honglin Zhang et al.
Summary: A novel heat treatment route is proposed to develop a high-strength, high-cryogenic-toughness maraging steel with an ultrafine-grained martensite and austenite dual-phase microstructure. This dual-phase microstructure significantly increases the cryogenic impact energy while maintaining high yield strength. The steel with a large volume fraction of ultrafine-grained austenite exhibits comparable yield strength to conventional maraging steel, thanks to intensive nanoprecipitates in both martensite and austenite phases.
Article
Materials Science, Multidisciplinary
Yong Dong et al.
Summary: The Al0.6CoCrFeNi2Mo0.08V0.04 high-entropy alloy exhibited dendritic and inter-dendritic microstructure and showed excellent strength-ductility synergy at both room and cryogenic temperatures. As the temperature decreased, the alloy demonstrated improved yield strength, fracture strength, and elongation, with the maximum yield strength reaching 560 MPa at -196 degrees C and an elongation exceeding 42%. The fracture mechanism mainly involved dimple-type ductile fracture.
Article
Nanoscience & Nanotechnology
Farahnaz Haftlang et al.
Summary: The mechanical properties of a newly developed metastable 65Fe-15Ni-8Co-8Mn-3Ti-Si ferrous medium-entropy alloy were significantly enhanced after short time annealing and aging treatment, showing high yield strength and total elongation at 298K and 77K. This improvement is attributed to synergistic strengthening mechanisms and the contribution of nano-scale precipitates during tensile deformation.
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