4.7 Article

Effects of tailoring microstructure on short-term creep behavior of high Nb containing TiAl alloys under various stress levels

Related references

Note: Only part of the references are listed.
Article Nanoscience & Nanotechnology

Tensile creep behavior of a heat treated ?-solidified ?-TiAl alloy: The development of dynamic recrystallization and the role of B2 phase

Zhenquan Liang et al.

Summary: The tensile creep behavior of a heat treated beta-solidified gamma-TiAl alloy was investigated at 800 degrees C and 250-300 MPa. The heat treatment improved the creep resistance of the alloy. Creep deformation is dominated by viscous dislocation glide and assisted by mechanical twinning. Twin boundary and TiB hinder dislocation movement and strengthen creep resistance. Dynamic recrystallization and B2 phase precipitation occur during creep. Creep voids prefer to nucleate at the gamma-B2 and B2-colony interfaces, leading to brittle-ductile mixed fracture.

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING (2023)

Article Materials Science, Multidisciplinary

Creep behavior and related phase precipitation of a creep-resistant Y2O3-bearing high Nb containing TiAl alloy

Zhenquan Liang et al.

Summary: A creep-resistant Ti-45Al-6Nb-2.5V-0.15Y2O3 alloy was studied at different creep stages. It was found that the creep deformation of this alloy is influenced by dislocation slip, climb of gamma phase, and alpha 2 phase due to the activation of a slip system. The interactions among dislocation, twin boundary, and Y2O3 particle cause creep hardening, while dynamic recrystallization softens the alloy. Surface and bulk damage caused by oxidation and void nucleation increase the creep rate until fracture. Additionally, TiAl2 phases nucleate and grow during creep, maintaining a small planar disregistry with the gamma matrix.

MATERIALS CHARACTERIZATION (2023)

Article Materials Science, Multidisciplinary

Evading the strength-ductility trade-off at room temperature and achieving ultrahigh plasticity at 800°C in a TiAl alloy

Guoming Zheng et al.

Summary: This study developed two new microstructures, T-T and T-D structures, in the Ti-43.5Al-4Nb-1Mo-0.18 (TNM) alloy, which significantly improved the alloy's strength and ductility. The formation of deformation twins and the promotion of dynamic recrystallization were found to play important roles in enhancing the plasticity at both room temperature and elevated temperatures.

ACTA MATERIALIA (2022)

Article Nanoscience & Nanotechnology

Grain boundaries with high Σ value and strain in grain matrix induce crack initiation in extruded 6000 series aluminium alloys

Shogo Oda et al.

Summary: The bending properties of 6000 series Al alloys are influenced by various factors, including precipitates, shear band generation, preferred orientation, and residual stress distribution. The energetic stability of grain boundaries and grain matrix plays a crucial role in crack initiation mechanisms, with unstable grain boundaries with a large Sigma value being more prone to cracking.

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

Article Nanoscience & Nanotechnology

Microstructure and mechanical properties of Y2O3-bearing Ti-48Al-2Cr-2Nb alloy prepared by selective electron beam melting

Hangyu Yue et al.

Summary: The effects of beam speed on the microstructure, defects, and mechanical properties of Ti-48Al-2Cr-2Nb alloy with nano-Y2O3 addition were studied. The orientation relationship between nano-Y2O3 and the matrix was determined. The Y2O3-bearing TiAl alloys exhibited excellent compressive properties at room temperature, showing potential for applications.

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

Article Materials Science, Multidisciplinary

Quasi-in-situ investigation on microstructure degradation of a fully lamellar TiAl alloy during creep

Yichao Wang et al.

Summary: The microstructure degradation of a fully lamellar TNM alloy during creep was investigated. The results showed that the fully lamellar structure exhibited gradual degradation during creep, with dynamic recrystallization and phase transformation occurring in the primary creep region, obstacles provided by fine clusters affecting dislocation movement in the steady-state creep region, and cavity formation and lamellar structure damage in the tertiary creep region.

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

Article Chemistry, Physical

Enhanced high temperature tensile and creep properties of a ?-solidified ?-TiAl alloy with the hybrid addition of C and Y2O3 br

Zhenquan Liang et al.

Summary: A hybrid reinforced beta-solidified gamma-TiAl alloy was successfully developed through the addition of C and Y2O3, which improved its high temperature tensile strength and creep resistance. The alloy's creep resistance was significantly enhanced due to multiple strengthening mechanisms, including the second phase strengthening and the special obstacles to dislocation movement provided by mechanical twins and twin intersections.

INTERMETALLICS (2022)

Article Nanoscience & Nanotechnology

Refining Ti2AlC particles and improvement of microstructure and mechanical properties on Ti46Al8Nb2.6C alloy by Er addition

Hongze Fang et al.

Summary: The refinement mechanism of Ti2AlC particles and lamellae colony by Er and the strengthening mechanism of TiAl composites were revealed. The results showed that Er2O3 particles limited atomic spreading and layered superposition of Ti2AlC, resulting in the refinement of Ti2AlC particles. The compressive strength and strain increased with the increase of Er content, and the Vickers hardness also increased. Thus, Er contributed significantly to the improvement of compressive strength in TiAl composites.

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

Article Materials Science, Multidisciplinary

The influence of stress levels on the creep behavior of Ti-42Al-6Nb-0.05Y2O3 alloy

Yingfei Guo et al.

Summary: The paper investigates the creep behavior of Ti-42Al-6Nb-0.05Y(2)O(3) alloy. The stress exponent varies with creep stress and the dominant creep mechanisms differ at different stress levels. Inter-granular cracks and nucleation of cracks along lamellar interfaces contribute to the failure at high and low stress, respectively. The activation energy transition temperature (AETT) and the role of dislocation movements are also discussed.

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

Article Nanoscience & Nanotechnology

Effect of Al content on the microstructure and mechanical properties of gamma-TiAl alloy fabricated by twin-wire plasma arc additive manufacturing system

Lin Wang et al.

Summary: TiAl alloys with different Al content were successfully fabricated using an innovative twin-wire plasma arc additive manufacturing system in this study. The research investigated the effect of Al level on phase composition, microstructure characteristics, microhardness, and tensile properties of the alloys. It was found that decreasing Al content led to increased alpha(2) phase content, reduced tetragonal ratio c/a of the gamma phase, decreased lamellar spacing, and increased microhardness. The Ti-48 Al (at.%) alloy demonstrated superior tensile properties due to optimal microstructure characteristics.

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

Article Materials Science, Multidisciplinary

Influence of Process Conditions on the Local Solidification and Microstructure During Laser Metal Deposition of an Intermetallic TiAl Alloy (GE4822)

Silja-Katharina Rittinghaus et al.

Summary: Temperature-time cycles are essential for the formation of microstructures and mechanical properties of materials, especially in additive manufacturing. Preheating is used to prevent cracking in brittle materials like titanium aluminides. The study investigates solidification conditions during the additive manufacturing process of Ti-48Al-2Cr-2Nb and observes influences on both chemical composition and microstructure, which can be balanced through post heat treatment.

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE (2021)

Article Nanoscience & Nanotechnology

A β-solidifying TiAl alloy reinforced with ultra-fine Y-rich precipitates

Xu Gu et al.

Summary: The spark plasma sintered TiAl alloy exhibited a refined microstructure with uniform distribution of ultra-fine yttrium-rich precipitates, resulting in excellent tensile properties at room temperature.

SCRIPTA MATERIALIA (2021)

Article Metallurgy & Metallurgical Engineering

Effect of carbon addition on creep behavior of cast TiAl alloy with hard-oriented directional lamellar microstructure

Xi-wen Zhang et al.

JOURNAL OF IRON AND STEEL RESEARCH INTERNATIONAL (2020)

Article Nanoscience & Nanotechnology

Influence of nano-Y2O3 addition on microstructure and tensile properties of high-Al TiAl alloys

Yingfei Guo et al.

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING (2020)

Article Materials Science, Multidisciplinary

Advances in Gammalloy Materials-Processes-Application Technology: Successes, Dilemmas, and Future

Young-Won Kim et al.

Article Materials Science, Multidisciplinary

Mechanical properties, deformation behavior and microstructure evolution of Ti-43Al-6Nb-1Mo-1Cr alloys

Mingao Li et al.

MATERIALS CHARACTERIZATION (2018)

Article Nanoscience & Nanotechnology

Effects of lamellar spacing on microstructural stability and creep properties in β-solidifying γ-TiAl alloy by directional solidification

Qi Wang et al.

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING (2018)

Article Nanoscience & Nanotechnology

The effect of boron addition on the high-temperature properties and microstructure evolution of high Nb containing TiAl alloys

Mingao Li et al.

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING (2018)

Article Materials Science, Multidisciplinary

Understanding the role of carbon atoms on microstructure and phase transformation of high Nb containing TiAl alloys

Zeen Wu et al.

MATERIALS CHARACTERIZATION (2017)

Article Materials Science, Multidisciplinary

Design and control of microstructure and texture by thermomechanical processing of a multi-phase TiAl alloy

Petra Erdely et al.

MATERIALS & DESIGN (2017)

Article Materials Science, Multidisciplinary

Intermetallic titanium aluminides in aerospace applications - processing, microstructure and properties

Helmut Clemens et al.

MATERIALS AT HIGH TEMPERATURES (2016)

Article Chemistry, Physical

Polysynthetic twinned TiAl single crystals for high-temperature applications

Guang Chen et al.

NATURE MATERIALS (2016)

Article Chemistry, Physical

Influence of cooling rate on microstructure formation during rapid solidification of binary TiAl alloys

C. Kenel et al.

JOURNAL OF ALLOYS AND COMPOUNDS (2015)

Article Chemistry, Physical

Investigations on processing powder metallurgical high-Nb TiAl alloy sheets

Yong Liu et al.

INTERMETALLICS (2014)

Review Materials Science, Multidisciplinary

Design, Processing, Microstructure, Properties, and Applications of Advanced Intermetallic TiAl Alloys

Helmut Clemens et al.

ADVANCED ENGINEERING MATERIALS (2013)

Article Materials Science, Multidisciplinary

Microstructural control of TiAl-Nb alloys by directional solidification

X. F. Ding et al.

ACTA MATERIALIA (2012)

Article Nanoscience & Nanotechnology

Orientation gradients and geometrically necessary dislocations in ultrafine grained dual-phase steels studied by 2D and 3D EBSD

Marion Calcagnotto et al.

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING (2010)

Article Chemistry, Physical

Micro segregation in high Nb containing TiAl alloy ingots beyond laboratory scale

G. L. Chen et al.

INTERMETALLICS (2007)

Article Materials Science, Multidisciplinary

Microstructural development during directional solidification of α-seeded TiAl alloys

DR Johnson et al.

ACTA MATERIALIA (2006)

Article Chemistry, Physical

Review of alloy and process development of TiAl alloys

Xinhua Wu

INTERMETALLICS (2006)