Creep behaviour of two-phase lamellar TiAl: Crystal plasticity modelling and analysis

Ilyas, Muhammad Umer; Kabir, Mohammad Rizviul

doi:10.1016/j.intermet.2021.107129

Cited by 13 publications

(1 citation statement)

References 46 publications

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“…In fatigue and creep experiments of the TiAl alloys below the T eu , the pressure can significantly accelerate the service decomposition of the α 2 phase. The α 2 → γ phase transformation occurs in traditional the TiAl alloys in different service conditions, but the morphological and orientation relationship characteristics of these phase transformations are considerably different in different modes [ 27 , 28 , 29 , 30 ]. There are few studies on the microstructure instability and phase transformation of the TiAl alloy with high-stress stored energy at service temperature.…”

Section: Introductionmentioning

confidence: 99%

Microstructure Evolution of the Ti-46Al-8Nb-2.5V Alloy during Hot Compression and Subsequent Annealing at 900 °C

Cao,

Li,

et al. 2023

Materials

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TiAl alloys are high-temperature structural materials with excellent comprehensive properties, and their ideal service temperature range is about 700–950 °C. High-Nb containing the Ti-46Al-8Nb-2.5V alloy was subjected to hot compression and subsequent annealing at 900 °C. During hot compression, work-hardening and strain-softening occurred. The peak stresses during compression are positively correlated with the compressive strain rates and negatively correlated with the compression temperatures. The α2 phase exhibited a typical (0001)α2 basal plane texture after hot compression, while the β0 and γ phases did not show a typical strong texture. Subsequent annealing at 900 °C of the hot-compressed samples resulted in significant phase transformations, specifically the α2 → γ and β0 → γ phase transformations. After 30 min of annealing, the volume fraction of the α2 phase decreased from 39.0% to 4.6%. The microstructure characteristics and phase fraction after 60 min of annealing were similar to those after 30 min. According to the calculation of Miller indexes and texture evolution during annealing, the α2 → γ phase transformation did not follow the Blackburn orientation relationship. Multiple crystal-oriented α2 phases with nanoscale widths (20~100 nm) precipitate within the γ phase during the annealing process, which means the occurrence of γ → α2 phase transformation. Still, the γ → α2 phase transformation follows the Blackburn orientation relationship.

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