Journal Article

PUBDB-2026-00592

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png In-situ synchrotron high energy X-ray diffraction study on the internal strain evolution of an extruded Ti-45Al-8Nb-0.2C alloy during high-temperature compression

Liu, S.Extern* ; Liu, X. ; Wu, Q. ; Li, Y. ; Shi, Q. ; Song, L. (Corresponding author)Extern* ; Pyczak, F.Extern* ; Stark, A.Extern*Hereon* ; Li, X. ; Zhang, T.

2025
Science Direct New York, NY

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Please use a persistent id in citations: doi:10.1016/j.matchar.2025.115746  doi:10.3204/PUBDB-2026-00592

Abstract: Due to their exceptional properties, γ-TiAl based alloys present substantial prospect for aerospace and automotiveapplications. However, the significant disparity in plasticity between the D019-α2 and L10-γ phases greatlyaffects TiAl alloys’ service behavior. This study investigates the internal strain accumulation in the α2 and γphases of an extruded Ti-45Al-8Nb-0.2C alloy during compression at 900 ◦C and the subsequent stress relaxationbehavior during annealing at 850 ◦C, using in situ synchrotron high-energy X-ray diffraction (HEXRD). Duringcompression, the γ phase starts to yield plastically at approximately 410 MPa true stress, progressively shiftingthe load to the α2 phase and generating high residual stress in the α2 phase after deformation. However,annealing at 850 ◦C for 30 min only partially relieves the residual stress in the α2 phase, with the relaxation ratedecreasing substantially after the first 10 min. Furthermore, when the true stress reaches 790 MPa duringcompression, the α2 phase undergoes rigid-body rotation to accommodate the plastic deformation of the adjacentγ phase, initiating texture evolution that ultimately forms a distinct < 1120 > fiber texture.

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Contributing Institute(s):

1. DOOR-User (DOOR ; HAS-User)
2. Helmholtz-Zentrum Hereon (Hereon)

Research Program(s):

1. 6G3 - PETRA III (DESY) (POF4-6G3) (POF4-6G3)

Experiment(s):

1. PETRA Beamline P07 (PETRA III)

Appears in the scientific report 2025

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Engineering, Computing and Technology ; Ebsco Academic Search ; Essential Science Indicators ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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