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000645087 1001_ $$0P:(DE-H253)PIP1083767$$aLiu, Shen$$b0
000645087 245__ $$aIn-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
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000645087 520__ $$aDue to their exceptional properties, γ-TiAl based alloys present substantial prospect for aerospace and automotiveapplications. However, the significant disparity in plasticity between the D019-α2 and L10-γ phases greatlyaffects TiAl alloys’ service behavior. This study investigates the internal strain accumulation in the α2 and γphases of an extruded Ti-45Al-8Nb-0.2C alloy during compression at 900 ◦C and the subsequent stress relaxationbehavior during annealing at 850 ◦C, using in situ synchrotron high-energy X-ray diffraction (HEXRD). Duringcompression, the γ phase starts to yield plastically at approximately 410 MPa true stress, progressively shiftingthe load to the α2 phase and generating high residual stress in the α2 phase after deformation. However,annealing at 850 ◦C for 30 min only partially relieves the residual stress in the α2 phase, with the relaxation ratedecreasing substantially after the first 10 min. Furthermore, when the true stress reaches 790 MPa duringcompression, the α2 phase undergoes rigid-body rotation to accommodate the plastic deformation of the adjacentγ phase, initiating texture evolution that ultimately forms a distinct < 1120 > fiber texture.
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000645087 7001_ $$aLiu, Xu$$b1
000645087 7001_ $$0P:(DE-HGF)0$$aWu, Qiaohan$$b2
000645087 7001_ $$0P:(DE-HGF)0$$aLi, Yixuan$$b3
000645087 7001_ $$0P:(DE-HGF)0$$aShi, Qiuyi$$b4
000645087 7001_ $$0P:(DE-H253)PIP1083500$$aSong, Lin$$b5$$eCorresponding author
000645087 7001_ $$0P:(DE-H253)PIP1013067$$aPyczak, Florian$$b6
000645087 7001_ $$0P:(DE-H253)PIP1011120$$aStark, Andreas$$b7
000645087 7001_ $$0P:(DE-HGF)0$$aLi, Xiaobing$$b8
000645087 7001_ $$0P:(DE-HGF)0$$aZhang, Tiebang$$b9
000645087 773__ $$0PERI:(DE-600)1491951-5$$a10.1016/j.matchar.2025.115746$$gVol. 230, p. 115746 -$$p115746$$tMaterials characterization$$v230$$x1044-5803$$y2025
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000645087 8564_ $$uhttps://bib-pubdb1.desy.de/record/645087/files/In-situ%20synchrotron%20high%20energy%20X-ray%20diffraction%20study%20on%20the%20internal%20strain%20evolution%20of%20an%20extruded%20Ti-45Al-8Nb-0.2C%20alloy%20during%20high-temperature%20compression-accepted%20version.pdf$$yPublished on 2025-12-01. Available in OpenAccess from 2026-12-01.
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