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Effect of Ti3Si on Texture in Ti-Nb Based Shape Memory Alloys

  • Ryutaro Shimizu (a1), Kei Masumoto (a2), Yusuke Fukui (a3), Tomonari Inamura (a4), Kenji Wakashima (a5), Hideki Hosoda (a6) and Shuichi Miyazaki (a7)...

Abstract

Effect of Ti3Si particles on recrystallization texture of Ti-Nb based superelastic alloys has been investigated using X-ray pole figure measurement and electron backscatter diffraction (EBSD) technique. The alloys used were Ti-24mol%Nb-3mol%Al-Xmol%Si (X=0~0.9, termed XSi) and Ti-24mol%Nb-3mol%Si alloy (termed 3Si). The apparent phase at room temperature was β-phase (bcc). Besides, (Ti, Nb)3Si particles with PTi3 type crystal structure were formed in the alloys with Si content higher than 0.7mol%. After the cold rolling of 99% reduction in thickness, a rolling texture of the β-phase was formed to be mainly {001}β<110>β regardless of the presence of the (Ti, Nb)3Si particles. After the solution treatment at 1273K, a recrystallization texture formed to be {112}β<110>β in all the alloys except for 3Si. The average grain size of the recrystallized alloys was 20~40μm. On the other hand, the solution treated 3Si exhibited the {001}β<110>βn texture and the average grain size of 3μm. It is concluded that the {001}β<110>β texture with fine grains of the solution treated 3Si is obtained by the suppression of grain boundary migration due to the existence of the (Ti, Nb)3Si particles.

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Effect of Ti3Si on Texture in Ti-Nb Based Shape Memory Alloys

  • Ryutaro Shimizu (a1), Kei Masumoto (a2), Yusuke Fukui (a3), Tomonari Inamura (a4), Kenji Wakashima (a5), Hideki Hosoda (a6) and Shuichi Miyazaki (a7)...

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