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

Published online by Cambridge University Press:  26 February 2011

Ryutaro Shimizu ,
Kei Masumoto ,
Yusuke Fukui ,
Tomonari Inamura ,
Kenji Wakashima ,
Hideki Hosoda  and
Shuichi Miyazaki
Ryutaro Shimizu
Affiliation:
ryutaro@ken.pi.titech.ac.jp, Tokyo Institute of Technology, Precision and Intelligence Laboratory, 4259 Nagatsuta, Midori-ku, Yokohama, 226-8503, Japan
Kei Masumoto
Affiliation:
k-masumoto@ken.pi.titech.ac.jp, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama, 226-8503, Japan
Yusuke Fukui
Affiliation:
fukui@ken.pi.titech.ac.jp, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama, 226-8503, Japan
Tomonari Inamura
Affiliation:
inamura.t.aa@m.titech.ac.jp, Tokyo Institute of Technology, Precision and Intelligence Laboratory, 4259 Nagatsuta, Midori-ku, Yokohama, 226-8503, Japan
Kenji Wakashima
Affiliation:
wakashima.k.aa@m.titech.ac.jp, Tokyo Institute of Technology, Precision and Intelligence Laboratory, 4259 Nagatsuta, Midori-ku, Yokohama, 226-8503, Japan
Hideki Hosoda
Affiliation:
hosoda.h.aa@m.titech.ac.jp, Tokyo Institute of Technology, Precision and Intelligence Laboratory, 4259 Nagatsuta, Midori-ku, Yokohama, 226-8503, Japan
Shuichi Miyazaki
Affiliation:
miyazaki@ims.tsukuba.ac.jp, University of Tsukuba, Institute of Materials Science, Tennodai 1-1-1, Tsukuba, Ibaraki, 305-8573, Japan
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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.

Keywords

textureTicompound
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 980: Symposium II – Advanced Intermetallic-Based Alloys , 2006 , 0980-II05-50
Copyright
Copyright © Materials Research Society 2007

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References

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