Effects of rolling deformation on microstructure and hardness of Ti-45Al-9Nb-0.3Y alloy
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- 作者：Shuzhi ZHANG ((张树志))a ; b ; zhshzh1984@163.com" class="auth_mail" title="E-mail the corresponding author ; Changjiang ZHANG ((张长江))a ; b ; Zhaoping HOU ((侯赵平))a ; Fantao KONG ((孔凡涛))c ; Yuyong CHEN ((陈玉勇))c
- 关键词：high Nb containing TiAl based alloy ; TNB alloy ; hot rolling ; omega phase ; phase transformation ; nanohardness ; rare earths
- 刊名：Journal of Rare Earths
- 出版年：2016
- 出版时间：February 2016
- 年：2016
- 卷：34
- 期：2
- 页码：197-202
- 全文大小：816 K
文摘
The microstructure evolution of as-rolled Ti-45Al-9Nb-0.3Y alloy as well as the nanohardness of β/B2 matrix was investigated by means of scanning electron microscopy (SEM) in backscattered electron mode (BSE) mode, transmission electron microscopy (TEM) and nanoindentation. This high Nb containing TiAl based alloy was rolled with 50%, 60%, 65% reduction, respectively. Omega phase precipitated in B2 phase with an orientation relationship of {110}β//{11
0}ω and <11>β//<0001>ω. Moreover, with the increase of deformation reduction, rod-like structure which was formed in γ grain transformed from (α2+γ) lamellae structure into α2 phase only. Additionally, nanoinentation experiment revealed that the precipitation hardening of ω phase increased the hardness of β/B2 phase.
0}ω and <11>β//<0001>ω. Moreover, with the increase of deformation reduction, rod-like structure which was formed in γ grain transformed from (α2+γ) lamellae structure into α2 phase only. Additionally, nanoinentation experiment revealed that the precipitation hardening of ω phase increased the hardness of β/B2 phase.