Microstructure and compressive properties of directionally solidified Er-bearing TiAl alloy using cold crucible
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- 作者：Qiang Wang ; Hongsheng Ding ; dinghsh@hit.edu.cn" class="auth_mail" title="E-mail the corresponding author ; Hailong Zhang ; Shiqiu Liu ; Ruirun Chen ; Jingjie Guo ; Hengzhi Fu
- 关键词：γ-TiAl alloy ; Er-bearing ; Directional solidification ; Dislocation ; Work hardening capacity
- 刊名：Materials & Design
- 出版年：2016
- 出版时间：5 June 2016
- 年：2016
- 卷：99
- 期：Complete
- 页码：10-20
- 全文大小：2492 K
文摘
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Directionally solidified grains and lamellar laths are both refined significantly by erbium additive in TiAl alloy.
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Oxygen dissolved in the TiAl matrix decreased from 940 ppm to 560 ppm by internally oxidizing of erbium.
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Less oxygen results in lower stacking fault energy of h.c.p. phase (α) and promotes thin γ laths.
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Work hardening capacity is improved with 0.2 at.% erbium additive at strain rate of 10− 1–10− 3 s− 1.