Microstructure and compressive properties of directionally solidified Er-bearing TiAl alloy using cold crucible
Microstructure and compressive properties of directionally solidified Er-bearing TiAl alloy using cold crucible
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冷坩埚定向凝固含铒TiAl合金的显微组织和压缩性能
DOI：
10.1016/j.matdes.2016.03.042
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发表时间：
2016-06
影响因子：
8.4
通讯作者：
Hengzhi Fu
中科院分区：
文献类型：
--
作者：
Qiang Wang;Hongsheng Ding;Hailong Zhang;Shiqiu Liu;Ruirun Chen;Jingjie Guo;Hengzhi Fu
采用电磁冷坩埚定向凝固技术，对Ti-47 Al-2Nb-2Cr双相γ-TiAl合金进行了Er合金化。通过压缩试验，根据铒添加量对合金微观组织的影响，确定了合金的加工硬化能力。定向凝固的柱状晶细化了0.2at.%在0.8at.%的情况下发生柱状晶向等轴晶的转变（CET铒。由于氧对铒具有极强的亲合力，所以通过铒的内部氧化，溶解在TiAl基体中的氧从940 ppm减少到560 ppm。扫描电子显微镜（SEM）表征表明，Er 2 O3颗粒均匀地分散在（α 2+ γ）层中。由于基体中间隙氧的损失，hcp相（α 2或α）的层错能降低，导致γ形核位置增加。然后在含Er合金中细化γ相。在压缩试验过程中，0.2at.%在应变速率ε为10− 1-10− 3 s− 1时，含Er合金的性能得到改善，拟合公式为Hc = 1.66 ε今− 0.05。此外，应变速率敏感性结果表明，含Er TiAl合金的变形机制与不含Er的TiAl合金相同。
Dual phase γ-TiAl of Ti-47Al-2Nb-2Cr was alloyed by erbium and then prepared by directional solidification using electromagnetic cold crucible. Compression test was performed to determine the work hardening capacity in accordance with microstructures regarding erbium additions. The directionally solidified columnar grains were refined by 0.2 at.% erbium in comparison to those without erbium, while columnar to equiaxed transition (CET) happened in the case of 0.8 at.% erbium. Since oxygen has extremely strong affinity to erbium, oxygen dissolved in the TiAl matrix decreased from 940 ppm to 560 ppm by internally oxidizing of erbium. The scanning electron microscopy characterization revealed that the Er 2 O 3 particles were dispersed uniformly in the (α 2+ γ) lamellae. Arising from the loss of interstitial oxygen in the matrix, stacking fault energy of the hcp phase (α 2 or α) was decreased which resulted in increasing nucleation sites of γ phase. Then the γ lamellae were refined in the Er-bearing alloys. During the compression test, the work hardening capacity (H c) of the 0.2 at.% Er-bearing alloy was improved at strain rate ε ̇ of 10− 1–10− 3 s− 1, which could be fitted as H c= 1.66 ε ̇− 0.05. Besides, the governing deformation mechanism of the Er-bearing TiAl alloy was the same as the Er-free TiAl alloy according to the strain rate sensitivity results.
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影响因子：
9.4
作者：
S. Yokoshima;M. Yamaguchi
通讯作者：
S. Yokoshima;M. Yamaguchi
DOI：
10.1007/bf02663918
发表时间：
1995-03
期刊：
Metallurgical and Materials Transactions A
影响因子：
--
作者：
G. -X. Wang;B. Dogan;F. -Y. Hsu;H. Klaar;M. Dahms
通讯作者：
G. -X. Wang;B. Dogan;F. -Y. Hsu;H. Klaar;M. Dahms
影响因子：
9.4
作者：
B. Viguier;J. Bonneville;Jean-Luc Martin
通讯作者：
B. Viguier;J. Bonneville;Jean-Luc Martin
影响因子：
6
作者：
F. Sun;C. Cao;Seung-eon Kim;Yongtai Lee;M. Yan
通讯作者：
F. Sun;C. Cao;Seung-eon Kim;Yongtai Lee;M. Yan
影响因子：
3
作者：
A. Kartavykh;M. Gorshenkov;D. Podgorny
通讯作者：
A. Kartavykh;M. Gorshenkov;D. Podgorny