Variations of microstructure and tensile property of γ-TiAl alloys with 0–0.5 at% C additives
Variations of microstructure and tensile property of γ-TiAl alloys with 0–0.5 at% C additives
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变化%20of%20微观结构%20和%20拉伸%20性能%20of%20γ-TiAl%20合金%20with%200-0.5%20at%%20C%20添加剂
DOI：
10.1016/j.msea.2017.06.019
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发表时间：
2017-07
期刊：
影响因子：
--
通讯作者：
Hengzhi Fu
中科院分区：
文献类型：
--
作者：
Qiang Wang;Hongsheng Ding;Hailong Zhang;Ruirun Chen;Jingjie Guo;Hengzhi Fu
在成分为Ti-47 Al-2Nb-2Cr的层状γ-TiAl合金中加入合金元素C。B2相的体积分数随着碳含量的增加而降低。当碳含量为0.5at%时，合金中的碳原子主要以固溶体形式存在，少量细小碳化物弥散分布在片层基体中。对于含碳的TiAl合金，晶格参数（即，由于碳在α 2相中的固溶度较高，α 2相的晶胞体积增大幅度大于γ相。碳的加入通过促进γ相形核和抑制γ板条增厚来细化TiAl基合金的片层间距。碳的加入提高了TiAl基合金的室温拉伸性能，其中碳含量为0.2at%的合金具有最高的抗拉强度。断裂方式以穿层为主。此外，由于部分层片表现出韧性断裂特征，C掺杂的TiAl合金获得了更优异的高温塑性。含碳TiAl合金中纳米孪晶的存在有助于提高合金的高温强度。
Alloy element carbon was added into a lamellar γ-TiAl alloy with a composition of Ti-47Al-2Nb-2Cr. The volume fraction of B2 phase decreased with the increase of carbon content. Most of carbon atoms were in solid solution state in the C-containing TiAl alloys and some fine carbide were dispersedly distributed in the lamellar matrix in case of 0.5 at% carbon additions. For the TiAl alloys containing carbon, the lattice parameters (i.e.,aandc) and unit cell volume of α2phase increased larger than those of γ phase due to higher solid solubility of carbon in the α2phase. Incorporations of carbon refined the interlamellar spacing of the TiAl based alloys by promoting the nucleation of γ phase and suppressing the thickening of γ lath. The room temperature tensile properties of the TiAl based alloy were improved by the additions of carbon and the alloy with 0.2 at% C showed the highest tensile strength. The trans-lamellar was the major fracture mode. Besides, more excellent high temperature ductility was acquired for the C-doped TiAl alloys because parts of the lamellae displayed the features of ductile fracture. Presence of nano-twins in the C-containing TiAl alloys contributed to the higher high-temperature strength.
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影响因子：
4.4
作者：
J. Yang;Hangyue Li;D. Hu;M. Dixon
通讯作者：
J. Yang;Hangyue Li;D. Hu;M. Dixon
影响因子：
4.4
作者：
Chen, Yuyong;Niu, Hongzhi;Xiao, Shulong
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影响因子：
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作者：
C. Scheu;E. Stergar;M. Schober;L. Cha;H. Clemens;A. Bartels;F. Schimansky;A. Cerezo
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C. Scheu;E. Stergar;M. Schober;L. Cha;H. Clemens;A. Bartels;F. Schimansky;A. Cerezo
DOI：
10.1016/s0921-5093(01)01494-0
发表时间：
2002-06
影响因子：
6.4
作者：
In-Soo Jung;Hs Jang;M. Oh;J. Lee;D. Wee
通讯作者：
In-Soo Jung;Hs Jang;M. Oh;J. Lee;D. Wee
DOI：
10.1007/s11661-001-0256-x
发表时间：
2001-02
期刊：
Metallurgical and Materials Transactions A
影响因子：
--
作者：
H. S. Park;S. Hwang;C. Lee;Y. Yoo;S. Nam;N. Kim
通讯作者：
H. S. Park;S. Hwang;C. Lee;Y. Yoo;S. Nam;N. Kim