Understanding the role of carbon atoms on microstructure and phase transformation of high Nb containing TiAl alloys
Understanding the role of carbon atoms on microstructure and phase transformation of high Nb containing TiAl alloys
复制标题
了解碳原子对高 Nb 含 TiAl 合金微观结构和相变的作用
DOI：
10.1016/j.matchar.2016.12.008
复制
发表时间：
2017-02
影响因子：
4.7
通讯作者：
Li Jinshan
中科院分区：
文献类型：
--
作者：
Wu Zeen;Hu Rui;Zhang Tiebang;Zhang Fan;Kou Hongchao;Li Jinshan
研究了Ti-46 Al-8 Nb-xC（x= 0.1，0.7，1.4，2.5at.%）高铌TiAl合金的凝固组织和凝固行为。研究了电弧熔炼法制备的SiO_2/Al_2O_3复合材料。结果表明，碳的加入改变了合金的凝固行为，使合金的凝固行为由β相凝固转变为包晶凝固。固溶体中的碳在α 2相中富集，提高了显微硬度。当碳含量增加到1. 4原子%时，TiAl基体中析出了板状碳化物Ti 2AlC（H相），细化了组织。淬火后在1173 K时效24 h，在Ti-46 Al-8 Nb-2. 5 C合金基体中观察到细小的针状和颗粒状Ti 3 AlC（P相）碳化物，它们沿着片层组织分布或围绕片状Ti 2 AlC分布。透射电子显微镜观察表明，Ti 3AlC碳化物在位错处析出。相变原位观察表明，在固态相变过程中，部分Ti 2AlC碳化物析出。
The microstructure and solidification behavior of high Nb containing TiAl alloys with the composition of Ti-46Al-8Nb-xC (x= 0.1, 0.7, 1.4, 2.5 at.%) prepared by arc-melting method have been investigated in this work. The results give evidence that the addition of carbon changes the solidification behavior from solidification via the β phase to the peritectic solidification. And carbon in solid solution enriches in the α2phase and increases the microhardness. As the carbon content increases to 1.4 at.%, plate-shape morphology carbides Ti2AlC (H phase) precipitate from the TiAl matrix which leads to the refinement microstructure. By aging at 1173 K for 24 h after quenching treatment, fine needle-like and granular shape Ti3AlC (P phase) carbides are observed in the matrix of Ti-46Al-8Nb-2.5C alloy, which distribute along the lamellar structure or around the plate-shape Ti2AlC. Transmission electron microscope observation shows that the Ti3AlC carbides precipitate at dislocations. The phase transformation in-situ observations indicate that the Ti2AlC carbides partly precipitate during the solid state phase transformation process.
登录
查看更多内容
影响因子：
10.9
作者：
Yingche Ma;Z. Jiang;Bo Chen;Xiujuan Zhao;M. Gao;Kui Liu;Yiyi Li
通讯作者：
Yingche Ma;Z. Jiang;Bo Chen;Xiujuan Zhao;M. Gao;Kui Liu;Yiyi Li
影响因子：
4.4
作者：
Chang-Yong Nam;D. Wee;P. Wang;K. Kumar
通讯作者：
Chang-Yong Nam;D. Wee;P. Wang;K. Kumar
DOI：
10.1016/s0921-5093(98)00539-5
发表时间：
1998-07
影响因子：
6.4
作者：
S. Kim;G.D.W. Smith;S. Roberts;A. Cerezo
通讯作者：
S. Kim;G.D.W. Smith;S. Roberts;A. Cerezo
影响因子：
9.4
作者：
W.J. Zhang;U. Lorenz;F. Appel
通讯作者：
W.J. Zhang;U. Lorenz;F. Appel
影响因子：
4.4
作者：
Tian, WH;Nemoto, M
通讯作者：
Nemoto, M