Hot Deformation Behavior of a Ti-40Al-10V Alloy with Quenching-Tempering Microstructure.
Hot Deformation Behavior of a Ti-40Al-10V Alloy with Quenching-Tempering Microstructure.
复制标题
调质组织Ti-40Al-10V合金的热变形行为
DOI：
10.3390/ma11060872
复制
发表时间：
2018-05-23
期刊：
影响因子：
--
通讯作者：
Kou H
中科院分区：
文献类型：
--
作者：
Cheng L;Chen Y;Yang G;Xie L;Wang J;Lu Y;Kou H
本研究制备了一种调质组织的Ti-40Al-10V合金，合金内部具有超大的β/B2晶粒和亚微晶γ条。在β/B2和γ相之间确定了明确的Kurdjumov-Sachs取向。采用等温压缩试验研究了不同温度和应变速率下的热变形行为。根据双曲正弦方程，合金的变形动力学具有较高的活化能（384 kJ/mol）和较低的应力指数（2.25）。在所有变形试样中，β基体发生了密集的连续动态再结晶，并伴有γ条的同步旋转。此外，β相和γ相的优先取向分别为<100>β和<111>γ平行于压缩轴。随着应变速率的降低，晶界/界面滑动逐渐突出，产生了应变诱导的晶粒生长和界面迁移加剧、γ晶界“润湿”增强、局部织构不断弱化或消失等超塑性变形特征。同时，温度对热变形行为的影响不显著。在微观组织观察和变形动力学的基础上，详细讨论了变形机理。
In this study, a Ti-40Al-10V alloy with quenching-tempering microstructure was prepared and was characterized by ultra-large β/B2 grains and submicrocrystalline γ laths within it. A definite Kurdjumov-Sachs orientation was identified between the β/B2 and γ phase. Isothermal compression tests were performed to examine the hot deformation behavior at various temperatures and strain rates. Based on the hyperbolic-sine equation, the deformation kinetics of the alloy were characterized by unexpectedly high activation energy (384 kJ/mol) and low stress exponent (2.25). For all the deformed samples, continuous dynamic recrystallization intensively occurred in the β matrix, accompanied by the simultaneous rotation of the γ laths. Moreover, a preferential orientation of <100>β and <111>γ parallel to the compression axis was observed for β and γ phase, respectively. With the decreasing strain rates, the grain boundary/interface sliding gradually became prominent, which resulted in some superplastic deformation features, e.g., intensive strain-induced grain growth and interface migration, enhancing “wetting” of the γ grain boundaries, continuous weakening/vanishing of the local texture, etc. Meanwhile, the temperature played an insignificant role in the hot deformation behavior. The deformation mechanism was discussed in detail based on the microstructural observations and deformation kinetics.
登录
查看更多内容
DOI：
10.1016/j.msea.2007.09.093
发表时间：
2009-01-15
影响因子：
6.4
作者：
Kong, F. T.;Chen, Y. Y.;Li, B. H.
通讯作者：
Li, B. H.
影响因子：
4.4
作者：
Cheng, Liang;Li, Jinshan;Bouzy, Emmanuel
通讯作者：
Bouzy, Emmanuel
影响因子：
3.6
作者：
Clemens, Helmut;Wallgram, Wilfried;Bartels, Arno
通讯作者：
Bartels, Arno
DOI：
10.1016/j.msea.2016.08.079
发表时间：
2016-12-15
影响因子：
6.4
作者：
Cheng, Liang;Li, Jinshan;Bouzy, Emmanuel
通讯作者：
Bouzy, Emmanuel
影响因子：
3.6
作者：
Stark, Andreas;Bartels, Arno;Gerling, Rainer
通讯作者：
Gerling, Rainer