High-temperature deformation behavior of Ti60 titanium alloy
High-temperature deformation behavior of Ti60 titanium alloy
复制标题
Ti60钛合金高温变形行为
DOI：
10.1016/j.msea.2011.01.113
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发表时间：
2011-05-15
期刊：
影响因子：
6.4
通讯作者：
Wang, Qingjiang
中科院分区：
文献类型：
--
作者：
Jia, Weiju;Zeng, Weidong;Wang, Qingjiang
在Gleeble-3800热模拟机上对近α Ti60合金进行了等温压缩实验，压缩温度范围为960-1110 ℃，应变速率范围为0.001-10.0 s（-1）。通过应力-应变行为、动力学和加工图分析，表征了该合金的高温变形行为。两相流场的流变应力行为比单相流场的流变应力行为表现出更大的流变软化。在两相流场中，流动软化是由于变形过程中片层的破碎和球化以及变形加热引起的。而在单相区，流动软化是由动态回复和再结晶引起的。采用双曲正弦关系的流变应力数据，表观活化能被确定为653 kJ/mol和183 kJ/mol的两相场和单相场，分别。加工图显示出两个不稳定区域：960-980 ℃（0.3-10 s（-1））和990-1110 ℃（0.58-10 s（-1））。由于Ti60合金在变形过程中存在流动局部化现象，应避免这些场的出现。(C)2011 Elsevier B. V.保留所有权利。
Isothermal compressions of near-alpha Ti60 alloy were carried out on a Gleeble-3800 simulator in the temperature range of 960-1110 degrees C and strain rate range of 0.001-10.0 s(-1). The high-temperature deformation behavior was characterized based on an analysis of the stress-strain behavior, kinetics and processing map. The flow stress behavior revealed greater flow softening in the two-phase field compared with that of single-phase field. In two-phase field, flow softening was caused by break-up and globularization of lamellar a as well as deformation heating during deformation. While in the single-phase field, flow softening was caused by dynamic recovery and recrystallization. Using hyperbolic-sine relationships for the flow stress data, the apparent activation energy was determined to be 653 kJ/mol and 183 kJ/mol for two-phase field and single-phase field, respectively. The processing map exhibited two instability fields: 960-980 degrees C at 0.3-10 s(-1) and 990-1110 degrees C at 0.58-10 s(-1). These fields should be avoided due to the flow localization during the deformation of Ti60 alloy. (C) 2011 Elsevier B.V. All rights reserved.