Elevated Temperature Deformation Behavior of TA7 Titanium Alloy

IF 0.6 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY 稀有金属材料与工程 Pub Date : 2018-08-01 DOI:10.1016/S1875-5372(18)30189-9

Yang Xiaokang, Wang Kuaishe, Shi Jiamin, Wang Meng, Cai Jun, Wang Qingjuan, Liu Yingying

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引用次数: 4

Abstract

Isothermal compression tests in the temperature range of 1123∼1273 K and the strain rate range of 0.001∼1 s⁻¹ were conducted to analyze the elevated temperature deformation behavior of TA7 titanium alloy for the purpose of acquiring optimum processing parameters. Besides, a modified parallel constitutive model was put forward to illustrate the high temperature flow stress as a function of the strain rate, deformation temperature and true strain. Thereafter, the processing map which was on the basis of dynamic materials model was established. The investigation was made from the microstructure of compressed TA7 titanium alloy specimens to validate processing map. According to the results, the deformation temperature of 1223 K and strain rate of 0.001 s⁻¹ are the best processing parameters for the TA7 alloy. In addition, the instability regions are in a relatively lower temperature-higher strain rate region.

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TA7钛合金的高温变形行为

在1123 ~ 1273 K的温度范围和0.001 ~ 1 s−1的应变速率范围内进行等温压缩试验，分析TA7钛合金的高温变形行为，以获得最佳的加工参数。此外，提出了一种改进的平行本构模型来描述高温流变应力与应变速率、变形温度和真应变的关系。在此基础上，建立了基于动态材料模型的加工图。对TA7钛合金压缩试样的显微组织进行了研究，验证了工艺图的正确性。结果表明，1223 K的变形温度和0.001 s−1的应变速率是TA7合金的最佳加工参数。此外，失稳区处于相对较低的温度-高应变速率区域。

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