片层厚度对TA15合金β相区变形行为的影响
Effect of Lamellar Thickness on Deformation Behavior of β Phase Region in TA15 Alloy
董显娟1,2, 鲁世强1, 肖 璇1, 李 鑫1
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作者单位：1. 南昌航空大学 材料科学与工程学院, 江西 南昌 330063; 2.南京航空航天大学 材料科学与技术学院, 江苏 南京 210016
中文关键字：TA15合金； α片层厚度； 流动应力； 激活能； β再结晶
英文关键字：TA15 alloy; α lamellar thickness; flow stress; activation energy; β re-crystallization
中文摘要：将具有不同α片层厚度的两种转变组织的TA15合金分别在Thermecmaster-Z型热模拟试验机上进行等温恒应变速率压缩试验， 研究了温度为1000～1100 ℃、 应变速率为0.001～10 s-1时合金的热变形行为。 结果表明，两种不同组织的TA15合金在β相区相同热力参数变形时， 真应力-真应变曲线的形貌和真应力值基本相同，变形激活能为(170±2) kJ/mol，且微观组织特征基本相似，以β相的动态再结晶为主。但在1050 ℃、 0.01～1 s-1变形时，细片层组织的合金发生β相动态再结晶的体积分数总是略高于粗片层组织的合金，这可能与细片层组织的合金较早发生α?邛β相转变、且β相也较早开始再结晶有关。
英文摘要：Hot compression tests of two TA15 alloys with different α-lamellar thickness, which is respectively transformed at furnace coolling and air cooling, were conducted using Therme-cmastor-Z hot working simulator. Hot deformation behavior was investigated at 1000～1100 ℃ and strain rate of 0.001～10 s-1. The results show that the shapes and stress values of the true stress-strain curves of the two TA15 alloy are identical and the activation energy is nearly (170±2) kJ/mol. The microstructure characteristic of the two TA15 alloy is similar under the same hot deformation parameters, which is mainly manifested by dynamic re-crystalized β grains. The re-crystalized β volume fraction of the TA15 alloy with thin lamellar microstructure is slightly higher than that with thick lamellar at 1050 ℃ and strain rate of 0.01～1s-1. This may be because the microstructure transformation from α to β phase starts earlier in thin lamellar than in thick lamellar, and β phase re-crystalizes earlier.