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

作　　者：董显娟[1,2] 鲁世强[1] 肖璇[1] 李鑫[1] 

机构地区：[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

出　　处：《热加工工艺》2010年第6期1-5,共5页Hot Working Technology

基　　金：江西省自然科学基金资助项目(2008GZC0041);江西省教育厅科技项目(GJJ08203)

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Ther mecmaster-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0.001～10s-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℃、0.01～1s-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→β相转变、且β相也较早开始再结晶有关。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.

关 键 词：TA15合金 α片层厚度 流动应力 激活能 β再结晶 

分 类 号：TG146.4[一般工业技术—材料科学与工程]