王柯,黎东荣,辛仁龙,郭艳华,常辉,刘庆

• 1:重庆大学材料科学与工程学院
• 2:南京工业大学材料科学与工程学院

摘要(Abstract)：

采用Gleeble-3500热模拟压缩试验机对一种新型的β钛合金Ti-34521进行热模拟压缩实验,其应变速率为0.1～30 s~(-1),变形温度为750～1000℃,压下量为50%,并采用光学显微镜和电子背散射衍射(EBSD)技术对变形后的微观组织进行表征,研究了该合金高温变形过程中的微观组织演变机制。结果表明:变形后合金的β晶粒沿着垂直于压缩方向被压扁,并形成了<001>和<111>变形丝织构。随着变形温度的升高和应变速率的降低,β晶粒的动态回复(DRV)和动态再结晶(DRX)逐渐增强,且晶界弓出行为和生成的DRX晶粒使得β晶界呈现出锯齿状和项链状形貌。最后,讨论了合金的微观组织演变和力学行为之间的关系,发现当应变增大到0.4以后,合金的表观变形激活能为221.533～201.207 kJ/mol,该值与β-Ti自扩散激活能相近,这是由于动态回复是合金变形过程中的主要动态软化机制所致。

关键词(KeyWords)： β钛合金;高温变形;微观组织;动态再结晶

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51971046);; 中央高校基本科研业务费(2020CDJGFCL005)

作者(Author): 王柯,黎东荣,辛仁龙,郭艳华,常辉,刘庆

DOI: 10.13289/j.issn.1009-6264.2021-0053

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