摘要
在变形温度为920~1 100℃、应变速率为0.001~70.0s^(-1)条件下对Ti60合金进行了等温恒应变速率压缩试验,分析了合金的流动行为和塑性变形机制。结果表明,Ti60合金的流动应力对变形温度和应变速率均较敏感。在α+β两相区,随变形温度的升高,α相体积分数逐渐减少,片状组织球化率增高;在变形温度较低、应变速率较高时,易发生局部流动现象。在β单相区,应变速率较低时,β相易发生动态再结晶;应变速率较高时,易造成机械失稳。
Hot deformation behavior of Ti60 alloy was carried out on a Thermecmastor Zsimulator at920-1 100℃and strain rate at 0.001-70.0s（-1）.The elevated temperature deformation behavior of the Ti60 alloy was characterized based on ananalysis of the true stress-strain behavior.The results show that the low stress is increased with increasing in strain rate and decreasing in temperature.In theα＋βtwo phase region,theαphase volume fraction is decreased and spheroidization rate of lamellar structure is increased with the increase of deformation temperature.The flow localization can be observed in the deformed microstructure with the lower deformation temperature and the higher strain rate.In theβphase region,the deformation mechanism is characterized by dynamic recrystallization when the strain rate is low,while the strain rate is high,it is easy to cause the mechanical instability.
出处
《特种铸造及有色合金》
CAS
CSCD
北大核心
2016年第5期473-476,共4页
Special Casting & Nonferrous Alloys
基金
国家自然科学基金资助项目(51164030)
江西省教育厅科技基金资助项目(GJJ13501)
轻合金加工科学与技术国防重点学科实验室基金资助项目(gf201401007)
关键词
钛合金
变形行为
微观组织
应变速率敏感因子
Titanium Alloy
Defomration Behavior
Microstructures
Strain Rate Sensitivity
