原位自生TiB和TiC增强钛基复合材料的超塑变形行为及机理研究  

Research on Superplastic Deformation Behavior and Mechanism of Enhanced Titanium-base Composite Material In-situ Autogenesis TiB and TiC

作　　者：王敏敏[1] 罗月新[1] 计波[1] 朱峰[1] 

机构地区：[1]宝山钢铁股份有限公司特殊钢分公司特殊钢技术中心,上海200940

出　　处：《上海钢研》2006年第4期30-34,共5页Journal of Shanghai Iron and Steel Research

摘　　要：研究了温度为920～1080℃、初始应变速率为2×10^(-2)s^(-1)～10^(-4)s^(-1)条件下的原位自生 TiB 和 TiC 增强钛基复合材料的超塑变形行为。试验得到429%的最大延伸率,计算所得最大 m 值为0.47,但这两者并不是在同一试验中取得。在变形过程中,m 值随应变增加而增大,达到最大值后,m 值随应变增加而减小。在920～1040℃和1040～1080℃温度范围内,激活能分别为492kJ/mol、673kJ/mol 和275kJ/mol,表明变形受不同机制控制。在1040～1080℃,变形受晶界扩散控制;而在920～1040℃,除晶界扩散外,位错运动和动态再结晶在变形中占了主导作用。This paper studied the superplastic deformation behavior of enhanced titanium-base composite material in-si- tu autogenesis TiB and TiC under conditions of temperature varied in the range of 920～1080℃ and initial strain rate was 2× 10^(-2)s^(-1)～10^(-4)s^(-1).The maximum elongation 429% was obtained in one test and the maximum calculated m value was 0.47. However,these data were obtained from different tests.In the process of deformation,m value increases with the increase of strain until it reaches the max...

关 键 词：钛基复合材料 超塑变形 应变速率敏感性因子 激活能 

分 类 号：TB33[一般工业技术—材料科学与工程]