Ti14合金半固态压缩变形量对微观组织和流变行为的影响  

Effect of Compressive Amount on Microstructure and Rheologic Behavior of Ti14Alloy at Semi-solid State

作　　者：郝一鸣[1] 王利捷[1] 陈永楠[1] 郝建民[1] 赵永庆[2] 马雪单[2] 

机构地区：[1]长安大学材料科学与工程学院,陕西西安710064 [2]西北有色金属研究院,陕西西安710016

出　　处：《热加工工艺》2014年第10期110-113,共4页Hot Working Technology

基　　金：国家973项目(2007CB613807);国家自然科学基金项目(51201019);中央高校基本科研专项资金资助(2013G3314002)

摘　　要：利用Gleeblel500热／力模拟机研究了Til4合金在应变速率为5×10-1s-1，变形温度1050、1100℃条件下，压缩变形量对合金半固态塑性变形行为和微观组织的影响。分析了合金流变应力与变形量之间的关系，探讨了变形量对合金微观组织尤变形过程中液相分布的影响，计算了不同温度和变形量的液相流动率。结果表明：合金在半固态条件下存在明显屈服现象，变形量的增加引起了流变应力的降低，其中变形量在50％～60％时。流变应力受变形量影响较大，随变形温度增加，变形量对流变应力影响减缓。分析认为：流动率是影响合金半固态流变行为的主要原因，变形量的增加引起了液相流动率的阶段性变化，其中，大变形量使得液相流动率增加，减缓应力集中，表现为较小的流变应力。The semi-solid rheologic behavior of Til4 with different compressive amounts was investigated by Gleedle 1500, with strain rate of 5× 10-1 s-1, and deformation temperature of 1050 ℃ and 1100 ℃. The relationship between flow stress and microstructure as well as compressive amounts were analyzed and the liquid flow rates were calculated. The results show that the alloy expresses obvious yield point, the flow stress decreases with the increase of compressive amounts, especially between 50% and 60% at 1050 ℃. The change of flow stress may result from the change of liquid flow rate caused by different compressive amounts. The larger stress makes high flow rate of liquid, which can relax stress concentration and reduce flow stress.

关 键 词：半固态 Ti14 钛合金 压缩变形 变形量 

分 类 号：TG146.22[一般工业技术—材料科学与工程]