Ta-10W合金的高温断口分析  

Fractographic Features of Ta-10W Alloy after High Temperature Mechanical Properties Test

作　　者：吴孟海 张兴平 许德美 赵洪章 李陈 

机构地区：[1]宁夏东方钽业股份有限公司,宁夏石嘴山753000

出　　处：《稀有金属》2007年第4期434-439,共6页Chinese Journal of Rare Metals

摘　　要：为了研究Ta-10W合金在高温下的塑性变形机制,对再结晶状态的Ta-10W合金棒材在1000～2000℃进行了高温力学性能测试后,对该合金在各个高温下形成的拉伸断口进行了研究分析。研究表明:Ta-10W合金从1000～2000℃的高温塑性变形呈现出金属在高温下变形的一般规律:随着温度的升高,Ta-10W合金的塑性变形机制由以滑移为主的变形机制向以晶界滑动和转动为主的变形机制转变;该合金在高温变形中存在着加工硬化和动态回复或再结晶两个相反的过程,且动态再结晶对塑性的贡献高于动态回复。　To research the plastic deformation mode of Ta-10W alloy at high temperature,the mechanical properties of the recrystallized Ta-10W rod at high temperature ranging from 1000 ℃ to 2000 ℃ were tested,and the fractographic features of fractures formed at various high temperatures were analyzed.The analysis showed that the plastic deformation mode of Ta-10W alloy accorded with general law of metal plastic deformation at high temperature.The plastic deformation mode of Ta-10W alloy transformed from slipping mode to grain boundary gliding and turned with increasing test temperature.Two contrary courses of work-hardening and dynamic recovery or dynamic recrystallization existed at high temperature plastic deformation,and dynamic recrystallization had much influence on plasticity than dynamic recovery.

关 键 词：Ta-10W合金 高温断口分析 晶界滑动 动态回复和再结晶 塑性变形 

分 类 号：TG146.4[一般工业技术—材料科学与工程] TF125.2[金属学及工艺—金属材料]