Y_2O_3对93W-4.9Ni-2.1Fe合金力学性能及断裂过程的影响  

Influence of Y_2O_3 on the mechanical properties and fracture process of 93W-4.9Ni-2.1Fe alloy

作　　者：姚志涛[1] 王迎春[1] 程兴旺[1] 李树奎[1] 王富耻[1] 

机构地区：[1]北京理工大学材料科学与工程学院,北京100081

出　　处：《兵器材料科学与工程》2008年第3期45-47,共3页Ordnance Material Science and Engineering

基　　金：国防科技预研基金项目资助(51412020304BQ0160)

摘　　要：研究93W-Y2O3合金的力学性能,并通过扫描电镜原位拉伸试验观察93W-Y2O3合金的断裂过程。结果表明:与传统93W合金相比,93W-Y2O3的抗拉强度和延伸率均有较大幅度降低;Y2O3降低了钨颗粒的强度,拉伸载荷下裂纹在多个钨颗粒内部萌生,随着拉伸载荷增加,裂纹尖端产生应力集中,裂纹优先沿着粘结相与Y2O3界面扩展;由于Y2O3阻碍了位错的滑移,使93W-Y2O3合金的塑性下降。The mechanical properties and fracture process observation was studied by in-situ tensile test of 93W-Y2O3. The results show that the tensile strength and elongation of 93W- Y2O3 decrease compared with 93W. As Y2O3 addition decreases the strength of tungsten grain, microcracks produce in some tungsten grains under tensile loading. Cracks propagate along the interface of matrix- Y2O3 first with the increase of tensile loading. As Y2O3 blocks the slip of dislocation, the plasticity of 93W- Y2O3 alloy reduces.

关 键 词：钨合金 Y2O3 力学性能 原位拉伸 

分 类 号：TG146.4[一般工业技术—材料科学与工程]