作　　者： ; ; ; ; ;

机构地区： 中南大学材料科学与工程学院

出　　处： 《北京科技大学学报》 2009年第5期585-590,共6页

摘　　要： 利用原位拉伸扫描电镜观察,研究ZK60合金及含稀土Y的ZK60(0.9Y)合金热轧板材动态拉伸过程中裂纹萌生和扩展情况,讨论合金的显微组织与断裂行为的相互关系.实验表明:在拉伸过程中,合金轧制态试样裂纹以撕裂的形式进行扩展,断口区域有解理、准解理断裂痕迹,ZK60(0.9Y)合金裂纹萌生所需载荷大于ZK60合金,且在拉伸过程中发生第2相的破碎,主裂纹沿第2相扩展,基体中的二次裂纹多萌生于第2相周围. Crack initiation and propagation in ZK60 and ZK60（0.9Y） alloy sheets during dynamic tensile process were investigated by using in situ tensile scanning electron microscope. The relationship between alloy mierostructure and rupture behavior was discussed. Experimental results show that cracks in rolling samples propagate by tearing way. There are cleavage fracture and quasicleavage fracture in the fracture zone. The loading of crack initiation in ZK60（0.9Y） alloy is larger than that of ZK60 alloy. The second phase breaks in the tensile process and the main crack propagates along the second phase. The secondary crack in matrix mostly germinates around the second phase.

关 键 词： 合金 原位观察 断裂行为 显微组织

领　　域： [金属学及工艺] [一般工业技术] [金属学及工艺]