AZ31B镁合金焊接接头断裂形式分析  

AZ31B magnesium alloy welded joint fracture mode analysis

作　　者：高睿 

机构地区：[1]辽宁理工学院工程技术学院,辽宁锦州121000

出　　处：《世界有色金属》2017年第5期7-8,共2页World Nonferrous Metals

摘　　要：镁合金具有轻质高韧低密度的特点,可以代替传统的铝合金和钢材原料,而被广泛应用于航空航天、汽车及电子领域。而合金材料的焊接质量直接影响金属构件的使用性能。因此本文采用拉剪力实验研究了AZ31B镁合金焊接接头在外力作用下的断裂形式,对断口显微结构、熔核最大拉应力及熔核尺寸进行了分析。结果表明,撕裂式断裂具有韧性断裂的典型显微形貌,而整核式断裂则是韧性断裂和脆性断裂混合的结果 ;熔核最大拉应力会对断裂形式产生影响,当拉应力极值大于母材抗拉强度时,接头发生整核断裂,反之断口断裂形式为撕裂式断裂;5.9mm为撕裂式断裂和整核式断裂的临界熔核尺寸。The magnesium alloy has the characteristics of low density of lightweight Gao Ren, can replace the traditional aluminum alloy and steel raw materials, is widely used in aerospace, automotive and electronics field. The alloy material of welding quality directly affect the performance of metal components. So this article AZ31B magnesium alloy welded joint was investigated using tensile shear test in fracture mode under external force, the fracture microstructure, nuclear and maximum tensile stress of molten nuclear size are analyzed. The results showed that the tear type fracture has typical ductile fracture of microscopic morphology, and the nuclear type fracture is ductile fracture and brittle fracture of mixed results; Molten nuclear maximum tensile stress will affect the fracture form, when the tensile stress in the extreme value is greater than the parent metal tensile strength, joint whole nuclear fragmentation, fracture form and fracture is tearing type fracture; 5.9 mm is tearing fracture and the whole nuclear type fracture critical fusion nuclear size.

关 键 词：AZ31B镁合金 断裂形式 熔核尺寸 熔核最大拉应力 

分 类 号：TP277[自动化与计算机技术—检测技术与自动化装置]