激光焊接Be/Al焊缝的组织与力学性能分析  

Analysis of microstructure and mechanical properties of Be/Al weld

作　　者：郝国建[1] 林志[1] 林均品[1] 王艳丽[1] 

机构地区：[1]北京科技大学新金属材料国家重点实验室,北京100083

出　　处：《焊接学报》2006年第5期89-92,共4页Transactions of The China Welding Institution

摘　　要：利用纳米力学探针对Be/Al焊接截面的组织与性能做了分析。结果表明,焊缝的熔合区为细小的Be晶粒镶嵌在铝基体中的复合物,熔合区的复合物凝固点与Be之间存在着较大的差值,使焊缝的凝固温度区间加大,这极易产生热应力,导致熔合区与Be的交界处的力学性能下降。焊接接头区域显微硬度和弹性模量在界面处都存在着一定的梯度,但在焊件的热影响区的显微硬度与弹性模量相当不稳定,焊接裂纹易产生于焊接接头的Be侧区域。Microstructure and mechanical properties of Be/Al weld were analyzed with nano indenter. The results showed that there are beryllium phases embedded in the aluminum matrix in the fusion zone. The microstructure of the fusion zone is low melting point phase that enlarged the region of weld solidification temperature and brought great thermal stress, especially at the side of beryllium. There are the certain gradients of microhardness and elastic modules at the interface of Be/Al welded joint. The microhardness and elastic modules are not stable at beryllium side of joint zone, which indicates that there exist brittle phase at heat affected zone. So the welding cracks nucleated easily at beryllium side of welding zone.

关 键 词：纳米力学探针 共晶组织 Be/Al 力学性能 激光焊接 

分 类 号：TG457.19[金属学及工艺—焊接]