铝基复合材料超声波钎焊陶瓷颗粒增强接头强度机理
Strengthening mechanism of ceramic particle reinforced bonds by ultrasonic brazing of AlMMCs
冷雪松 1王长文 1张洋 2陈晓光 1闫久春1
作者信息
- 1. 哈尔滨工业大学 先进焊接与连接国家重点实验室,哈尔滨150001
- 2. 石家庄铁道大学 材料科学与工程学院,石家庄050043
- 折叠
摘要
对含有55％SiC高体积分数的铝基复合材料以Zn基合金作为钎料层进行超声波辅助钎焊.在420℃和475℃钎焊温度下,形成分别含有7％和35％SiC体积分数的连接接头.两种接头的微观拉伸原位分析结果显示,它们不但具有不同的微观结构,而且具有不同的裂纹生长传播机制,从而具有不同的力学性能.含有35％SiC的接头剪切强度达到244 MPa,比含有7％SiC的高出84.7％.其原因是接头中SiC颗粒可以抑制裂纹的产生及传播,Al基固溶体也可抑制裂纹生长.因此,在合适的超声波钎焊温度下,SiC颗粒和Al元素更多地扩散至接头区,使得接头剪切强度增高.
Abstract
Composite materials (55％ (volume fraction) SiCp/A356) were brazed with the assisted ultrasonic wave by filling with a Zn-based alloy solder.With different bonding temperatures,two kinds of bonds,which contained 7％ and 35％ SiC particles,respectively,were fabricated.The results show that the two kinds of bonds have not only different microstructure properties,but also different crack propagation behaviors,which will bring on wide difference in mechanical properties.The shear strength of the bond containing 35％ SiC particles is above 244 MPa,which is 84.7％ higher than that of the bond containing 7％ SiC particles.The reason is that the SiC particles in the composite bonds can effectively suppress the fracture.And the fracture is also effectively delayed by the Al-based solid solution in the composite bonds.Therefore,with appropriate bonding parameters,ultrasonic brazing can make the SiC particles and Al contents increase in the bond,and this distribution will contribute to the enhanced strength of the brazed bonds.
关键词
铝基复合材料/超声波辅助钎焊/断裂行为Key words
aluminum metal matrix composites/brazing with assisted ultrasonic wave/fracture behavior引用本文复制引用
基金项目
国家自然科学基金(50375039)
国家自然科学基金(50975054)
国家自然科学基金(50905044)
Aeronautics Science Foundation of China(20085277016)
出版年
2011
NETL
NSTL
万方数据