摘要
对自然时效1、3、5、7个月的ZnAl15钎料进行了显微组织和力学性能分析,结果发现,未经时效的ZnAl15钎料组织主要是过饱和α-Al相和过饱和β-Zn相,随时效时间的延长,钎料中过饱和α-Al相和过饱和β-Zn相发生脱溶分解,引起富Al的α相的体积分数增加,而Zn含量较高的β相和α相组成的共析组织的体积分数减少;另外,钎料组织中O含量逐渐增多,钎料晶界产生氧化物,导致晶界模糊、弱化。钎料组织形貌、相组成等随时效时间的增加而发生改变,导致钎料抗拉强度和延伸率下降、显微硬度升高。时效7个月的钎料其抗拉强度降低33%、延伸率降低65%,而显微硬度增加15%。
The micrestmcture and mechanical properties of ZnAll5 filter metal with natural aging time of 1,3,5,7 months respectively were investigated. Experimental results showed the microstructure of ZnAll5 filter metal without natural aging consisted of supersaturated et-Al and supersaturated β-Zn phases. With aging time increasing, exsolution appeared for the supersaturated et-Al and supersaturated β-Zn phases, which led to the increase of the volume fraction of Al-rich et phases and the decrease of the volume fraction of the Zn-rich eutectoid structure containing et and β phases. In addition, the content of oxygen increasing induced by the increase of aging time led to the precipitation of oxide in the grain boundaries, which weakened the strength of the grain boundary. The tensile strength and elongation decrease with the increase of aging time while the micmhardness increases. After the natural aging of 7 months, the tensile strength and elongation of ZnAll5 filter metal reduce 33% and 65% respectively while the microhardness increases 15%.
出处
《失效分析与预防》
2013年第1期20-24,共5页
Failure Analysis and Prevention
基金
科技部科研院所专项资金项目(2010EG119118)
河南省科技创新杰出人才项目(104200510018)
