Sr和SmO对Mg_2Si-AlSi/3003钎缝化合物形态的影响

Effect of Sr,SmO on speciation compound of Mg_2Si-AlSi/3003 brazed seam

为了改善铝合金真空钎焊时的表面活化问题,用原位生成方法将Mg_2Si引入到Al Si钎料中,开发出AlSiMg_2Si复合钎料.借助电子探针对钎料金相组织进行分析,结果表明,引入的Mg_2Si相呈现块状、骨骼状和粒状三种形态分布于钎料基体上.用面扫描方法对钎焊界面进行分析,结果发现,在钎缝中,Mg元素大量固溶在α-Al晶粒内;含有Mg_2Si的钎料能形成较宽的钎焊扩散层,粒状、短棒状Mg_2Si沿着α-Al晶界向焊缝两侧呈放射状分布.经过Sr,SmO变质后放射状扩散层消失、钎缝变窄,化合物被细化,形态为粒状.

In order to improve the surface activation during aluminum alloy vacuum brazing,the Mg_2Si was introduced into AlS i filler metal by in situ generation method,consequently a composite filler metal was developed. The metallographic analysis of the filler metal by means of electron probe shows that the introduced Mg_2Si spread over the filler metal matrix in massive,skeletal and granular forms. The map scanning method was used to analyze the brazing interface,the results show that a large amount of magnesium dissolved in-Al matrix. The filler metal containing Mg2 Si can form a wider diffusion layer. The Mg_2Si presented as the forms of granular and short rods in the brazed seam.And it extended radially to the sides of the base material along the α-Al grain boundaries. After the modification of Sr and Sm O,the brazed seam became narrower,the radial diffusion layer disappeared,and the compounds were refined with granular shape.