用TEM研究了γ/α不锈钢、铜/碳钢和黄铜/不锈钢三对不同金属爆炸焊的结合层。观察表明爆炸焊是通过接触面之间的扩散及局部熔化实现的。结合层的组织不仅和两侧金属的成分有关,还与它们的热导、熔点及再结晶温度的差别有关。由于熔区小,冷却速度快,可得到非晶、微晶,形成稳定相或亚稳相等不同组织。扩散层很薄,从几个原子距离到10~(-1)μm量级。如两种金属的热导及再结晶温度相差较大,则再结晶和回复区在热导好、再结晶温度低的一侧比另一侧清楚。形变区的组织与晶体结构及层错能有关。
The bonding layers in dissimilar alloy explosive bonding joints, γ/αstainless steels, copper/carbon steel and brass/γ-stainless steel have been studied bymeans of TEM technique. The results show that the bonding is obtained by diffu-sion and local melting at the contacted surface. The structure of bonding layer notonly responds to the compositions of the bonding alloys, but also the differencebetween their thermal conductivities, melting points and recrystallization tempera-tures. Because of the small molten region and fast cooling rate, the structure ofmolten region could be amorphous or microcrystals, and both stable and metastablephases exsist.
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