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首页> 外文会议>International Conference on Manufacturing >Formation of Micro Spot-Welding Joint of rapidly Solidified Ni-19.8Sn Alloy Foils
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Formation of Micro Spot-Welding Joint of rapidly Solidified Ni-19.8Sn Alloy Foils

机译：快速凝固的Ni-19.8％Sn合金箔的微点焊接接头形成

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In this study, the spot welding of rapidly solidified Ni-19.8%Sn alloy foils has been conducted by a micro-type capacitor discharge welder. The configuration and microstructural morphology of the joint were examined experimentally and he temperature of the micro nugget was analyzed numerically. The results show that the micro-joint consists of an oblate spheroid nugget and a 2.0～3.0 μm thick bond zone. The microstructure of the joint is fine and homogeneous and there is no coarsening sign in the parent materials near nugget. During solidification, the cooling rate of nugget is so high to the order of 106 K/s that the eutectic reaction of L → α-Ni + Ni_3Sn was suppressed or at least partly suppressed and almost all of the liquid within the joint solidified into supersaturated α-Ni. Therefore, the joint microstructure which is consistent with the microstructure of the alloy foils shows the characteristics of rapid solidification. In addition, a kind of streamline due to vortex flow in micro nugget, with dispersed dross distributes in cluster along the streamline, is formed under electromagnetic force and electrode pressure.
机译：在该研究中，通过微型电容器放电焊机进行了快速固化的Ni-19.8％Sn合金箔的点焊。通过实验检查关节的构型和微观结构形貌，数值分析了微金块的温度。结果表明，微关节由扁圆形块和2.0〜3.0μm厚粘接区组成。关节的微观结构是细且均匀的，纽扣附近的母材没有粗化征兆。在凝固过程中，熔化的冷却速率为106k / s的顺序，即L→α-Ni + Ni_3Sn的共晶反应或至少部分地抑制，几乎将所有液体固化为超饱和α-Ni。因此，与合金箔的微观结构一致的关节微观结构表明了快速凝固的特征。另外，由于微金块中的涡流引起的流线，其中具有分散的渣滓在沿着流线下分布在集群中，在电磁力和电极压力下形成。

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