采用纯镍中间夹层和激光焊技术,连接TiNi形状记忆合金丝和不锈钢丝异种材料.对比分析了加镍夹层与未加镍夹层的激光焊接头的组织和性能.结果表明,与未加镍夹层的接头相比,加镍夹层的接头组织和性能得到明显改善,接头组织中γ-Fe相含量增加,TiFe2,TiCr2等金属间化合物相含量减少,焊缝区硬度明显降低,接头抗拉强度提高.未加镍夹层的接头的抗拉强度仅为187MPa,断口呈现典型的脆性断裂特征.加镍夹层后,接头抗拉强度提高至372MPa,断口具有脆-韧混合型断裂特征.
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