【摘要】 采用电子背散射衍射（EBSD）技术对铝合金/超高强钢等离子弧熔-钎焊接头界面的组织构成、晶粒取向和取向差分布、晶粒尺寸、织构情况进行了研究。结果表明：铝合金/超高强钢等离子弧熔-钎焊接头界面组织呈明显的双层结构，由Fe₄Al₁₃相和Fe₂Al₅相组成，两相在晶粒尺寸和形态上存在明显差异。Fe₄Al₁₃相呈细小的等轴晶形态，以大角度晶界为主，Fe₂Al₅相呈柱状晶形态，以小角度晶界为主。Fe₄Al₁₃相的晶粒尺寸明显小于Fe₂Al₅相晶粒尺寸。Fe₄Al₁₃相的主要织构为<010>丝织构，Fe₂Al₅相晶粒具有明显的择优取向，其主要织构为<001>丝织构。更多还原

【Abstract】 The technique electron backscatter diffraction was used to investigate the microstructure,grain orientation,grain size and texture of the interface intermetallic compound of aluminum alloy/ultrahighstrength steel plasma arc welding-brazing joint.The results indicated that the interface zone exhibited an obvious double-layer structure with different sizes and morphologies,which is composed of Fe₄Al₁₃ phase and Fe₂Al₅ phase.The Fe₄Al₁₃ phase has fine equiaxed grains morphology and is dominated by high-angle one,while the Fe₂Al₅ phase has columnar grains morphology and is dominated by low-angle grain boundary.The grain size of Fe₄Al₁₃ is obviously smaller than that of Fe₂Al₅.The main texture of Fe₄Al₁₃phase is<010>silk texture,while the main texture of Fe₂Al₅ phase is<001>silk texture with obvious preferred orientation.更多还原