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用宏微观织构分析方法研究了A6铝导线冷拉拔过程中的织构演变。结果表明,这种导线在拉拔过程中形成以<111>和<100>丝织构为主的形变织构,随着变形量的增大<100>织构减少、<111>织构增强。形变织构沿导线的径向呈不均匀分布:在中等形变量情况下,从导线表层至中心织构由强<100>织构(体积分数~52%)过渡到强<111>织构(体积分数~55%);在高应变量情况下,径向织构梯度减弱,通体形成强<111>织构(各层的<111>织构体积分数超过70%)。同时,在拉拔过程中导线心部的硬度比表层的高,表明织构对导线强度及沿径向分布梯度起重要作用。用调整拉拔工艺可对位错密度和织构及其分布进行优化,进而提高导线的强度和导电性能。
The texture evolution of A6 aluminum wire during cold drawing was studied by macro-micro texture analysis. The results show that this wire forms a deformed texture mainly of <111> and <100> silk texture during drawing, and the texture of <111> decreases as the amount of deformation increases, and the texture of <111> . Deformation textures are unevenly distributed along the radial direction of the wire: at moderate deformations, the transition from the surface of the wire to the center is performed by a strong <100> texture (volume fraction ~ 52%) to a strong <111> texture Volume fraction ~ 55%). At high strain, the radial texture gradient weakened and the bulk formed a strong <111> texture (<111> texture volume fraction of each layer exceeded 70%). At the same time, the hardness of the core of the wire during drawing is higher than that of the surface layer, indicating that the texture plays an important role on the strength of the wire and the gradient along the radial distribution. Displacement density and texture and its distribution can be optimized with a pull-and-pull process to improve wire strength and electrical conductivity.