高纯铜冷轧形变组织及织构演变规律研究

摘要

采用纯度99.99%的高纯铜进行30%、50%、70%、90%形变量冷轧加工,对不同形变量下高纯铜的晶粒尺寸、分布等微观组织及织构进行了定量研究.结果发现,随着形变量的增加,平均晶粒尺寸、晶粒尺寸方差不断减小,晶粒高宽比(形状因子)逐渐增加,晶粒逐渐转变为纤维状;冷轧织构(Brass、S、Copper)含量逐渐增加,其中Brass织构最多,S织构次之,Copper织构最少.形变量至90%后,冷轧织构含量增至85%以上,晶粒逐渐向标准极射三角形中间部位聚集,在{101}方向有显著聚集,{111}方向始终无明显聚集.α取向线及β取向线上织构含量逐渐增加,均出现明显的集中织构,形变量从70%增加至90%时织构的增加最明显.%The high purity copper(99. 99％) was cold rolled with 30％, 50％, 70％, 90％ reduction, the grain size distribution, deformed microstructure and texture were quantitatively characterized. It shows that average grain size and its square deviation decrease with increased reduction, while aspect ratio increases, deformed grains develop into lamellar. Cold rolling textures (Brass, S, and Copper) also increase, Brass texture increases most following with S and then Copper texture. Cold textures volume fraction increases to 70％ with 90％ reduction, the orientations move to the middle of the inverse pole figure gradually, focusing on the [101] but never [111]. α and β texture increase and trend to focus on some orientations with increased reduction, the increment of α and β texture is the biggest when reduction increases from 70％ to 90％