采用TEM和EBSD研究变形量和变形温度对冷拔铝线材的显微组织和纤维织构演变的影响.结果表明,在低应变量下,随着应变量的增加,低角度界面数量增加而高角度界面数量减少.在高应变量下,绝大部分晶界和位错界面与冷拔方向平行.但是在高应变量下,随着应变量的增大,低角度界面数量减少而高角度界面数量增加.降低形变温度会导致显微组织细化,低角度界面数量增加.织构分析表明,随着应变量的增大,复杂织构组分的体积分数降低,在高应变量下形成<111>和<100>混合织构.在低应变下,<111>织构组分比较稳定,而在高应变下,<100>织构组分趋于稳定.降低形变温度使<111>织构组分在高应变下的稳定性增强.
The effect of strain and drawing temperature on the evolution of microstructure and fiber textures of aluminum wires drawn at room temperature and cryogenic temperature was investigated by TEM and EBSD observations. The results show that low angle boundaries frequency increases and high angle boundaries frequency decreases with strain increasing when the strain is low. At high strain, most of grain and dislocation boundaries are parallel to the drawn direction and low angle boundaries frequency decreases and high angle boundaries frequency increases with strain increasing. The decrease of deformation temperature leads to microstructure finer and low angle boundaries frequency increasing. Texture analysis indicates that volume fraction of complex texture component decreases with strain increasing and a mixture of <111> and <100> fiber texture forms at high strain. <111> is stable at low strains but <100> becomes stable at high strain. The decrease of temperature can enhance the stability of <111> orientation at high strain.
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