【摘要】 采用硬度测量、透射电镜和X射线衍射等试验方法,探讨了在室温不同强塑性变形下A l-Zn-Mg-Cu、A l-Cu、A l-Mg-Si三种铝合金时效析出相的演变。结果表明,强烈塑性变形能引起绝大部分析出相产生室温回溶,形成过饱和固溶体;每种析出相再溶解的次序不同,先驱相(如GP区、亚稳相)回溶所属的变形程度小于稳定相。更多还原

【Abstract】 The re-dissolution of precipitation phases of Al-Zn-Mg-Cu,Al-Cu and Al-Mg-Si alloys at room temperature caused by severe compressed deformation was researched by hardness measurement,X-ray diffraction analysis and transmission electron microscopy.The results show that supersaturated solid solutions are formed after re-dissolution of precipitated phases induced by drastically deformation at room temperature,moreover,the deformation extents of initial re-dissolution all are different owing to various precipitates.The re-dissolution of precursor phases(such as GP zone,metastable phases) is easier than that of equilibrium phases,and their deformed extent needed by re-dissolution is smaller.更多还原