弥散相对铝合金冷轧过程中晶粒分裂和织构演变的影响

制备了2种含有相近合金元素含量但不同的弥散第二相密度的铝锰合金冷轧板材。利用背散射电子衍射和取向成像图技术研究了晶粒分裂和微观织构，使用X射线衍射技术测量了宏观织构。研究发现当应变达到3左右时，高密度的小尺寸弥散相会促进铜型和S型织构的形成，同时增加了大角晶界所占比例。在小应变下，弥散相对织构和大角晶界的影响不显著。研究显示弥散相通过钉扎晶界从而促进织构演化，进而影响晶粒分裂和大角晶界的形成。

Influence of dispersoids on grain subdivision and texture evolution in aluminium alloys during cold rolling

Al-Mn alloys containing similar amounts of solutes but various dispersoid densities were cold rolled. The grain subdivision and micro-texture were examined by electron backscatter diffraction and orientation imaging microscopy. Macro-texture was measured by X-ray diffraction. It is found that a high density of fine dispersoids enhances the development of the copper and S textures at large strains （～3）, and also induces a higher fraction of high-angle grain boundaries. At smaller strains, the texture and high-angle grain boundaries are not evidently influenced by the density of dispersoids. It is suggested that the texture evolution, which is enhanced by dispersoid pinning effect, contributes to the grain subdivision and the formation of high-angle grain boundaries.