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采用喷射沉积技术制备Mg-9Al-3Zn-1Mn-6Ca-2Nd合金沉积坯,对其进行挤压预变形和轧制变形(温度T=350℃;道次压下率e=20%,25%,30%).利用SEM,TEM和XRD研究二次变形对尺寸不对称挤压坯中织构演变及LPSO相形成的影响.结果表明:镁合金板坯经350℃和道次压下率为20%轧制后,在(Ca,Nd)Al2结构C15型Laves相基体形成24R结构Mg-Nd-Zn型LPSO相;随着轧制变形程度增大(e=20%,25%,30%)实现了形变织构的随机化,纳米级C15粒子钉扎位错与亚晶引起的再结晶的共同作用是导致基面织构(0002),柱面织构{1010}<0001>及锥面织构{1012}全面启动的主要原因.
Deposition and rolling deformation of Mg-9Al-3Zn-1Mn-6Ca-2Nd alloy was carried out by spray deposition (temperature T = 350 ℃; pass reduction rate e = 20%, 25% , 30%). The effects of secondary deformation on the texture evolution and LPSO phase formation in asymmetric extrusion billets were investigated by SEM, TEM and XRD. The results showed that the reduction rate of magnesium alloy billets at 350 ℃ and pass reduction was After 20% rolling, the 24R structure Mg-Nd-Zn type LPSO phase was formed on the (Ca, Nd) Al2 C15 Laves phase matrix. With the rolling deformation increasing (e = 20%, 25%, 30% ) To achieve random texture deformation, nanoscale C15 particle pinning dislocation and subgrain caused by the recrystallization of the common cause is the base texture (0002), the cylinder {1010} <0001> texture and cone Surface texture {1012} The main reason for full activation.