(1. 河南理工大学 材料科学与工程学院,焦作 454000;
2. 河南理工大学 经济管理学院,焦作 454000)
摘 要: 利用往复挤压在300~360 ℃细化铸态Mg-6Zn-1Y-1Ce合金组织,研究其组织演变和挤压参数对再结晶组织的影响。结果表明:往复挤压合金横截面边缘存在不均匀环,由靠近筒壁的细晶环和粗晶环组成,其宽度随着挤压温度提高而减小;细晶环是由边缘区域与挤压筒壁摩擦而发生第二轮再结晶所致,粗晶环是由再结晶晶粒长大所致;合金晶粒度由变形速率和温度决定,经340 ℃挤压合金晶粒最细,平均粒径8.2 μm。除边缘外,往复挤压过程中合金在挤压阶段发生一次再结晶,墩粗过程和后续多道次挤压变形都是通过晶界滑移实现。因此,随着挤压道次的增加,保温时间随之延长,晶粒随之被粗化。
关键字: 镁合金;往复挤压;再结晶;挤压参数
(1. School of Materials Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China;
2. School of Economic and Management, Henan Polytechnic University, Jiaozuo 454000, China)
Abstract:The microstructure of as-cast Mg-6Zn-1Y-1Ce alloy was refined by reciprocating extrusion (REX) at the temperature range of 300-360 ℃, the microstructural evolution and the effect of extrusion parameters on recrystallized microstructure were investigated. The results show that the as-REXed alloys have an inhomogeneous ring on cross section, which consists of a fine-grain ring and a coarse-grain ring on the periphery. The width of the ring decreases with increasing the extrusion temperature. The fine-grain ring is attributed to the secondary recrystallization occurring because of friction between the periphery of sample and container wall, the coarse-grain ring is attributed to grain growth followed recrystallization. The grain size of REXed alloy is determined by deformation rate and temperature, a minimum grain size of 8.2 μm is obtained at 340 ℃. During REX process, recrystallization occurs only once during extrusion except for the periphery, the deformation processes during upsetting and subsequent multi-pass REX are achieved by grain boundary sliding. Therefore, with increasing REX passes, the holding-time is prolonged and grains coarsen.
Key words: magnesium alloy; reciprocating extrusion; recrystallization; extrusion parameter