变温等通道角挤压对Mg-Zn-Mn合金组织与性能的影响  

Effects of Variable Temperature Equal Channel Angular Pressing on Microstructure and Properties of Mg-Zn-Mn Alloy

作　　者：李浩 宋言红 唐馨 

机构地区：[1]西南交通大学机械工程学院,四川成都610031 [2]成都拜尔麦迪克医疗科技有限公司,四川成都610000 [3]西南交通大学材料科学与工程学院,四川成都610031

出　　处：《热加工工艺》2017年第23期69-72,共4页Hot Working Technology

摘　　要：对比研究了Mg-Zn-Mn合金在230℃恒温挤压与经230→210→190℃的降温挤压。发现降温挤压工艺在晶粒细化效果和提高材料硬度方面均强于恒温挤压工艺。基于此,采用降温挤压工艺进行了4道次挤压试验,各道次挤压温度分别为220、200、190、185℃。将挤压后的试样金相组织与原始未挤压试样作了对比分析,并对各道次样品进行了浸泡及拉伸试验,观察了降温等通道挤压对晶粒的细化作用及其对材料性能的影响。结果表明:经降温挤压之后,镁合金晶粒细化效果较好,挤压4道次后晶粒尺寸已接近亚微米级,组织均匀化效果明显。在力学性能改善的同时材料的耐腐蚀性能提高。Constant temperature extrusion at 230℃ and reducing temperature （230 → 210 → 190℃ ） extrusion of Mg-Zn-Mn alloy were contrasted and studied. It is found that the reducing temperature extrusion process is superior to the constant temperature extrusion technology in the grain refinement effect and the increasing the material hardness. Based on this, the 4 passes extrusion test was carried out by using the reducing temperature extrusion process, and the extrusion temperature of each pass was 220,200,190 and 185℃, separately. The microstructure of the samples after extrusion was compared with that of the original sample, soaking and tensile experiments for each sample were carried out, and the effects of reducing temperature equal channel extrusion on the grain refinement and the properties of the material were investigated. The results show that after reducing temperature extrusion, the grain refinement effect of the magnesium alloy is better. After 4 times extrusion, the grain sizes are close to sub-micron, and the effect of microstructure homogenization is obvious. While the mechanical properties are improved, the corrosion resistance of the material is improved.

关 键 词：Mg-Zn-Mn镁合金 等通道角挤压 耐腐蚀性能 微观组织 

分 类 号：TG379[金属学及工艺—金属压力加工]