挤压和等通道角挤压制备高强度Mg_(97)Y_2Zn_1镁合金  

High strength Mg_(97)Y_2Zn_1 alloy processed by extrusion and equal channel angular pressing

作　　者：陈彬[1,2,3,4] 林栋樑[1] 曾小勤[1,3,4] 卢晨[1,3] 彭颖红[2] 

机构地区：[1]上海交通大学材料科学与工程学院,上海200240 [2]上海交通大学机械与动力工程学院,上海200240 [3]上海交通大学轻合金精密成型国家工程研究中心,上海200240 [4]上海交通大学金属基复合材料国家重点实验室,上海200240

出　　处：《中国有色金属学报》2010年第4期613-619,共7页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目(50471015)

摘　　要：采用常规挤压和等通道角挤压工艺加工得到高强度Mg97Y2Zn1镁合金。结果表明:常规挤压后,镁合金晶粒尺寸为0.5～2.0μm,屈服强度、抗拉强度和伸长率分别达到352MPa、413MPa和10%。常规挤压后再经过等通道角挤压,晶粒尺寸被进一步细化到300～400nm,屈服强度和抗拉强度进一步提高到400MPa和450MPa。在铸态、常规挤压态和等通道角挤压态的Mg97Y2Zn1合金中,都发现有长周期有序的精细层状结构存在,其产生与基体中溶有少量Y和Zn元素有关。晶粒细化和精细层状结构的存在是材料高强度的原因。The high strength Mg97Y2Zn1 alloy processed by extrusion and equal channel angular pressing was investigated.The results show that after extrusion,the processed Mg97Y2Zn1 alloy obtains ultrafine grains with average grain size of 0.5-2.0 μm,and exhibits excellent mechanical properties with yield strength,ultimate tensile strength and elongation of alloy of 352 MPa,413 MPa and 10%,respectively.After extrusion and equal channel angular pressing,the average grain size is 300-400 nm,the yield strength and ultimate tensile strength of the alloy are 400 MPa and 450 MPa,respectively.The long-period stacking lamellar structure is observed in the as-cast,extruded and ECAP processed Mg97Y2Zn1 alloy,the formation of which is due to the solid solution of Y and Zn.The excellent mechanical properties of Mg97Y2Zn1 alloy are attributed to the grain refinement and the long-period stacking structure.

关 键 词：镁合金 Mg97Y2Zn1 等通道角挤压 力学性能 高强度 长周期有序结构 

分 类 号：TG146.2[一般工业技术—材料科学与工程]