挤压对Mg-Mn-Zn合金力学性能和腐蚀行为的影响  

Effcet of extrusion on mechanical properties and corrosion behavior of Mg-Mn-Zn alloy

作　　者：尹冬松[1] 张二林[2] 曾松岩[1] 

机构地区：[1]哈尔滨工业大学材料科学与工程学院,黑龙江哈尔滨150001 [2]中国科学院金属研究所,辽宁沈阳110016

出　　处：《材料热处理学报》2009年第1期114-118,共5页Transactions of Materials and Heat Treatment

基　　金：中科院“百人计划项目”,“医用金属植入材料”(AM07-YC13)

摘　　要：研究了铸态和挤压态Mg-Mn-Zn合金的微观组织、力学性能和在模拟人体体液中的腐蚀行为。结果表明:铸态Mg-Mn-Zn合金的平均晶粒尺寸为300μm;而挤压后Mg-Mn-Zn合金的平均晶粒尺寸降低为9μm。挤压态与铸态Mg-Mn-Zn合金相比,抗拉强度由174.5MPa提高到280.2MPa,屈服强度由43.6MPa提高到246.5MPa,伸长率达到21.6%。铸态Mg-Mn-Zn合金断口呈脆性断裂,挤压态合金为韧性断裂。挤压态Mg-Mn-Zn合金的耐蚀性能也明显高于铸态Mg-Mn-Zn合金。The microstructure, mechanical properties and the corrosive behavior in simulated body fluid of as-cast and extruded Mg-Mn-Zn alloy were investigated. The results show that the average grain size of as-east Mg-Mn-Zn alloy is 300μm and that of extruded alloy is 9μm. Compared with the as-cast alloy, the tensile strength of the extruded ahoy increases from 174.5MPa to 280.2MPa, the yield strength increases from 43.6MPa to 246.5MPa, and the elongation reaehs about 21.6% . The tensile fracture of as-cast Mg-Mn-Zn alloy is brittle fracture while that of extruded alloys exhibits ductile fracture. The corrosion resistance of the extruded ahoy is also superior to that of as-cast alloy.

关 键 词：镁合金 挤压 力学性能 模拟体液 腐蚀 

分 类 号：TG146.22[一般工业技术—材料科学与工程]