合金元素及孔结构对Gasar镁合金力学性能及耐腐蚀性能的影响  

Effects of Alloying Element and Pore Structure on Mechanical Property and Corrosion Properties of Gasar Mg Alloys

作　　者：周灿旭 刘源[1,2] Zhou Canxu;Liu Yuan(School of Materials Science and Engineering,Tsinghua University,Beijing 100084,China;Key Laboratory for Advanced Materials Processing Technology,Ministry of Education,Tsinghua University,Beijing 100084,China)

机构地区：[1]清华大学材料学院,北京100084 [2]清华大学先进成形制造教育部重点实验室,北京100084

出　　处：《稀有金属材料与工程》2022年第2期637-644,共8页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51771101)。

摘　　要：采用金属-气体共晶定向凝固法("Gasar"工艺)制备藕状多孔Mg-Mn、Mg-Mn-Zn系合金,并研究合金元素和孔结构对藕状多孔镁合金力学性能及耐腐蚀性能的影响。结果表明:1%Mn(质量分数)的添加,可以使藕状多孔纯镁的抗压缩强度从64 MPa(孔隙率约36%)提升至74 MPa(孔隙率约41.2%),而进一步添加1%的Zn元素,材料的抗压缩强度增至115MPa(孔隙率约37%)。Zn元素的加入可以提高藕状多孔Mg-Mn合金的耐腐蚀性能。同时,藕状多孔Mg-1%Mn-1%Zn合金定向孔下方的圆锥状溶质富集区表现出良好的耐腐蚀性。孔径对藕状多孔材料耐腐蚀性能有一定的影响,当孔径尺寸为1026μm时,GasarMg-1%Mn合金孔壁腐蚀较为严重,而当孔径降至306μm时,孔会被腐蚀产物封闭,孔壁的腐蚀程度较小。Lotus-type porous Mg-Mn and Mg-Mn-Zn alloys were fabricated by metal-gas eutectic unidirectional solidification(the Gasar method). Effects of elements on the mechanical properties and corrosion properties of porous Mg alloy were studied. The results show that the addition of 1 wt% Mn could increase the compressive strength of pure Mg from 64 MPa(porosity ~36%) to 74 MPa(porosity ~37%),and the compressive strength of the porous material could be increased to 115 MPa(porosity ~37%) by adding 1 wt% Zn to Mg-Mn alloy.Addition of Zn can effectively improve the corrosion resistance of Gasar Mg-Mn alloy. Conical solute enrichment area near the pore bottom of Gasar Mg-1 wt%Mn-1 wt%Zn alloy shows good corrosion resistance. Pore structure can affect the corrosion resistance of Gasar materials. When the average pore diameter is 1026 μm, the corrosion of the pore wall in Mg-1 wt%Mn alloy is more serious. While the average pore diameter is decreased to 306 μm, the pore of the samples would be blocked by corrosion products, and the corrosion degree of pore walls is less.

关 键 词：Gasar工艺 镁合金 可降解生物材料 力学性能 耐腐蚀性能 

分 类 号：TG146.22[一般工业技术—材料科学与工程] TB383[金属学及工艺—金属材料]