陈吉华1,2,邹正阳1,2,严红革1,2,苏斌1,2,邰辉辉1,巩晓乐1,黄姜凌1.Ca对医用Mg-4Zn合金轧制板材组织与性能的影响[J].湖南大学学报:自然科学版,2017,44(12):27~33
Ca对医用Mg-4Zn合金轧制板材组织与性能的影响
Effects of Ca Addition on Microstructure and Properties of theAs-rolled Mg-4Zn Alloy Plate for Biomedical Application
  
DOI:
中文关键词:  Mg-Zn-Ca合金  高应变速率轧制  耐生体腐蚀性能  剩余抗拉强度
英文关键词:Mg-Zn-Ca alloy  high strain-rate rolling  corrosion resistance  residual tensile strength
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作者单位
陈吉华1,2,邹正阳1,2,严红革1,2,苏斌1,2,邰辉辉1,巩晓乐1,黄姜凌1 (1.湖南大学 材料科学与工程学院湖南 长沙 4100822.湖南省喷射沉积技术及应用重点实验室湖南 长沙 410082) 
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中文摘要:
      采用金相分析、扫描电镜分析和拉伸测试等手段研究了Ca含量(质量分数03%,0.6%和0.9%)对高应变速率轧制Mg 4Zn基合金板材显微组织、力学性能和耐生体腐蚀性能的影响.结果表明:加入Ca可以细化Mg 4Zn合金的动态再结晶晶粒,导致合金中残余第2相的含量增加和尺寸增大,并提高其抗拉强度和屈服强度.其中,Mg 4Zn 0.9Ca合金的抗拉强度和屈服强度分别为300 MPa和278 MPa,比基体合金分别提高了12.4%和68.5%.然而,合金的耐腐蚀性能和剩余抗拉强度随着Ca含量的增加而下降,可归因于合金中残余第2相含量的增加以及尺寸增大.Mg 4Zn合金板材中第2相比较细小、分布均匀,倾向于均匀腐蚀,在0.9%NaCl溶液中浸泡7 d的平均腐蚀速率为0.80 mg/(cm2·d),浸泡7 d,15 d后的剩余抗拉强度分别为217 MPa和205 MPa.
英文摘要:
      Effects of Ca addition (0.3%,0.6% and 0.9mass%) on microstructure,mechanical properties and bio-corrosion resistance of the Mg-4Zn based alloys prepared by high strain-rate rolling were investigated by OM,SEM,tensile testing and etc. Ca can refine the dynamic recrystallization grains of the as-rolled alloys,increase the content and the size of the residual second phases,and thus improve the ultimate tensile strength and yield strength. The ultimate tensile strength and the yield strength of Mg-4Zn-0.9Ca are 300MPa and 278MPa respectively,about 12.4% and 68.5% higher than Mg-4Zn. However,corrosion resistance and residual tensile strength decrease with the increasing Ca content,resulting from the higher content and the bigger size of the residual second phases. The bio-corrosion of the Mg-4Zn alloy is uniform since the second phase particles are fine and homogenously distributed. The average corrosion rate immersed in 0.9% NaCl for 7 days is 0.80 mg/(cm2·d)and the residual tensile strength immersed in 0.9% NaCl for 7 and 15 days are 217 MPa and 205 MPa,respectively.
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