固溶处理对Mg-Zn-Y-Zr-Ca生物镁合金组织及腐蚀性能的影响  

Effects of solution treatment on microstructure and corrosion properties of Mg-3.0Zn-0.6Y-0.5Zr-0.3Ca biological magnesium alloy

作　　者：孙毅[1,2] 张文鑫 许春香[1,2] 张金山 韩少兵[1,2] 贾长建 

机构地区：[1]太原理工大学材料科学与工程学院,山西太原030024 [2]先进镁基材料山西省重点实验室,山西太原030024

出　　处：《材料热处理学报》2017年第9期24-29,共6页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金(51574175;51474153)

摘　　要：采用光学显微镜(OM)、扫描电镜(SEM)、X射线衍射仪(XRD)及电化学工作站等设备,研究了固溶理对Mg-3.0Zn-0.6Y-0.5Zr-0.3Ca(质量分数,%)合金显微组织及生物腐蚀性能的影响。结果表明:铸态合金的显微组织由α-Mg枝晶、条状Mg_3YZn_6相和球状Ca_2Mg_6Zn_3组成。随着固溶温度(360~450℃)的升高,合金中的析出相逐渐溶解,同时,组织中有富Zr新相析出。电化学测试结果表明,合金经420℃×24 h固溶处理后,其腐蚀电位和腐蚀电流密度分别为-1.468 V和8.943μA/cm^2,显示出优异的耐蚀性能,这主要归因于低的第二相体积分数和细小的晶粒尺寸。Effects of solution treatment on microstructure and corrosion properties of Mg-3.0Zn-0.6Y-0.5Zr-0.3Ca（ mass,%） biological magnesium alloy were investigated by means of optical microscope（ OM）,scanning electron microscope（ SEM）,X-ray diffraction（ XRD）and electrochemical test.The results show that the as-cast alloy consists of α-Mg dendrite,strip-like I（ Mg_3YZn_6） phase and globular Ca_2Mg_6Zn_3 phase.With the increasing of the solution temperature（ 360-450 ℃）,the precipitated phases of the alloy is gradually dissolved into the matrix,and the new Zr-rich phase is formed.In addition,the electrochemical test results indicate that the alloy solution treated at 420 ℃ for 24 h exhibits excellent corrosion resistance,which is mainly attributed to the low volume fraction of precipitated phases and the fine grain size,and the corrosion potential and corrosion current are-1.468 V and 8.943 μA/cm^2,respectively.

关 键 词：生物镁合金 固溶处理 Mg3YZn6准晶相 微观组织 腐蚀性能 

分 类 号：TG146.2[一般工业技术—材料科学与工程]