热挤压和时效处理对生物可降解Mg-Zn-Y合金性能的影响（英文）  

Influence of Hot Extrusion and Aging Treatment on the Properties of Biodegradable Mg-Zn-Y Alloy

作　　者：乔雪岩 余琨[1,2] 陈良建[3] 戴翌龙[1] 肖涛[4] 邓幼文[4] 颜阳[1] Qiao Xueyan1,2, Yu Kun1,2, Chen Liangjian3, Dai Yilong1, Xiao Tao4, Deng Youwen4, Yan Yang1(1 Central South University, Changsha 410083, China; 2 Yantai Nanshan University, Yantai, 265713, China; 3Xiangya Third Hospital, Central South University, Changsha 410083, China; 4 Xiangya Second Hospital, Central South University, Changsha 410083, Chin)

机构地区：[1]中南大学,湖南长沙410083 [2]烟台南山学院,山东烟台265713 [3]中南大学湘雅三医院,湖南长沙410083 [4]中南大学湘雅二医院,湖南长沙410083

出　　处：《稀有金属材料与工程》2018年第3期773-779,共7页Rare Metal Materials and Engineering

基　　金：National Natural Science Foundation of China(81472058);Fundamental Research Funds for the Central Universities of Central South University(621020094);Shandong Province Project of Outstanding Subject Talent Group;the Innovation Project of Graduate Students,Central South University,China(2014zzts172)

摘　　要：采用粉末冶金法制备了Mg-6%Zn-1%Y生物医用镁合金并进行了热挤压变形处理。挤压后的样品在150℃下分别时效24和72h。对实验用合金的显微组织和腐蚀行为进行了研究。显微组织结果表明,合金包含α-Mg、MgZn、MgZn_2和Mg_3YZn_6(I相)。热挤压工艺显著细化晶粒并提高了合金的力学性能和耐腐蚀性能。其中热挤压后合金的压缩强度在365~399MPa之间,且浸泡实验中的析氢量低于烧结态合金。另外,由于更均匀的腐蚀行为,时效72h的合金分别在浸泡实验和动电位极化实验中显示出更低的腐蚀速率和腐蚀电流密度,并在电化学阻抗谱(EIS)中获得了较高的电阻值(R_p)。结果表明,时效72h合金较其他3种合金具有更优异的腐蚀性能。Mg-6Zn-1Y （mass fraction, %） alloys were prepared for degradable biomaterials. The billets of the alloy were produced by powder metallurgy （PM） method and then hot extruded. The extruded samples were aged for 24 and 72 h at 150 ℃. The microstructure and corrosion behavior of the experimental alloys were investigated. The microstructure observations indicate that the alloys contain α-Mg, MgZn, MgZn_2 and Mg_3YZn_6 （I-phase） phases. The hot extrusion process significantly refines the grains and leads to better mechanical properties with the value of compressive strength in the range of 365～399 MPa, and better corrosion resistance for the PM alloy shows higher hydrogen volume in the immersion test. Furthermore, due to more uniform corrosion behavior, the alloy aged for 72 h presents lower corrosion rate and corrosion current density in the immersion test and potentiodynamic polarization test, and higher resistance value （R_p） results from the electrochemical impedance spectroscopy （EIS）, which means the alloy aged for 72 h exhibits better corrosion resistance than the other three alloys.

关 键 词：镁合金 生物材料 挤压 时效 腐蚀性能 力学性能 

分 类 号：TG146.22[一般工业技术—材料科学与工程] TG166.4[金属学及工艺—金属材料] TG379[金属学及工艺—金属学]