挤压温度对固溶态Mg-2.0Zn-0.5Zr-3.0Gd合金微观组织及耐腐蚀性能的影响
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摘要
利用金相显微镜、扫描电镜及透射电镜等测试手段研究了挤压温度对固溶态Mg-2.0Zn-0.5Zr-3.0Gd镁合金显微组织的影响。同时,采用浸泡实验和电化学测试等方法研究了合金在模拟体液中的腐蚀行为。结果表明:挤压态合金主要由大的变形晶粒和动态再结晶晶粒组成,析出相由纳米级的棒状(Mg,Zn)_3Gd相和颗粒状的Mg_2Zn_(11)相组成。挤压温度在340～360℃时,合金中动态再结晶晶粒的体积分数随着挤压温度的升高而增加,腐蚀速率随着挤压温度的升高而降低。当挤压温度为360℃时,合金发生了完全动态再结晶,具有较好的耐腐蚀性,静态腐蚀速率为0.527 mm/a,腐蚀形式为均匀腐蚀。当温度升高至380℃时,部分动态再结晶晶粒发生异常长大现象,导致腐蚀速率随着挤压温度的升高而升高。
Effects of the extrusion temperature on the microstructure of solution-treated Mg-2.0Zn-0.5Zr-3.0Gd alloys were investigated by a metallographic microscope,a scanning electron microscope and a transmission electron microscope.Moreover,the mass-loss measurement and electrochemical corrosion technique were used to investigate the corrosion behaviors of the alloys in the simulated body fluid.The results show that the extruded alloys are composed of large deformation grains and dynamic recrystallization grains,while the precipitated phases consist of nanoscale rod-like(Mg,Zn)_3Gd and granular Mg_2Zn_(11) phase.With an increase of the extrusion temperature in the range of 340°C to 360°C,the volume fraction of dynamically recrystallized microstructure of the extruded alloys gradually rises,but the corrosion rate progressively decreases.When the extrusion temperature is 360°C,the alloy has a fully dynamic recrystallization,and a better corrosion resistance with a static corrosion rate of 0.527 mm/a,and its corrosion mode is uniform corrosion.When the temperature increases to 380°C,a portion of the dynamically recrystallized grains grow abnormally,which results in an increase of the corrosion rate with increasing the extrusion temperature.
Effects of the extrusion temperature on the microstructure of solution-treated Mg-2.0Zn-0.5Zr-3.0Gd alloys were investigated by a metallographic microscope,a scanning electron microscope and a transmission electron microscope.Moreover,the mass-loss measurement and electrochemical corrosion technique were used to investigate the corrosion behaviors of the alloys in the simulated body fluid.The results show that the extruded alloys are composed of large deformation grains and dynamic recrystallization grains,while the precipitated phases consist of nanoscale rod-like(Mg,Zn)_3Gd and granular Mg_2Zn_(11) phase.With an increase of the extrusion temperature in the range of 340°C to 360°C,the volume fraction of dynamically recrystallized microstructure of the extruded alloys gradually rises,but the corrosion rate progressively decreases.When the extrusion temperature is 360°C,the alloy has a fully dynamic recrystallization,and a better corrosion resistance with a static corrosion rate of 0.527 mm/a,and its corrosion mode is uniform corrosion.When the temperature increases to 380°C,a portion of the dynamically recrystallized grains grow abnormally,which results in an increase of the corrosion rate with increasing the extrusion temperature.
引文
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[4]Zhang Xiaobo(章晓波),Ma Qinglong(马青龙),Ba Zhixin(巴志新)et al.Rare Metal Materials and Engineering(稀有金属材料与工程)[J],2017,46(4):1156
[5]Zhou P,Gong H R.Journal of the Mechanical Behavior of Biomedical Materials[J],2012,8:154
[6]Wang Luning(王鲁宁),Meng Yao(孟瑶),Liu Lijun(刘丽君)et al.Acta Metallurgica Sinca(金属学报)[J],2017,53(10):1317
[7]Gu X N,Zheng Y F,Cheng Y et al.Biomaterials[J],2009,30(4):484
[8]Zhang Xiaobo(章晓波),Mao Lin(毛琳),Yuan Guangyin(袁广银)et al.Rare Metal Materials and Engineering(稀有金属材料与工程)[J],2013,42(6):1300
[9]Yuan Guangyin(袁广银),Niu Jialin(牛佳林).Acta Metallurgica Sinica(金属学报)[J],2017,53(10):1169
[10]Feyerabend F,Fischer J,Holtz J et al.Acta Biomaterialia[J],2010,6(5):1834
[11]Zhang X B,Ba Z X,Wang Z Z et al.Corrosion Science[J],2016,105:68
[12]Gui Z Z,Kang Z X,Li Y Y.Journal of Alloys and Compounds[J],2016,685:222
[13]Ge Q,Mostaed E,Zanella C et al.Rare Metal Materials and Engineering[J],2014,43(11):2561
[14]Zhang X B,Wu Y J,Xue Y J et al.Materials Letters[J],2012,86(1):42
[15]Zhang X B,Ba Z X,Wang Z Z et al.Materials Letters[J],2016,163:250
[16]Liu K,Zhang J H,Rokhlin L L et al.Materials Science and Engineering A[J],2009,505(1-2):13
[17]Li C J,Sun H F,Li X W et al.Journal of Alloys and Compounds[J],2015,652:122
[18]Cao F Y,Shi Z M,Song G L et al.Corrosion Science[J],2015,90:176
[19]Yuan Guangyin(袁广银),Zhang Xiaobo(章晓波),Niu Jialin(牛佳林)et al.The Chinese Journal of Nonferrous Metals(中国有色金属学报)[J],2011,21(10):2476
[20]Liu S J,Yang G Y,Luo S F et al.Journal of Alloys and Compounds[J],2015,644:846
[21]Jeong Y S,Kim W J.Corrosion Science[J],2014,82:392
[22]Shi Z M,Liu M,Atrens A.Corrosion Science[J],2010,52(2):579
[23]Huang K,LogéR E.Materials and Design[J],2016,111:548
[24]He Z L,Fu P H,Wu Y J et al.Materials Science and Engineering A[J],2013,587:72
[25]Zhang J S,Zhang W B,Bian L P et al.Materials Science and Engineering A[J],2013,585:268
[26]Robson J D,Henry D T,Davis B.Acta Materialia[J],2009,57(9):2739
[27]Sun H F,Li C J,Fang W B.Journal of Materials Processing Technology[J],2016,229:633
[28]Hou X L,Cao Z Y,Wang L D et al.Material Science and Engineering A[J],2011,528:7805
[29]Liao J S,Hotta M,Yamamoto N.Corrosion Science[J],2012,61:208
[30]Aung N N,Zhou W.Corrosion Science[J],2010,52:589
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