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张润芳,刘德宝,李华,陈民芳.等通道转角挤压对生物Mg-Zn-Ca合金显微组织与腐蚀行为的影响[J].稀有金属材料与工程(英文),2018,47(9):2833~2839.[Zhang Runfang,Liu Debao,Li Hua and Chen Minfang.Effects of ECAP on the microstructure and corrosion behavior of biomedical Mg-Zn-Ca alloy[J].Rare Metal Materials and Engineering,2018,47(9):2833~2839.]
Effects of ECAP on the microstructure and corrosion behavior of biomedical Mg-Zn-Ca alloy
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Received:October 21, 2016  Revised:March 16, 2017
DOI:
Key words: ECAP process  Mg-3Zn-0.2Ca alloy  microstructure  texture  corrosion behavior
Foundation item:国家自然科学基金资助(51271131),天津市科技支撑重点项目(15ZCZDSY00920)及天津市科技特派员项目(16JCTPJC51300)
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Zhang Runfang,Liu Debao,Li Hua and Chen Minfang  
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Abstract:
      The purpose of this paper is to explore the effects of equal-channel angular pressed (ECAP) process on the microstructure and corrosion behavior of biomedical Mg-Zn-Ca Alloy. As-cast Mg-3Zn-0.2Ca alloy was extruded for 1-4 passes by ECAP using route A process. The influences of ECAP process on the microstructure, texture and corrosion behavior of Mg-3Zn-0.2Ca alloy were investigated by optical microstructure observation, X-ray reflection and electrochemical methods. Particularly, the effects of ECAP process on the microstructure evolution and electrochemical corrosion behavior in simulated body fluid on the different cross-section of ECAPed alloy. The results indicated that with increasing ECAP passes, grain size of Mg-3Zn-0.2Ca alloy gradually refined, and (0002) basal texture emerged after ECAP 4 passes. With increasing ECAP passes, the corrosion resistance of Mg-3Zn-0.2Ca alloy increased firstly and then decreased. The influence of ECAP process on corrosion resistance of Mg-3Zn-0.2Ca was the combined action of grain size, crystal defect and texture. The corrosion resistance of ED, TD and ND cross-section of ECAPed alloy were different, and the corrosion resistance of TD section is superior to the other two directions.