面剪切織構(gòu)；隨著擠壓道次增加,合金的耐蝕性先增加后降低。等通道轉(zhuǎn)角擠壓對合金耐蝕性的影響是晶粒尺寸、晶體缺陷和織構(gòu)變化的綜合效果；ECAP變形后合金不同截面方向呈現(xiàn)不同的耐蝕性,沿TD方向截面的耐蝕性優(yōu)于另兩個方向的截面。"/>

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等通道轉(zhuǎn)角擠壓對生物Mg-Zn-Ca合金顯微組織與腐蝕行為的影響
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天津理工大學(xué)材料科學(xué)與工程學(xué)院,天津理工大學(xué)材料科學(xué)與工程學(xué)院,天津市鎂勝生物技術(shù)有限公司,天津理工大學(xué)材料科學(xué)與工程學(xué)院

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國家自然科學(xué)基金資助(51271131),天津市科技支撐重點項目(15ZCZDSY00920)及天津市科技特派員項目(16JCTPJC51300)


Effects of ECAP on the microstructure and corrosion behavior of biomedical Mg-Zn-Ca alloy
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School of Materials Science and Engineering,Tianjin University of technology,School of Materials Science and Engineering,Tianjin University of technology,Tianjin Meisheng Biological technology COLTD,School of Materials Science and Engineering,Tianjin University of technology

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    摘要:

    本文旨在探討等通道轉(zhuǎn)角擠壓(equal-channel-angular-pressed,簡稱ECAP) 對生物醫(yī)用Mg-3Zn-0.2Ca合金的顯微組織以及腐蝕行為的影響。通過A路線對鑄態(tài)Mg-3Zn-0.2Ca合金進行了1-4道次的剪切擠壓變形。采用光學(xué)顯微組織觀察、X射線反射法、電化學(xué)等手段研究了擠壓道次對鎂合金顯微組織、織構(gòu)以及腐蝕行為的影響,也特別關(guān)注了ECAP對試樣的不同截面方向的顯微組織演變以及模擬體液(simulated body fluid,簡稱SBF)電化學(xué)腐蝕行為的影響。實驗結(jié)果表明：ECAP變形后鑄態(tài)Mg-3Zn-0.2Ca鎂合金晶粒尺寸逐漸細化,變形后鎂合金呈現(xiàn)出與ED方向呈一定角度的<0 0 2>面剪切織構(gòu)；隨著擠壓道次增加,合金的耐蝕性先增加后降低。等通道轉(zhuǎn)角擠壓對合金耐蝕性的影響是晶粒尺寸、晶體缺陷和織構(gòu)變化的綜合效果；ECAP變形后合金不同截面方向呈現(xiàn)不同的耐蝕性,沿TD方向截面的耐蝕性優(yōu)于另兩個方向的截面。

    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.

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張潤芳,劉德寶,李華,陳民芳.等通道轉(zhuǎn)角擠壓對生物Mg-Zn-Ca合金顯微組織與腐蝕行為的影響[J].稀有金屬材料與工程,2018,47(9):2833~2839.[Zhang Runfang, Liu Debao, Li Hua, 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.]
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  • 收稿日期:2016-10-21
  • 最后修改日期:2017-03-16
  • 錄用日期:2017-04-13
  • 在線發(fā)布日期: 2018-11-01
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