| 渗注磷酸盐对AZ31镁合金疲劳裂纹扩展的影响 |
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| 引用本文： | 贺显聪,王章忠,白允强,巴志新,李晓泉,沈鸿烈.渗注磷酸盐对AZ31镁合金疲劳裂纹扩展的影响[J].中国有色金属学报,2011(8). |
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| 作者姓名： | 贺显聪 王章忠 白允强 巴志新 李晓泉 沈鸿烈 |
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| 作者单位： | 南京工程学院材料工程学院;南京航空航天大学材料科学与技术学院; |
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| 基金项目： | 江苏省高校自然科学基础研究项目(07KJB430036); 江苏省自然科学基金资助项目(BK2009354); 南京工程学院基金资助项目(KXJ08053,KXJ08003) |
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| 摘 要： | 交变载荷作用下在AZ31镁合金疲劳裂纹尖端渗注磷酸盐转化液,研究磷酸盐的沉积行为及其对AZ31镁合金疲劳裂纹扩展速率的影响。采用扫描电镜(SEM)、能谱仪(EDS)、X射线衍射仪(XRD)观察分析裂纹尖端的形貌和物相组成,并采用贴应变片方法确定渗注磷酸盐转化液前后应力强度因子的变化。结果表明:渗注的磷酸盐转化液在AZ31镁合金疲劳裂纹尖端形成Zn3(PO4).4H2O及MgZnP2O7复合覆层,能改变疲劳裂纹尖端的应力大小和分布状态,使应力强度因子降低约30%,从而有效地增强疲劳裂纹闭合效应,降低或延滞AZ31镁合金疲劳裂纹的扩展。
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| 关 键 词： | AZ31镁合金 磷酸盐 疲劳裂纹扩展 疲劳裂纹闭合 |
Effects of immersing phosphate on fatigue crack propagation in AZ31 magnesium alloy |
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| HE Xian-cong,WANG Zhang-zhong,BAI Yun-qiang,BA Zhi-xin,LI Xiao-quan,SHEN Hong-lie.Effects of immersing phosphate on fatigue crack propagation in AZ31 magnesium alloy[J].The Chinese Journal of Nonferrous Metals,2011(8). |
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| Authors: | HE Xian-cong WANG Zhang-zhong BAI Yun-qiang BA Zhi-xin LI Xiao-quan SHEN Hong-lie |
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| Affiliation: | HE Xian-cong1,2,WANG Zhang-zhong1,BAI Yun-qiang1,BA Zhi-xin1,LI Xiao-quan1,SHEN Hong-lie2 (1.School of Material Engineering,Nanjing Institute of Technology,Nanjing 211167,China,2.College of Material Science and Technology,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China) |
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| Abstract: | Under alternate loads,a phosphate liquid was immersed into the fatigue crack tip of AZ31 magnesium alloy,the phosphate deposition behavior and effects of the phosphate film on the fatigue crack propagation rate at the fatigue crack tip of AZ31 magnesium alloy were investigated.The morphologies and phase constitutions of the phosphate deposition at the fatigue crack tip were characterized by scanning electron microscopy(SEM),energy spectrum analysis(EDS) and X-ray diffractometry(XRD),respectively.The stress-... |
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| Keywords: | AZ31 magnesium alloy phosphate fatigue crack propagation fatigue crack closure |
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