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热处理 工艺 镁合金 耐磨 性能 影响 研究 黄河

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热处理工艺对镁合金耐磨性能影响的研究（黄河）,热处理,工艺,镁合金,耐磨,性能,影响,研究,黄河

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黄河科技学院毕业论文 第 IV 页 热处理工艺对镁合金耐磨性能影响的研究摘 要镁合金作为21世纪最有发展潜力的绿色轻质材料正在越来越受到广大科研工作者的关注。但是作为广泛使用的镁合金AZ91D，其高温性能却并不理想。热处理对镁合金耐磨性的影响已受到广泛关注。 本文采用销盘式磨损机对AZ91D镁合金进行干滑动磨损实验。研究不同热处理条件镁合金的摩擦磨损性能，采用光学显微镜、硬度试验等研究了合金固溶时效处理后的微观组织和磨损性能，探讨了AZ91D镁合金的磨损机制。研究表明热处理后挛晶消失、组织逐渐趋于均匀化 、平均晶粒尺寸变小。随着固溶处理时间的延长，AZ9lD镁合金中的-Mg17Al12相逐渐分解并溶入-Mg基体相中。继续延长固溶处理时间，AZ91D镁合金中的合金元素在扩散机制的作用下趋向均匀。时效处理时-Mg17Al12相脱溶析出。关键词：AZ91D镁合金,热处理，耐磨性，微观组织，固溶处理，时效处理，磨损机制The Study of The Effect of Heat treatment on wear-resisting property of Magnesium Alloy Author : Du FenTutor: Zhang BaofengAbstractAs a light and green material with latent capacity of development in the 21 century,magnesium alloys became more and more popular within the material fieldAlthough it is a widely used magnesium alloy,mechanical properties of magnesium alloy AZ91D at elevated temperature was not good enoughDry sliding weal tests were performed on AZ91D magnesium alloy as well using a pinon-disc wear machine in different experimental conditionsProperties of frictional wear of different kind Heat treatment of alloy were studied at the same timeMicrostructure and wear-resisting properties of the alloy were investigated by means of OM,hardness test。After solid solution treatment and aging treatment. The wear mechanism of AZ91D magnesium alloy was also discussedThe study shows that:the grains turned homogeneous and fine after heat treatment.With the extension of solid solution treatment time，-Mg17Al12-phase in AZ91D decomposed gradually and dissolved in -Mg-phase. Continue to extend the treatment time，the alloying elements in the alloy approached to a uniform state because of the proliferation mechanism. -Mg17Al12-phase in AZ91D exsolution and precipit from -Mg-phase.Key words: AZ91D magnesium,Heat treatment,Wear-resisting property,Microstructure,Solution treatment,Aging treatment,Wear mechanism目 录1 绪 论11.1引言11.2 镁合金热处理方法和特点11.2.1 退火21.2.2 固溶处理31.2.3 固溶处理+人工时效31.2.4 人工时效41.2.5 表面热处理51.3 镁合金摩擦磨损性能51.4本文选题的研究内容72 实验方法82.1 实验材料82.2 实验用仪器设备82.3 试样制备102.4 热处理工艺制定112.4.1 固溶处理112.4.2 时效处理122.5 组织观察122.6 显微硬度测试122.7 摩擦磨损性能测试123 实验结果及讨论133.1 固溶处理对合金显微硬度的影响133.1.1 380固溶处理的显微硬度133.1.2 410固溶处理的显微硬度143.1.3 440固溶处理的显微硬度143.1.4 不同温度固溶处理后显微硬度对比分析153.2 固溶+时效处理对合金显微硬度的影响153.2.1 380 12h固溶+时效处理的显微硬度163.2.2 410 4h固溶+时效处理的显微硬度163.3 固溶处理对合金摩擦磨损性能的影响173.3.1 380 12h固溶处理的摩擦磨损性能173.3.2 410 4h固溶处理的摩擦磨损性能193.3.3 不同温度固溶处理后摩擦磨损性能对比分析213.4 固溶+时效处理对合金摩擦磨损性能的影响223.4.1 380 12h固溶+时效处理的摩擦磨损性能233.4.2 410 4h固溶+时效处理的摩擦磨损性能243.5 AZ91D镁合金显微组织253.5.1 热处理前显微组织253.5.2 固溶处理后AZ91D镁合金显微组织253.5.3