摘要：本文就不同温度下轧制完成的镁合金板材进行固溶时效处理，随后利用拉伸试验机测定了AZ61镁合金板材的抗拉强度和延伸率，利用光学显微镜、扫描电子显微镜观察金相显微组织和拉伸断口形貌，利用维氏硬度机测定热处理后的硬度，通过X射线衍射仪测试，分析XRD衍射峰线的宽化效应和组织的物相分析，从而研究时效处理对镁合金组织和性能的影响。结果表明，轧制后的AZ61存在着成份偏析，晶粒尺寸不均匀而导致力学性能低下。随着时效时间的增长能显著提高合金的抗拉强度, 同时降低了塑性。随着时效时间的延长，AZ61镁合金的延伸率和抗拉强度同步上升。当时间到达24h时综合机械性能最为优良。62252

毕业论文关键词：AZ61镁合金；时效处理

Effect Of Aging Treatment On Microstructure And Properties Of AZ61 Magnesium Alloy

Abstract:  In this paper, different magnesium alloy sheet rolling temperature of complete solid solution and aging treatment, then the tensile strength of AZ61 magnesium alloy sheet was determined and the elongation by tensile test machine, optical microscope, scanning electron microscope observation of microstructure and tensile fracture shape appearance, determination of hardness after heat treatment by using Vivtorinox hardness machine X ray diffraction, phase analysis and organization analysis of the broadening of the diffraction peaks of XRD line of in order to study the effect of aging treatment on the microstructure and properties of magnesium alloy. The results show that after rolling AZ61 exists a segregation, uneven grain size and low mechanical properties. With the aging time increased to significantly improve the tensile strength of the alloy, while reducing the plasticity. With the increase of aging time, the elongation and tensile strength of AZ61 magnesium alloy increased. At the time when the 24h integrated machine Mechanical properties are the best. 

KeyWorlds: AZ61 magnesium；time heat treatment

目录

1.绪论 5

1.1 镁合金的发展概况 5

1.2 镁合金的塑形变形理论和成型基础 7

1.2.1 镁合金的滑移 7

1.2.2 镁合金的孪生 8

1.2.3 影响镁合金孪生的因素 8

1.3 AZ61镁合金的基本概述 9

1.4 国内外变形镁合金的热处理工艺研究 10

1.4.1 退火 10

1.4.2 固溶+时效 11

1.4.3 表面热处理 13

1.5 AZ61 镁合金的研究现状及存在的问题 13

2.实验材料和试验方法 14

2.1 实验材料 14

2.2 热处理制度 15

2.3拉伸测试 15

2.4金相组织观察 16

2.5 晶粒尺寸的测定 17

2.6 拉伸断口形态观察 18

2.7 XRD测试 18

3.时效处理对AZ61镁合金组织和性能的影响 19

3.1 引言 19

3.2金相组织观察