铝合金时效处理时相变引起体积变化的测量研究
毕业论文关键词：铝合金；时效处理；二次称重法；热膨胀；
The measurement and research of volume change caused by phase transformation in the aging treatment of aluminum alloy
Abstract:This article studies aluminum alloy volume change under different aging treatment by using secondary weighing,and then it has been proved the feasibility of secondary weighing after comparing the results of the thermal expansion with the results of the secondary weighing .The first step of experimental process is obtaining the volume change data of aluminum alloy in different aging conditions, deducing the change in crystal structure information, so as to analyze the phase change heat treatment.Meanwhile, the hardness test was used for checking and coinciding with the trend of volume change.Then, test out the data changes of the sample in the process of thermal expansion by thermal expansion instrument and data process results in origin software.And,testing the size change trend by hardness.Finally, the secondary weighing data is consistent with the thermal expansion, drawing a conclusion that secondary weighing method can be used to measure changes in the volume of aluminum alloy.
Keywords:aluminum alloy; aging;Second weighing method;Thermal expansion;
目 录
1 绪论 1
1.1铝合金简介 1
1.2铝合金的时效处理 1
1.2.1铝合金时效处理的目的 1
1.2.2铝合金时效处理特点 2
1.2.3铝合金时效强化原理 2
1.2.4影响时效的因素 3
1.3相变过程分析体积变化的方法 5
1.3.1热膨胀分析 5
1.3.2 X射线衍射法 5
1.3.3硬度检测分析 6
1.3.4 金相分析 6
1.4 研究的目的意义与内容 7
1.4.1 研究的目的 7
1.4.2 研究的意义 8
1.4.3 研究内容 8
2 实验内容 10
2.1实验原料和设备 10
2.2不同工艺条件的热处理实验 13
2.2.1铝合金2024的固溶热处理实验 13
2.2.2铝合金2024不同时效温度的热处理实验 13
2.2.3铝合金2024不同时效时长的热处理实验 14
2.2.4铝合金211Z的固溶及时效热处理实验 14
2.3二次称重法实验 15
2.4硬度测试实验 17
2.4.1文氏硬度计工作原理 17
2.4.2试验过程 18
2.5 热膨胀分析相结构与尺寸变化 19
2.5.1试样制备 19
2.5.2试验过程 19
3 实验结果与讨论 20
3.1二次称重法实验数据处理与分析 20