论文总字数：20113字

摘 要

本论文研究不同成分下Mg-3Zn-xZr阻尼合金的力学性能和阻尼性能。在SF₆气氛的保护条件下熔炼制备试样，然后用金相显微镜观察并获取不同成分的Mg-3Zn-xZr合金的微观组织。随后对Mg-3Zn-xZr合金进行力学性能分析，用型号为HV-1000的显微硬度仪测试Mg-3Zn-xZr合金的硬度，然后利用CSS-44100型电子万能试验机去测试Mg-3Zn-xZr合金的抗拉强度，接着通过型号为JSM-5900的扫描电子显微镜观察并分析合金的断口形貌组织，最后采用低频力学弛豫谱测试仪去测试研究合金的阻尼性能。

实验结果表明：晶粒细化的效果会随着Zr含量的增加而增加，抗拉强度和塑性也会显著增大，显微硬度也会有小幅度增长。阻尼性能方面，随着应变振幅的增大，不同成分合金的阻尼性能都表现出了先呈下降趋势，随后在应变振幅增大的一小段过程中，阻尼值基本保持不变或增长平缓，进一步增大应变振幅，会出现阻尼性能持续上升的现象。在四种成分中，Mg-3Zn-0.7Zr合金在阻尼性能方面最优，抗拉强度和塑性能力也为最优，同时也具有良好的显微硬度，其力学性能和阻尼性能达到了较好的匹配。

关键词：Mg-3Zn-xZr阻尼合金 Zr含量 阻尼性能 力学性能

Study on damping properties of Mg-Zn system alloys

Abstract

The mechanical properties and damping properties of Mg-3Zn-xZr damping alloys with different compositions were studied in this paper. Under the protection of SF₆ atmosphere, the samples were prepared and the microstructure of Mg-3Zn-xZr alloy with different composition was observed by metallographic microscope. Then the mechanical properties of Mg-3Zn-xZr alloy were analyzed, testing the hardness of Mg-3Zn-xZr alloy by micro hardness tester with type HV-1000, then use the CSS-44100 electronic universal testing machine to test the tensile strength of Mg-3Zn-xZr alloy. Then the fracture morphology of the alloy was observed and analyzed by scanning electron microscope of type JSM-5900,Finally, the damping capacity of the alloy was tested by the low frequency mechanical relaxation spectrum tester.

The experimental result shows that: The effect of grain refinement will increase with the increase of Zr content, the tensile strength and ductility will increase significantly, and the micro hardness will be slightly increased. Damping capacity, with the increase of the strain amplitude, the damping performance of the different components of the alloy showed a downward trend. Then, in a short period of strain amplitude, the damping value remains unchanged or increases slowly, and then increases the strain amplitude. In the four ingredients, Mg-3Zn-0.7Zr alloy has the best damping performance, the tensile strength and plastic capacity are also the best, and also has good micro hardness, and its mechanical properties and damping performance achieved a good match.

Key words: Mg-3Zn-xZr damping alloy; Zr content; damping property; mechanical property

目录

摘要 I

Abstract II

目录 III

第一章 绪论 1

1.1阻尼材料研究背景 1

1.1.1噪音和振动的危害 1

1.1.2阻尼的定义 1

1.1.3高阻尼合金概况 1

1.2阻尼机制 2

1.3镁基合金 2

1.3.1研究阻尼镁合金的原因 2

1.3.2镁合金阻尼机理 3

1.3.3阻尼镁合金的强化机制 4

1.3.4改善镁合金阻尼性能的主要方法 4

1.3.5镁基阻尼合金分类 6

1.3.6阻尼镁合金的展望 6

第二章 实验材料及方法 7

2.1实验材料及设备 7

2.1.1实验材料 7

2.1.2实验仪器及规格 7

2.2实验内容及方法 7

2.2.1MgZnZr合金成分的确定 8

2.2.2Mg-3Zn-xZr合金的制备 8

2.3镁合金的测试及表征方法 9

2.3.1金相组织观察 9

2.3.2力学性能测试 9

2.3.3断口形貌分析 10

2.3.4阻尼性能测试 10

第三章 实验结果讨论与分析 11

3.1不同成分的MgZnZr合金的金相组织 11

3.2MgZnZr合金的力学性能 13

3.3MgZnZr合金的断口形貌分析 15

3.4不同成分的MgZnZr合金的阻尼性能 16

第四章 结论 20

参考文献 21

致谢 23

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