摘要铝镁合金是众多金属和合金材料中综合性能最好的材料之一。因此，铝镁合金不仅目前在航空航天、交通运输、以及建筑施工等领域应用广泛，而且在能源开发、生活用品和医疗技术创新等领域也迅速发展，应用前景非常广阔。87112

本文对尺寸为20mm × 20mm × 35mm的铸态铝镁合金试样进行20%、40%和60%三种变形量的纵向压缩变形，然后将厚度为16mm、12mm和8mm的三种试样在250℃下保温1小时进行相同的热处理。并通过蔡司显微镜观察金相组织、万能材料试验机的力学性能测试、显微硬度测试和断口显微形貌扫描等分析测试手段，系统的研究20%、40%和60%变形量铝镁合金未热处理和热处理后的显微硬度、力学性能、显微组织和断口形貌。实验结果表明：（1）压缩变形后，铝镁合金的显微硬度大大提高，不同变形量的铝镁合金显微硬度差距不大。热处理后，压缩变形铝镁合金显微硬度整体降低。（2）压缩变形量20%的铝镁合金热处理后抗拉强度降低，压缩变形量40%和60%的铝镁合金热处理后抗拉强度提高。（3）压缩变形量20%的铝镁合金热处理后组织经过回复，晶粒粗大。压缩变形量40%的铝镁合金热处理后产生大量再结晶核心，压缩变形量60%的铝镁合金热处理后经历完整的再结晶过程，形成完整的新组织。

毕业论文关键词：铝镁合金；压缩变形；再结晶；力学性能；显微组织

Abstarct Al-Mg alloy is one of the best materials in many metals and alloys。 Therefore, aluminum magnesium alloy not only at present has been widely used in aerospace, transportation, construction and other areas of application, but also in the field of energy development, daily necessities and medical technology innovation has also been a rapid development, application prospect is very broad。 

In this paper, the size of 20mm x 20mm x 35mm cast aluminum magnesium alloy specimens were 20%, 40% and 60% three deformation of longitudinal compression deformation, and the three samples that thickness is 16mm, 12mm and 8mm are keep at 250℃ for one hour for the same heat treatment。 Methods of analysis and testing like Zeiss microscope observation of microstructure, universal material testing machine tensile test, micro hardness test and fracture morphology scanning, are used to study the micro hardness, mechanical properties, microstructure and fracture surface morphology, that 20%, 40% and 60% deformation of the amount of heat treatment and heat treatment of aluminum and magnesium alloy。 The experimental results show that: (1) After compressive deformation, the micro hardness of Al-Mg alloy is greatly improved, and the difference of the hardness of Al-Mg alloy with different deformation is not very large。 After heat treatment, the microstructure of the aluminum magnesium alloy is decreased。 (2) Compressive deformation of 20% aluminum magnesium alloy after heat treatment tensile strength reduction, compression deformation of 40% and 60% of the aluminum magnesium alloy after heat treatment tensile strength increased。 (3) The compressive deformation of 20% aluminum magnesium alloy after heat treatment, the microstructure after recovery, coarse grain。 After heat treatment of aluminum magnesium alloy with compression deformation of 40%, a large number of recrystallization cores were produced。 After heat treatment of aluminum magnesium alloy with compression deformation of 60%, the process of heat treatment was completed。

Keywords:Al-Mg alloy, compressive deformation, recrystallization, mechanical property, microstructure

目  录

第一章 绪论 1

  1。1 研究背景 1

  1。2 课题研究的目的和意义