摘要铝合金、镁合金具高有比强度、高比刚度，高导热性、阻尼减震性、高静电屏蔽性等优点，并且具有良好机械加工性，尺寸稳定性高等优越性能，在交通工具、电子和通信产品、化工、机械、航空等领域具有极其重要的应用价值。尤其是在航空领域，采用铝合金、镁合金不但可以大大减小机身的自身质量，还可以降低成本。由于镁合金和铝合金的应用广泛性和交叉性，以及在某些场合对其特殊性能的要求，将镁和铝及其合金连接形成复合结构十分必要，这样既可以降低结构重量又可以节约材料。 87773

本文以镁合金(AZ31)/铝合金(7075)扩散焊为研究对象，根据扩散焊原理即在一定温度和压力下使得母材接触面发生微观塑性流动变化，然后母材原子相互扩散形成结合层。设置温度、压力为变量，对比在不同条件下焊接接头的形貌组织、力学性能等得出最佳的焊接温度和压力。通过对实验结果分析发现在465℃，6MPa条件可以得到性能较好的接头。

毕业论文关键词  镁合金 铝合金 真空扩散焊 

毕业设计说明书外文摘要

Title    Dissimilar metal vacuum diffusion welding technology between Al and Mg alloy 

Abstract Al alloy and Mg alloy has high specific strength, high specific stiffness, high thermal conductivity, high damping vibration, electrostatic shielding, etc, and has good mach inability, dimension stability, high performance, superior in transportation, electronics and communications products, chemical, machinery, aviation and other fields is of great application value。 Especially in the field of aviation, aluminum alloy, magnesium alloy not only can greatly reduce the body's own quality, can also reduce the cost。 As the wide-ranging and crossed the application of magnesium alloy and aluminum alloy, and in some places on the properties of the special requirements, connect the magnesium and Al and its alloys to form composite structure is very necessary, it can reduce the structure weight and can save material。源-于,优Y尔E论W文.网wwW.yOueRw.com 原文+QQ752018`766

Based on Mg alloy (AZ31)/Al alloy (7075)diffusion welding as the research object, according to the principle of diffusion welding is under certain temperature and pressure makes the parent metal surface micro plastic flow changes, and then combine the parent metal atom diffusion layer。 Set temperature and pressure as variables, the morphology of contrast under the condition of different welding joint organization, obtains the best welding mechanical properties such as temperature and pressure。 By analyzing the experimental results found at 480 ℃, 6 Mpa conditions can get good joint performance。

Keywords  Al alloy   Mg alloy  vacuum diffusion welding

目   次

1  引言 1

1。1  研究背景与内容 1

1。2  镁合金与铝合金异种材料焊接研究现状 1

1。3  本文主要研究内容 3

2  实验材料、设备及过程 4

2。1  实验材料 4

2。2  实验设备 5

2。3  试验流程 7

3 7075铝合金/AZ31镁合金扩散连接工艺研究 10

3。1 试验工艺参数设计 10

3。2  工艺参数对接头的影响 11

3。3  接头力学性能分析