摘要近二十年以来，因为变形镁合金自身具备密度较小，比强度较高，减重效果较明显，电磁屏蔽性较好等诸多优点，国际社会和世界强国开始重视并加大了对其研究力度。目前变形镁合金这种新崛起的材料已经被广泛使用到飞机汽车、电子产品和武器装备等多个领域。但是镁合金材料自身密排六方的晶体结构使其在室温条件下塑性很差，难以制备成形，所以目前研究重点主要集中在如何提高镁合金的塑性成形能力。87179

本文使用认可度较高的商业化软件DEFORM，依据相关理论成果创建AZ31镁合金异步轧制过程的有限元模拟所需要的模型，并在前处理中对材料、边界条件、接触等相关性能参数进行了更加详细的设置。再对模拟结果进行后处理分析，检验镁合金模拟过程是否符合实际生产过程，试图找到最优化的工艺参数和工艺方法。

文中着重探讨了在不同压下率的条件下，异步轧制过后等效应力场、等效应变场在宽度方向和厚度方向上的变化规律以及镁合金缺损分布的变化情况。最终得出了等效应变随压下率的增加而变大等等一系列结论。就本次模拟而言，镁合金最佳压下率为60%。

毕业论文关键词：AZ31镁合金；异步轧制；DEFORM；应力场；应变场

Abstract In recent years,due to deformation magnesium alloy itself has a lower density high specific strength,the obvious effect of weight loss,the better electromagnetic shielding and so many advantages,the international society and the world powers began to know its importance and strengthen the efforts of their research。At present, the new rising material of wrought magnesium alloy has been widely used in many fields,such as aircraft,electronic products,weaponry and so on。However,the crystal structure of magnesium alloy is very poor at room temperature,and the crystal structure of the magnesium alloy is very poor at room temperature,so the research focuses on how to improve the plastic processing ability of the magnesium alloy。

In this paper,with the commercialization of the high degree of recognition software deform,according to the relevant theoretical results to create the finite element simulation of rolling process of AZ31 magnesium alloy asynchronous need model and in the pretreatment of materials,boundary conditions,contact and other related performance parameters were more detailed settings。Then the simulation results are processed and analyzed to test whether the magnesium alloy simulation process is in line with the actual production process。

In this paper,the variation of equivalent stress field,equivalent stress field,and the change of the distribution of magnesium alloy defects in the different compression conditions are discussed in this paper。A series of conclusions have been obtained, such as the effect of the equivalent strain increases with the increase of the pressure。 For the purposes of this simulation,the optimal reduction of the magnesium alloy is 60%。

Keywords: AZ31 magnesium alloy;asynchronous rolling;DEFORM;stress    field;strain field

目录

第一章  绪论 1

1。1 研究背景 1

1。2 变形镁合金的研究发展与应用现状 2

1。2。1 变形镁合金的研究现状 2

1。2。2 变形镁合金的应用现状 3

1。2。3 对AZ31镁合金的展望 5

1。3 异步轧制技术的研究现状与发展 5

1。4 有限元模拟技术的研究进展 7

1。5 本文的主要研究内容