剧烈塑性变形工艺对AZ31镁合金力学性能的影响分析[论文类型]
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密 惠 保
目录
摘 要.....................................................................III
翻 译.....................................................................IV
1 前 言....................................................................1
1.1 等径角挤压镁合金的课题背景.............................................1
1.1.1 镁合金简介及应用....................................................1
1.1.2 等径角挤压工艺.......................................................2
1.1.3 等径角挤压的研究现状及水平..........................................3
1.2 等径角挤压的选题意义...................................................3
1.2.1 等径角挤压的选题思路................................................3
1.2.2 等径角挤压的选题意义................................................4
2 课题实现的前提及实验原理..................................................6
2.1课题实验实现的前提......................................................6
2.1.1 课题原理简介........................................................6
2.1.2课题模拟的实现.......................................................7
3 课题模拟与实验过程..........................................................9
3.1 DEFORM软件简介及功能介绍.............................................9
3.2 课题数值模拟的过程.......................................................10
3.2.1 ECAP模拟前处理........................................................10
3.2.2 ECAP模拟运算......................................................12
3.2.3 AZ31镁合金ECAP模拟后处理过程.....................................12
3.3 AZ31镁合金ECAP的实验过程...............................................12
3.3.1 实验材料及设备准备.................................................12
3.3.2 实验的具体方案.....................................................13
4 实验结果及分析..............................................................15
4.1 实验结果与分析........................................................15
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4.1.1 ECAP挤压试样的变形...................................................15
4.1.2 AZ31镁合金等径角挤压应力应变关系...................................15
4.1.3 AZ31镁合金等径角挤压硬度分析.......................................16
4.1.4 等径角挤压AZ31镁合金加载力分析....................................20
4.1.5 AZ31镁合金的拉伸实验...............................................21
5 结论与展望...................................................................26
5.1 课题结论..............................................................26
5.2 课题展望..............................................................26
谢 辞............................................................................28
参考文献.........................................................................29 [资料来源：http://think58.com]
摘要
材料的微观组织对其力学性能具有重要的影响，材料的晶粒度越小，材料往往表现出强度、硬度提高，塑性得到改善等优良的力学特性，细晶粒材料在工业生产中极具应用价值。通常采用剧烈塑性变形细化材料的晶粒，因此实现剧烈塑性变形的工艺方法成为研究热点。
本课题采用目前在材料科学界的研究热点——等径角挤压工艺，来对AZ31镁合金进行剧烈塑性变形，并通过对AZ31镁合金等径角挤压实验进行有限元模拟。对实验和模拟参数进行对比分析，从而得出等径角挤压对AZ31镁合金力学性能的影响结果。
等径角挤压工艺是通过对材料进行纯剪切变形，使材料内部累积大的应变量来细化晶粒。本课题采用DEFORM软件对的变形过程进行有限元模拟得出细化晶粒的演化机理。并分析这种机理对AZ31镁合金力学性能的影响。
关键词：等径角挤压、有限元分析、数值模拟、AZ31镁合金力学性能
The Analysis on the Effect of Severe Plastic Deformation on Mechanical Properties of AZ31 Magnesium Alloy
ABSTRACT
The microstructure of materials has important influence on the mechanical properties of the material, the smaller of the grain size, material often show some good mechanical properties such as strength and hardness, plastic improved and so on. Usually adopts acuteness plastic deformation to refine grains of the materials, therefore realizes the violent plastic deformation process method to be a research hotsplot. [资料来源：http://THINK58.com]
This topic adopt a research hotplot of scientific in materials——Equal Channel Angular Pressing process, to implement severe plastic deformation on AZ31 magnesium alloy, and do some finite element simulation on ecap experiment of AZ31 magnesium alloy. Through analysis of the experiment and simulation parameters,to obtain the effect of ECAP on AZ31 magnesium alloy.
Ecap process is based on pure shear deformation on materials, to accumulation large strain amount in the internal of material to refine grains. This subject adopts DEFORM software on the deformation process of finite element simulation that obtain the evolution of grain refinement mechanisms. And analysis the effect of this mechanism on the mechanical properties of AZ31 magnesium alloy.
Key Words: Equal channel angular pressing、Finite element analysis、Numerical simulation、mechanical properties of AZ31 magnesium alloy [来源：http://think58.com]