镁合金热微挤压工艺研究+文献综述
关键词：AZ31 等径角变形 热微挤压 微观组织 硬度
毕业设计说明书（论文）外文摘要
Title Investigation of Magnesium alloy thermal micro-extrusion process
Abstract
With the rapid development of precision machinery and electronics industries, the trend of products miniaturization increasing, and both domestic and foreign experts and scholars launched a wide-ranging and in-depth study on the micro forming, which promotes the micro-forming theory and technology continuous innovation to improve and mature. The super-light magnesium alloys are considered to be the “New structural materials” for the next generation applications, due to their good ability such as low weight and high specific strength．One of the important methods to improve the mechanical properties of products for metal structure material is plastic deformation．In this paper, equal channel angular pressing (ECAP) and hot-micro-extrusion had been used to alter deformation conditions，and achieved a good micro-formability properties．The relationship between microstructure，mechanical properties and deformation condition was investigated by making use of optical microscopy(OM)，Hardness test ，micro hardness test，and tensile test at temperature．The results indicated that：as-cast AZ31 alloys after ECAP, the ductibility improved along with grains refined；as-ECAPed magnesium alloys with fine grains after hot-micro extrusion, the ultimate tensile strength (UTS) got a higher improvement，and the Microstructure uniformly distributed．The radial distribution of hardness are significantly effected by size effect
Key Words： AZ31 ECAP thermal micro-extrusion Microstructure Hardness
目 次
1 绪论 1
1.1 微成形技术 1
1.1.1 微成形技术的基本概念 1
1.1.2 微成形的理论研究 1
1.1.3 微成形技术种类及工艺 4
1.1.4 微成形技术发展状况 6
1.2 镁及镁合金概述 6
1.2.1 镁及镁合金的主要特点 7
1.2.2 AZ31变形镁合金的研究现状 9
1.2.3 AZ31变形镁合金的微挤压 9
1.2.4 变形镁合金等径角变形研究 11
1.3 论文选题依据、研究内容及试验方法 15
1.3.1 选题依据和意义 15
1.3.2 主要研究内容和试验方法 15
2 材料及实验方法 16
2.1 材料的制备 16
2.2 实验流程 16
2.3 坯料预备 17
2.3.1 均匀化热处理 17
2.3.2 等径角变形 18
2.3.3 线切割制备试样 18