摘要管高压剪切方法可用于制备管状细晶材料,本文通过管高压剪切制备了经过不同应变量实验的铝/铝复合管(99。98%和99。999%),通过光学显微镜、扫描电子显微镜、电子背散射技术等观察复合界面及其附近的组织特征,并通过显微维氏硬度表征复合界面的强度,剪切试验检测了复合界面的剪切结合强度。实验得出,经过转动1圈和2圈应变量的铝/铝复合管的晶粒(5N铝部分)得到细化,4圈和8圈的试样晶粒尺寸有所增大;复合界面附近的硬度随应变量的增加有明显提升,径向上的硬度分布更加均匀;在一定的应变量范围内,试样的剪切强度随应变量的增加而增加;在加工过程中,界面发生弯折,增加界面长度,有利于冶金结合发生。87685
毕业论文关键词 纯铝 复合界面 显微组织 力学性能 剪切强度
毕业设计说明书外文摘要
Title Interfacial structure characteristics of aluminum / aluminum composite pipe processed by tube high-pressure shearing
Abstract Tube High-pressure shearing (in abbr。 t-HPS) can be used as a method to fabricate clad metallic tubes with fine grains。 In this paper,aluminum/aluminum composite tube (99。98% and 99。999%) was chosen as our subject, processed by t-HPS at several strain level。 And mechanical properties ,in cluding microhardness and shearing strength , of the clad tube was tested by micro Vickers hardness tester and universial testing machine。 The result shows that the grain of aluminum / aluminum composite pipe (5N aluminum) after one or two turns processing was refined。 The grain size of samples after 4 and 8 turns was increased。 The hardness near the composite interface was significantly improved with strain increasing and the hardness distribution was more uniform。 In a certain range of stress, the shear strength of the sample increases with the strain。 The interface was bent during t-HPS processing, which was beneficial to the metallurgical bonding。
Keywords pure aluminum composite interface microstructure mechanical properties shear strength
目 次
1 绪论 1
1。1 研究背景 1
1。1。1 等径角挤压变形法(Equal Channel Angular Pressing) 2
1。1。2 累积叠轧技术(Accumulative Roll-bonding) 3
1。1。3 高压扭转法(High Pressure Torsion) 3
1。1。4 管高压扭转法(High pressure Tube Twisting) 3
1。1。5 管高压剪切变形(Tube High Pressure Shear) 3
1。2 剧烈塑性变形对材料的显微结构和性能影响 4
1。3 研究内容 5
2 实验条件及方法 6
2。1 实验材料 6源-于,优+尔^论=文.网wwW.yOueRw.com 原文+QQ752.018766
2。2 实验方案 7
2。3 试样制备 7
2。4 显微组织表征 8
2。5 力学性能分析 9
2。5。1 显微硬度测试 9