铜铬锆合金形变性能与组织研究

发布时间：2018-05-15 00:42

  本文选题：Cu-Cr-Zr合金 + 高温变形　； 参考：《天津理工大学》2017年硕士论文

【摘要】：Cu-Cr-Zr合金是析出强化型高强高导铜合金,广泛用于微电子工业中的集成电路引线框架材料、点焊电极、高速电气化列车接触导线等领域。众多研究学者对其固溶时效领域进行研究,高温热变形研究较少。本文采用Gleeble-1500热模拟试验机对冷轧时效态Cu-Cr-Zr合金进行高温压缩形变试验,探究Cu-Cr-Zr合金高温热变形最佳加工参数,讨论不同的变形温度、不同的变形速率与不同的变形量三类因素对其热变形行为的影响,观察总结热压缩实验对合金组织性能的影响,利用Cu-Cr-Zr合金形变参数数据库建立材料模型,探索采用大型有限元软件Deform 3D模拟Cu-Cr-Zr合金热挤压工艺。形变参数如下:变形温度分别为500℃、600℃、700℃、800℃;应变速率依次为0.01 s-1、0.1 s-1、1 s-1;变形量为25%、50%。最后获得Cu-Cr-Zr合金真应力-真应变曲线,计算得到变形热激活能,绘制出热加工图,得到安全加工区域。实验结果表明当变形量一定时,Cu-Cr-Zr合金的流变应力随着变形温度的升高而降低,Cu-Cr-Zr合金高温的热激活能为Q=600.2 kJ/mol,求出流变应力本构方程,安全加工参数:变形温度在700℃-800℃之间,变形速率控制在0.1 s-1左右。Cu-Cr-Zr合金高温形变试样组织分析表明,在变形温度500℃范围内,动态回复机制起主要作用;在变形温度600℃-800℃范围内,动态再结晶占主导作用;Cu-Cr-Zr合金的变形温度的升高,对应铜合金的晶粒度降低;铜合金热变形的应变速率增加,Cu-Cr-Zr合金的晶粒度升高,铜合金的变形量越大,其对应的晶粒度越高;硬度值随变形温度的升高而降低,这是因为由动态回复转变为动态再结晶。经过热变形后,合金析出相为Cr单质,随着变形速率的增加,析出相Cr单质的含量逐渐降低。在动态回复转变为动态再结晶过程中,硬度值随变形温度的升高而降低。在Deform 3D软件的数据库中建立与本实验相关的500℃-800℃Cu-Cr-Zr合金材料数据库,选择合适的Cu-Cr-Zr合金对应的应力、应变函数方程以及Cu-Cr-Zr合金热变形本构方程,将其整理导入到材料数据库中,分析得到Cu-Cr-Zr合金热挤压工艺参数,以便于合理地在实际生产中控制好挤压温度与挤压速度。
[Abstract]:Cu-Cr-Zr alloy is a kind of high strength and high conductivity copper alloy, which is widely used in microelectronics industry, such as integrated circuit lead frame material, spot welding electrode, high speed electrified train contact wire and so on. Many researchers have studied the field of solid solution aging, but the hot deformation at high temperature is less. In this paper, the high temperature compression deformation test of cold rolled aged Cu-Cr-Zr alloy was carried out by using Gleeble-1500 thermal simulation machine, the optimum processing parameters of high temperature thermal deformation of Cu-Cr-Zr alloy were investigated, and different deformation temperatures were discussed. The influence of three kinds of factors, different deformation rate and different deformation quantity, on the thermal deformation behavior of the alloy was studied. The effect of thermal compression test on the microstructure and properties of the alloy was observed and summarized, and the material model was established by using the Cu-Cr-Zr deformation parameter database. A large finite element software Deform 3D was used to simulate the hot extrusion process of Cu-Cr-Zr alloy. The deformation parameters are as follows: the deformation temperature is 500 鈩，

本文编号：1890228