摘要采用微多元合金化法设计 Cu-Co-Si-Zr 合金，经过固溶—拉拔变形—时效工艺处 理使合金具有高强度、高导电性、高硬度等优良性能。试验通过改变固溶温度、拉拔 变形量、时效温度和时效时间等变量，探究最佳的热处理工艺组合，结果表明： Cu-Co-Si-Zr 合金最佳固溶温度为 960℃；其他条件相同情况下，拉拔变形量为 60% 时合金电导率达到峰值，且电导率随时效温度升高和时效时间增长而增大，经 960℃ 固溶+60%拉拔变形+520℃×8h 时效处理后的电导率达到 35。2Ms/m，是 960℃固溶后 合金电导率的 3。5 倍；Cu-Co-Si-Zr 合金时效后的硬度与时效温度、时效时间、拉伸变 形量之间的关系均呈现倒“U”型，拉拔变形量 60-75%是硬度值较高区间，此区间的合 金经过 480℃保温 4h 时效处理后硬度提高较大，在 203-210HBW 之间；屈服强度与 抗拉强度均随变形量增大而增大，随时效温度升高而先增大后减小，时效温度为 480℃时，强度达到最高值；塑性随拉拔变形量的增大而减小；合金断口具有大量密 集等轴韧窝。79147

毕业论文关键字：Cu-Co-Si-Zr 合金；冷变形；时效；硬度；电导率

Abstract The Cu-Co-Si-Zr alloy was designed by micro-alloying method,and the alloy has excellent properties such as high strength, high conductivity and high hardness through the process of solid solution and tension deformation。Experient by changing the solution temperature, tensile deformation, aging temperature and aging time, explore the optimum heat  treatment   process,  the  results  show  that  the  Cu-Co-Si-Zr  alloy   best       solution

temperature is  960℃;  Under the  same  conditions,  the  tensile  deformation of 60% alloy

conductivity up to peak , the conductivity increases with aging temperature and the aging time, the conductivity of 960℃ solid solution and 60% tensile deformation and 520℃×8h aging treatment reached 35。2Ms/m, which is 3。5 times of that of the solid solution at 960℃;The relationship between the hardness of Cu-Co-Si-Zr alloy and aging temperature, aging time and tensile deformation is inverted "U" type。Tensile deformation of 60-75% is a high hardness range,this interval of the alloy heat to 480℃ and preserve 2 hours the hardness increased greatly,between 203-210HBW;The yield strength and tensile strength increase with the increase of deformation， strength increases at first and then decreases with aging temperature raise,which reaches the highest value when the aging temperature was   480℃;The  plasticity   of   the   alloy   decreases   with   the   increase  of   the tensile

deformation;The fracture surface of the alloy has a large number of equal-axis ductile voids。

Keywords:Cu-Co-Si-Zr alloy; cold deformation; aging; hardness; conductivity

第一章 绪论 1

1。1 铜及铜合金介绍 1

1。1。1 铜及铜合金的发展 1

1。1。2 高强高导铜合金的生产 1

1。2 高强高导铜合金强化方式 2

1。2。1 铜合金性能的强化影响 3

1。2。2 细晶强化 3

1。2。3 形变强化 3

1。2。4 固溶强化