Cu-Al_2O_3纳米弥散强化铜合金的短流程制备工艺及性能  

A brief manufacturing process and properties of nano -sized A1_2O_3 dispersion strengthened copper alloy

作　　者：程建奕[1] 汪明朴[2] 李周[2] 郭明星[2] 曹先杰[2] 

机构地区：[1]九江学院材料科学与工程学院,江西九江332005 [2]中南大学材料科学与工程学院,湖南长沙410083

出　　处：《材料科学与工艺》2005年第2期127-130,134,共5页Materials Science and Technology

基　　金：国家高新技术研究发展计划资助项目(2002AA392505).

摘　　要：研究了一种简化的短流程工艺,成功地制备出几种不同成分的Cu-Al2O3弥散强化铜合金.对Cu-0.3wt%Al合金粉末内氧化的研究表明,在700℃～900℃内氧化时,早期进行得非常迅速,硬度的提高主要发生在1h以内;不同温度下内氧化达到硬度峰值的时间也各不相同,且900℃内氧化时硬度的峰值为最高(HV=141).随Al2O3体积分数的增加,挤压态合金σb和σ0.2均逐渐升高,但其增速随Al2O3的增加有逐渐减缓之势.经不同变形量的冷拉拔后,σb和σ0.2基本呈相对均匀的速度增加,且随Al2O3含量的增加,加工硬化的速率逐渐变慢,延伸率则相应降低,电导率的下降幅度不大.所有Cu-Al2O3合金在退火后均能保持其大部分强度(≥72%).A brief manufacturing process of Cu-Al2O3 alloy was developed and several alloys with different Al2O3 content were successfully fabricated. For Cu -0. 3wt% Al alloy powders, the rate of internal oxidation was rapid at its initial stage and the increase in hardness of powders took place during 1 hour when internal oxidation temperature is between 700 -900℃; Hardness reached the peak value at the different time as the internal oxidation occurred at different temperatures. σb andσ0.2 of the extruded alloy increased gradually and the rate tended to be slow with the increase in the volume percent of Al2O3. After various amount of cold drawing, σb andσ0.2 increased uniformly and the hardening rate decreased with the increase of volume percent of Al2O3, while the elongation decreased accordingly and the electrical conductivity drop slightly. All of the Cu - Al2O3 alloy retain most part of strength ( ≥72% ) after annealed at high temperature.

关 键 词：Cu—Al2O3 短流程 弥散强化 性能 

分 类 号：TG146.11[一般工业技术—材料科学与工程]