高强度高导电率Al-Er-Cu合金的双级退火工艺研究  

Investigation on Two Step Annealing Process of Al-Er-Cu Alloy for High Strength and High Electrical Conductivity

作　　者：张二庆[1] 文胜平[1] 李健飞[1] 陈子勇[1] 聂祚仁[1] 

机构地区：[1]北京工业大学材料学院,北京100124

出　　处：《热处理技术与装备》2017年第3期12-16,共5页Heat Treatment Technology and Equipment

基　　金：青海省科技基金(2015-GX-C02A)

摘　　要：本文对比研究了冷轧态Al-Er-Cu合金单级和双级退火过程中硬度与电导率变化规律,发现由于Er和Cu的析出温度区间不同,单级退火处理无法在该体系中得到高强度高导电率的导体材料。Al0.04Er0.4Cu合金虽然在150℃和200℃退火后硬度下降不明显,但是其所能达到的最高电导率较低;在300℃长时间退火后,最高的电导率可以达到61%IACS,但是硬度显著下降。300℃/2 h+200℃/20 h双级退火后Al0.04Er0.4Cu合金的电导率为62.3%IACS,高于单级退火所能得到的最高电导率约2%IACS;300℃/2 h+200℃/20 h双级退火后硬度为70.5 HV,与冷轧态硬度相比仅下降1.5 HV。这说明300℃/2 h+200℃/20 h双级退火是合适的工艺,能够获得高强度高导电率的Al-Er-Cu合金导体材料。Change law of hardness and electrical conductivity of cold rolled Al-Er-Cu alloy during single step and two step annealling have been investigated in this paper. The result indicates that high strength and high electrical conductivity can not be reached simultaneously with single step annealling because the precipitation temperatures interval of Er and Cu are different. The hardness of Al0. 04Er0. 4Cu alloy decrease slightly after annealing at 150 ℃ and 200 ℃,but the corresponding highest electrical conductivity is relatively lower. The highest electrical conductivity can reach to 61% IACS after annealing at 300 ℃ for a long time,but at the same time the hardness decreases significantly. After two step annealling at 300℃/2 h ＋ 200 ℃/20 h,the electrical conductivity of of Al0. 04Er0. 4Cu alloy is 62. 3% IACS,which is 2% IACS higher than the highest electrical conductivity obtained after single step annealling. The hardness at 300 ℃/2 h ＋ 200 ℃/20 h is 70. 5 HV after two step annealing at 300 ℃/2 h ＋ 200 ℃/20 h,and is only 1. 5 HV lower than the harness of the as cold-rolled Al0. 04Er0. 4Cu alloy. This indicates that two step annealling with 300 ℃/2 h ＋ 200 ℃/20 h is the appropriate process to be able to obtain Al-Er-Cu alloy conductor with high strength and high electrical conductivity.

关 键 词：铝合金 微合金化 双级退火 电导率 

分 类 号：TG166.3[金属学及工艺—热处理]