摘要
采用透射电子显微镜(TEM)、选区电子衍射(SADP)和硬度测试等手段研究1973高强高韧铝合金在不同温度下的单级时效析出及硬化行为。结果表明:1973铝合金在120和140℃有很强的抗过时效能力,峰时效过后,硬度在长时间内基本保持在195 HV附近。1973铝合金的析出序列为:α过饱和固溶体(SSS)→GPⅠ区/GPⅡ区→η'亚稳相→η平衡相→T相。在140℃单级时效过程中,GPⅡ区和η'相一直都存在于时效合金中,对合金起着最大的强化作用。
The ageing precipitation and hardening behavior of 1973 high strength and high toughness aluminum alloy were studied by means of transmission electron microscopy（TEM）,select area electron diffraction（SAED） and hardness measurements at different ageing temperatures.The results show that this alloy has obvious anti-over-aging capability at 120 and 140 ℃.And this alloy can keep the hardness of 195 HV in a long time after peak-ageing.Furthermore,the precipitation sequence of 1973 aluminum alloy can be described as follows： supersaturated solid solution（α）→ GPⅠ/GPⅡ zone→ metastable η＇→ stable η→T phase.There are GPⅡ zone and η＇ phase with the greatest strengthening effect on the 1973 aluminum alloy during the whole ageing process at 140 ℃.
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2011年第3期522-528,共7页
The Chinese Journal of Nonferrous Metals
基金
国家高技术研究发展计划资助项目(2006AA03Z517)
中南大学优秀博士学位论文扶植基金资助项目(2010ybfz024)
关键词
1973合金
时效硬化
析出相
析出序列
1973 aluminum alloy
ageing hardening
precipitation
precipitation sequence
