摘要
研究不同时效温度对Al-5.06%Cu-0.44%Mg-0.55%Ag-0.30%Mn-0.17%Zr合金室温力学性能和高温持久性能的影响。研究结果表明:合金在250℃时效有很高的时效响应速度,但是,在250℃时效后的峰值强度要明显低于165℃时效的峰值强度;在相同条件下高温时效后的合金在峰值状态的持久寿命最长,并且其持久强度要远远高于低温欠时效态的持久强度;Ω相为合金高温时效后的主要强化相,高温时效抑制了θ′的析出;高温短时间人工时效能够极大地提高合金的高温持久性能。
The mechanical properties of an Al-5.06%Cu-0.44%Mg-0.55%Ag-0.3%Mn-0.17%Zr aluminum alloy were investigated at room temperature and elevated temperature. The results show that the aging response of the experimental alloy is greatly accelerated by high temperature aging, but this treatment decreases the peak aging strength of the alloy. The creep rupture life of high temperature peak aged alloy is longer than those under other aging conditions. Compared with the moderate temperature under aging condition, the high temperature aging treatment greatly increases the creep rupture strength of the alloy test at 200 ℃for 100 h. The high temperature aging treatment has completely suppressed precipitation of θ＇ phase and the alloy is strengthen only by Ω phase. It is indicated that high temperature can greatly increase the high temperature properties of the experimental alloys.
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2008年第3期532-537,共6页
Journal of Central South University:Science and Technology
基金
国家重点基础研究发展计划资助项目(2005CB623705-04)
