摘要
采用硬度测试、透射电镜(TEM)和差示扫描量热分析(DSC)等方法,研究了多级断续时效对高Cu/Mg比Al-Cu-Mg-Ag-Zr合金组织和性能的影响。结果表明,断续时效第二级低温时效对合金硬度无明显影响,第三级高温时效对硬度影响较大,随着时间的延长,硬度先增大且在160℃时效20 h左右达到最大值后减小。透射电镜和DSC证明在断续时效的不同阶段,合金的沉淀析出特征:在第一阶段高温时效中,Ω相和θ'相同时析出,两种析出相的数量无明显差别;在第二阶段低温时效中,θ'相持续析出,无明显的Ω相析出特征;在第三阶段高温再时效中,Ω相和θ'相同时析出长大,Ω相为主要强化相,θ'相相对较少。
By hardness test,differential scanning calorimetry analysis（DSC） and transmission electron microscopy analysis（TEM）,the effect of interrupted multi-step ageing processes on the microstructure of Al-Cu-Mg-Ag-Zr alloy with high ratio of Cu∶Mg was investigated.The results showed that,in the second step,low temperature ageing had no notable influence on the hardness of the alloy;and in the third step,high temperature ageing had notable effect on the hardness,as time changing,the hardness increased at first and then decreased after reaching a maximum value at 160 ℃ for about 20 h.The results of TEM and DSC showed that the characteristics of precipitation was different at different stages of the interrupted multi-step ageing： during the first high temperature aging,Ω phase and θ′ phase precipitated at the same time,and the amount the two precipitates was small;during the second low temperature aging,the θ′ phase precipitated continuously and there was no notable characteristic of Ω phase precipitation;during the third high temperature aging,the phase of Ω and θ′ phase precipitated and grew together,and the Ω phase was the main precipitate while the amount of θ′ was relatively small.
出处
《稀有金属》
EI
CAS
CSCD
北大核心
2011年第2期170-175,共6页
Chinese Journal of Rare Metals
基金
国家自然科学基金(50904010)资助项目
