摘要
通过硬度测试、差示扫描量热法(DSC)分析、拉伸性能测试和透射电镜(TEM)微观组织观察,研究了Al-4Cu-1.3Mg-0.9Si合金的析出强化行为。结果表明:合金具有较强的析出强化能力;合金在160～220℃下时效,随时效温度的升高,合金的时效响应速率加快,时效峰值硬度有所下降;合金在190℃时效态时,其主要析出相为S相,在190℃/24h时效态合金中还发现少量的方块状相;合金经190℃/24h时效后其常温和高温抗拉强度较同等条件下制备、同等热处理状态下的Al-4Cu-1.3Mg合金有明显的提高。
The Precipitation hardening behavior of Al-dCu-1.3Mg-0.9Si during the aging was investigated by hardness measurement, differential scanning calorimetry（DSC） analyses, tensile test and microstructure analyses. The results show that the alloy exhibited a superior precipitation hardening ability. The aging response rate was greatly accelerated with elevating the aging temperature from 160℃ to 220%, and the peak hardness was remarkably decreased. The major strengthening precipitates of the alloy aging at 190 ℃ was the S phase. After ageing at 190℃ for 24h, the precipitates of the alloy were S phase with a small amount of cubic phase. Compa- ring with Al-4Cu-1.3Mg alloy prepared under the same conditions, the Al-4Cu-1.3Mg - 0.9Si alloy exhibited superior tensile strengths at room and elevated temperature.
出处
《航空材料学报》
EI
CAS
CSCD
北大核心
2012年第3期1-4,共4页
Journal of Aeronautical Materials
基金
国家自然科学基金资助项目(51004018)
