摘要
采用洛氏硬度计(HRB)、电子拉伸试验机、透射电镜(TEM)、俄歇能谱(AES)等手段研究了不同时效状态下7A09合金的硬度、强度、应力腐蚀以及晶界附近的化学成分。结果表明:合金的硬度、强度均具有"双峰"特征;合金的应力腐蚀敏感性随时效时间的延长而降低;在第二时效峰状态时合金具有高强度低应力腐蚀敏感性。提出了"相变-Mg-H"复合理论,并用其解释了7A09合金第二时效峰状态时的高强度低应力腐蚀(SCC)敏感性机理。
The hardness, strength, SCC susceptibility and composition of grain boundary of 7000 series aluminum alloys were investigated by means of Rochwell hardometer, electronic tensile machine, TEM and AES. It was shown that the hardness and strength both had double peaks,the SCC susceptibility declined with increasing aging time, and the alloy at second-peaking during aging had higher strength and lower SCC susceptibility. A＂ phase-changing-Mg-H＂ theory was put forward firstly, and the mechanism of high-strength and low-SCC-susceptibility for Al - Zn - Mg - Cu alloy at second-peaking during aging was explained properly by this theory.
出处
《宇航材料工艺》
CAS
CSCD
北大核心
2009年第4期34-38,共5页
Aerospace Materials & Technology
基金
国家自然科学基金资助项目(50771093)
