(1. 中国科学院金属研究所 快速凝固非平衡合金国家重点实验室, 沈阳 110015;
2. 沈阳工业学院 材料科学与工程系, 沈阳 110015)
摘 要: 针对QAl9-2合金在海洋环境中亚稳 β1相优先脱铝腐蚀的问题,利用TEM,EDX以及XRD分析,对其发生脱铝和未发生脱铝的区域进行了细致的研究。结果表明,QAl9-2合金的脱铝腐蚀与亚稳β1相的马氏体相变有关,腐蚀优先发生在相变产物片状β1′ 相区,β1′ 马氏体相的优先腐蚀是由有序的DO3结构及其内部存在的大量层错造成的。同时在TEM下观察到脱铝腐蚀形成的小孔及高含铝量的细小腐蚀产物。
关键字: 铜合金; 脱铝腐蚀; TEM
QAl9-2 alloy in marine environment
(1. State Key Lab. of Rapidly Solidified Nonequilibrium Alloys,
Institute of Metal Research, The Chinese Academy of Sciences,
Shenyang 110015, P.R.China;
2. Department of Materials Science and Engineering,
Shenyang Institute of Technology, Shenyang 110015, P.R.China)
Abstract:In view of preferential dealuminification corrosion of metastable β1 phase, QAl9-2 alloy before and after dealuminification in marine environment was studied by TEM, EDX and XRD analysis. It was indicated that the dealuminification corrosion of QAl9-2 alloy is associated with martensite transformation of metastable β1 phase, and occurs within the transformation products, β1′ martensite plates. The reason is that there are DO3 structure and a large amount of stacking faults in the β1′ martensite plates. Micro-pits and aluminum-rich fine corrosion products were also observed by TEM.
Key words: copper alloy; dealuminification corrosion; TEM