Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第11卷    第3期    总第42期    2001年6月

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文章编号:1004-0609(2001)03-0428-05
QAl9-2合金脱铝腐蚀的TEM研究
韩 忠1, 赵 晖2, 林海潮1

(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

TEM observation on dealuminification corrosion of
QAl9-2 alloy in marine environment
HANG Zhong1, ZHAO Hui2, LIN Hai-chao1

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

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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