(1. 中國科學院金屬研究所 快速凝固非平衡合金國家重點實驗室， 沈陽 110015；
2. 沈陽工業(yè)學院 材料科學與工程系， 沈陽 110015)
摘 要: 針對QAl9-2合金在海洋環(huán)境中亞穩(wěn) β1相優(yōu)先脫鋁腐蝕的問題，利用TEM，EDX以及XRD分析，對其發(fā)生脫鋁和未發(fā)生脫鋁的區(qū)域進行了細致的研究。結(jié)果表明，QAl9-2合金的脫鋁腐蝕與亞穩(wěn)β1相的馬氏體相變有關(guān)，腐蝕優(yōu)先發(fā)生在相變產(chǎn)物片狀β1′ 相區(qū)，β1′ 馬氏體相的優(yōu)先腐蝕是由有序的DO3結(jié)構(gòu)及其內(nèi)部存在的大量層錯造成的。同時在TEM下觀察到脫鋁腐蝕形成的小孔及高含鋁量的細小腐蝕產(chǎn)物。
關(guān)鍵字: 銅合金； 脫鋁腐蝕； 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
