摘要
为探讨显微组织变化对三元复相合金氧化行为的影响 ,采用机械合金化制备了纳米晶三元Cu 40Ni 2 0Cr合金 ,并对比研究了该合金与同成分铸态合金在 70 0～ 80 0℃ ,0 .1MPa纯氧气中的氧化行为 .结果表明 ,铸态合金表面没有形成连续的Cr2 O3外氧化膜 ,但在混合内氧化区则形成了一薄连续网状的Cr2 O3层 .而纳米晶Cu 40Ni 2 0Cr合金表面形成了连续的Cr2 O3外氧化膜 ,晶粒细化降低了合金表面形成Cr2
The thermogravimetric analysis of ternary Cu-40Ni-20Cr alloys with different microstructures was performed in order to study the effect of microstructure change on oxidation behavior of ternary multi-phase alloys. The results show that the casting Cu-40Ni-20Cr alloy is unable to form protective external scale of chromia, but a very irregular and thin continuous layer of chromia formed at the base of the mixed internal region, while mechanical alloying Cu40Ni-20Cr alloy is able to form an external Cr2O3 layer associated with a wide light zone depleted of chromium. The reduction in the alloy grain size obviously favors the formation of Cr2O3 layer on the ternary multi-phase alloy surface.
出处
《化学学报》
SCIE
CAS
CSCD
北大核心
2003年第2期166-170,共5页
Acta Chimica Sinica
基金
国家自然科学基金 (Nos.59871 0 50
50 0 71 0 82 )资助项目
