High temperature oxidation of the three-phase alloys Cu-20Ni-30Cr and Cu-20Ni-40Cr under a low oxygen pressure

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	High temperature oxidation of the three-phase alloys Cu-20Ni-30Cr and Cu-20Ni-40Cr under a low oxygen pressure
	X. J. Zhang; M. Al-Omary; Y. Niu
	2005
发表期刊	High Temperature Materials and Processes
ISSN	0334-6455
卷号	24 期号:3 页码:175-182
摘要	The oxidation of two ternary Cu-Ni-Cr alloys containing approximately 30 and 40 at.% Cr, but with a similar Ni content, Cu-20Ni-30Cr and Cu-20Ni-40Cr, was studied at 973-1073 K in H-2-CO2 mixtures providing an oxygen pressure of 10(-19) atm, below the dissociation pressure of nickel and copper oxides. Both alloys are composed of a mixture of three phases, where the phase with the largest copper and lowest chromium content (alpha) forms the matrix and contains a dispersion of particles of the other two phases, one with an intermediate content of Ni and Cr (beta) and another richest in chromium (gamma). The oxidation kinetics of the two alloys at both temperatures exhibited a transition from a first stage, which was nearly parabolic except for Cu-20Ni-40Cr at 1073 K, to a second parabolic stage with a reduced rate constant. Both alloys formed a continuous external chromia scale after 24h oxidation at the two temperatures. The internal oxidation of chromium was essentially absent from the two alloys. The oxidation mechanism is discussed by taking into account the possible effects of the presence of three phases in the oxidation of ternary alloys.
部门归属	chinese acad sci, inst met res, state key lab corros & protect, shenyang 110016, peoples r china. shenyang inst chem technol, shenyang 110142, peoples r china. univ sharjah, dept basic sci, sharjan, u arab emirates.;zhang, xj (reprint author), chinese acad sci, inst met res, state key lab corros & protect, wencui rd 62, shenyang 110016, peoples r china;yniu@imr.ac.cn
关键词	Cu-ni-cr Three-phase Oxidation Low Oxygen Pressure 2-phase Binary-alloys Low Oxidant Pressures Most-reactive Component Coupled Internal Oxidation Possible Scaling Modes Cu-cr Alloys Ternary Alloys External Oxidation Air Oxidation 1-atm O-2
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WOS记录号	WOS:000231793800005
引用统计	被引频次：2[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/35232
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	X. J. Zhang,M. Al-Omary,Y. Niu. High temperature oxidation of the three-phase alloys Cu-20Ni-30Cr and Cu-20Ni-40Cr under a low oxygen pressure[J]. High Temperature Materials and Processes,2005,24(3):175-182.
APA	X. J. Zhang,M. Al-Omary,&Y. Niu.(2005).High temperature oxidation of the three-phase alloys Cu-20Ni-30Cr and Cu-20Ni-40Cr under a low oxygen pressure.High Temperature Materials and Processes,24(3),175-182.
MLA	X. J. Zhang,et al."High temperature oxidation of the three-phase alloys Cu-20Ni-30Cr and Cu-20Ni-40Cr under a low oxygen pressure".High Temperature Materials and Processes 24.3(2005):175-182.