Investigation on Optimal Ta/Cr Ratio of a Single Crystal Ni-Base Superalloy in View of the Isothermal Oxidation Behavior

doi:10.3390/cryst11111421

IMR OpenIR

	Investigation on Optimal Ta/Cr Ratio of a Single Crystal Ni-Base Superalloy in View of the Isothermal Oxidation Behavior
	Chang, Jianxiu 1; Feng, Wenhao 1; Zhao, Wenwen 1; Jia, Hongmin 1; Liu, Yanming 1; Luo, Sheji 1; Wang, Dong 2; Dong, Jiasheng 2
通讯作者	Chang, Jianxiu()
	2021-11-01
发表期刊	CRYSTALS
卷号	11 期号:11 页码:15
摘要	The relative content of strengthening element tantalum (Ta) and oxidation-resistant element chromium (Cr) is an essential value for superalloys to obtain an excellent combination of oxidation resistance and mechanical properties. In the present paper, the isothermal oxidation behavior of several single crystal Ni-base superalloys with different Ta/Cr (wt. %, similarly hereinafter) ratios at 1000 & DEG;C in static air has been systematically investigated to explore the optimal Ta/Cr for excellent oxidation resistance. A detailed microstructure study using X-ray diffraction (XRD), scanning electron microscopy (SEM) with energy dispersive spectroscopy (EDS) and an electro-probe microanalyzer (EPMA) was performed to reveal the oxidation products and mechanisms. For all alloys, a three-layer structured scale consisting of an outer (Cr, Al, Ti, Ni, Ta)-O layer, an inner Al2O3 layer and an inner nitride layer was formed. As Ta/Cr increased, the amounts of Ta-containing products, cracks, holes and inner nitride increased. Meanwhile, the completeness of the Al2O3 layer got worse. It was shown that if Ta/Cr & LE; 0.5, Ta increased the growth rate of Cr2O3 via the doping effect induced by Ta cations. If Ta/Cr > 0.5, Ta reduced the completeness of Cr2O3 through competitive growth of Ta2O5 and Cr2O3. A good oxidation performance can be expected with the value Ta/Cr & LE; 0.5.
关键词	superalloy high-temperature oxidation tantalum oxide
资助者	National Natural Science Foundation of China ; National Science and Technology Major Project ; National Science Foundation of Shaanxi Province of China
DOI	10.3390/cryst11111421
收录类别	SCI
语种	英语
资助项目	National Natural Science Foundation of China[51901179] ; National Science and Technology Major Project[2017-VI-0019-0091] ; National Science Foundation of Shaanxi Province of China[2018JQ5198]
WOS研究方向	Crystallography ; Materials Science
WOS类目	Crystallography ; Materials Science, Multidisciplinary
WOS记录号	WOS:000723789300001
出版者	MDPI
引用统计	被引频次：3[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/321006/167494
专题	中国科学院金属研究所
通讯作者	Chang, Jianxiu
作者单位	1.Xian Shiyou Univ, Coll Mat Sci & Engn, Xian 710065, Peoples R China 2.Chinese Acad Sci, Inst Met Res, Superalloys Div, 72 Wenhua Rd, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Chang, Jianxiu,Feng, Wenhao,Zhao, Wenwen,et al. Investigation on Optimal Ta/Cr Ratio of a Single Crystal Ni-Base Superalloy in View of the Isothermal Oxidation Behavior[J]. CRYSTALS,2021,11(11):15.
APA	Chang, Jianxiu.,Feng, Wenhao.,Zhao, Wenwen.,Jia, Hongmin.,Liu, Yanming.,...&Dong, Jiasheng.(2021).Investigation on Optimal Ta/Cr Ratio of a Single Crystal Ni-Base Superalloy in View of the Isothermal Oxidation Behavior.CRYSTALS,11(11),15.
MLA	Chang, Jianxiu,et al."Investigation on Optimal Ta/Cr Ratio of a Single Crystal Ni-Base Superalloy in View of the Isothermal Oxidation Behavior".CRYSTALS 11.11(2021):15.