| Investigation on Optimal Ta/Cr Ratio of a Single Crystal Ni-Base Superalloy in View of the Isothermal Oxidation Behavior | |
| Chang, Jianxiu1; Feng, Wenhao1; Zhao, Wenwen1; Jia, Hongmin1; Liu, Yanming1; Luo, Sheji1; Wang, Dong2; Dong, Jiasheng2 | |
| Corresponding Author | Chang, Jianxiu() |
| 2021-11-01 | |
| Source Publication | CRYSTALS
 |
| Volume | 11Issue:11Pages:15 |
| Abstract | 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. |
| Keyword | superalloy high-temperature oxidation tantalum oxide |
| Funding Organization | National Natural Science Foundation of China ; National Science and Technology Major Project ; National Science Foundation of Shaanxi Province of China |
| DOI | 10.3390/cryst11111421 |
| Indexed By | SCI |
| Language | 英语 |
| Funding Project | 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 Research Area | Crystallography ; Materials Science |
| WOS Subject | Crystallography ; Materials Science, Multidisciplinary |
| WOS ID | WOS:000723789300001 |
| Publisher | MDPI |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.imr.ac.cn/handle/321006/167494 |
| Collection | 中国科学院金属研究所 |
| Corresponding Author | Chang, Jianxiu |
| Affiliation | 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 |
| Recommended Citation 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. |
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