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Strengthening effects and thermal stability of the ultrafine grained microstructure of a nickel base superalloy at room and elevated temperatures
Xia, Tian1,2; Xie, Yuehuang1; Yang, Chao3; Zeng, Wei1,4; Bi, Zhongnan5; Liang, Jiamiao1; Zhu, Guoliang1,2; Wang, Jun1,2; Zhang, Deliang1,6,7; Lavernia, Enrique J.4
2018
Source PublicationMaterials Characterization
ISSN10445803
Volume145Pages:362-370
AbstractAn ultrafine grained (UFG) nickel base superalloy doped with 5 vol.%Y2O3 nanoparticles, Alloy 718-5 vol.%Y2O3, was fabricated by a powder metallurgy route which combines high energy mechanical milling of Alloy 718 machining chips, spark plasma sintering, hot extrusion and heat treatment, and its microstructure and mechanical properties at room temperature and 650 °C were studied. The study showed that the Y2O3 nanoparticles reacted with Al from the base alloy and transformed to Y4Al2O9 nanoparticles (average diameter: 12.5 nm) which were stable during heat treatment at 970 °C (0.78Tm, where Tm is the solidus temperature of the alloy in K). As a result of the high thermal stability of Y4Al2O9 nanoparticles and their effective pinning of the grain boundaries, the UFG microstructure (average grain size: 179 nm) of the alloy was stable during heat treatment. Grain boundary and nanoparticle strengthening rendered the heat treated Alloy 718-5 vol.%Y2O3 alloy with a notable room temperature tensile yield strength of 1870 MPa. It was demonstrated that the grain boundary strengthening effect associated with the UFG microstructure was still significant at 650 °C, but clearly decreased from its level at room temperature. The grain boundary strengthening and nanoparticle strengthening effects which are likely to be independent of test temperature sustain a reasonably high tensile yield strength of 800 MPa at 650 °C, despite the absence of γ′ and γ″ precipitates in the UFG microstructure. © 2018 Elsevier Inc.
DOI10.1016/j.matchar.2018.08.055
PublisherElsevier Inc.
EI KeywordsTensile strength
EI Classification Number531 Metallurgy and Metallography - 541.2 Aluminum Alloys - 548.1 Nickel - 548.2 Nickel Alloys - 604.2 Machining Operations - 641.1 Thermodynamics - 761 Nanotechnology - 933 Solid State Physics - 951 Materials Science
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Document Type期刊论文
Identifierhttp://ir.sic.ac.cn/handle/331005/25168
Collection中国科学院上海硅酸盐研究所
Affiliation1.School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai; 200240, China;
2.Shanghai Key Lab of Advanced High-temperature Materials and Precision Forming, Shanghai Jiao Tong University, Shanghai; 200240, China;
3.Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai; 201800, China;
4.Department of Chemical Engineering & Materials Science, University of California, Irvine; CA; 92607, United States;
5.High Temperature Material Research Institute, Central Iron&Steel Research Institute, Beijing; 100081, China;
6.Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), Northeastern University, Shenyang; 110819, China;
7.Institute of Ceramics and Powder Metallurgy, Northeastern University, Shenyang; 110819, China
Recommended Citation
GB/T 7714
Xia, Tian,Xie, Yuehuang,Yang, Chao,et al. Strengthening effects and thermal stability of the ultrafine grained microstructure of a nickel base superalloy at room and elevated temperatures[J]. Materials Characterization,2018,145:362-370.
APA Xia, Tian.,Xie, Yuehuang.,Yang, Chao.,Zeng, Wei.,Bi, Zhongnan.,...&Lavernia, Enrique J..(2018).Strengthening effects and thermal stability of the ultrafine grained microstructure of a nickel base superalloy at room and elevated temperatures.Materials Characterization,145,362-370.
MLA Xia, Tian,et al."Strengthening effects and thermal stability of the ultrafine grained microstructure of a nickel base superalloy at room and elevated temperatures".Materials Characterization 145(2018):362-370.
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