Strengthening effects and thermal stability of the ultrafine grained microstructure of a nickel base superalloy at room and elevated temperatures

doi:10.1016/j.matchar.2018.08.055

CORC > 上海应用物理研究所 > 中国科学院上海应用物理研究所 > 中科院上海应用物理研究所2011-2017年

	Strengthening effects and thermal stability of the ultrafine grained microstructure of a nickel base superalloy at room and elevated temperatures
	Xia, T ; Xie, YH ; Yang, C ; Zeng, W ; Bi, ZN ; Liang, JM ; Zhu, GL ; Wang, J ; Zhang, DL ; Lavernia, EJ
刊名	MATERIALS CHARACTERIZATION
	2018
卷号	145 期号:-页码:362-370
关键词	INCONEL ALLOY MA6000 NI-BASED ALLOY MECHANICAL-PROPERTIES OXIDE DISPERSION DELTA-PHASE PRECIPITATION TENSILE CREEP NANOCRYSTALLINE BEHAVIOR
ISSN号	1044-5803
DOI	10.1016/j.matchar.2018.08.055
文献子类	期刊论文
英文摘要	An 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 degrees 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 degrees C (0.78T(m), where T-m is the solidus temperature of the alloy in K). As a result of the high thermal stability of Y(4)Al(2)O9 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 degrees 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 degrees C, despite the absence of gamma' and gamma" precipitates in the UFG microstructure.
语种	英语
内容类型	期刊论文
源URL	[http://ir.sinap.ac.cn/handle/331007/31118]
专题	上海应用物理研究所_中科院上海应用物理研究所2011-2017年
作者单位	1.Cent Iron & Steel Res Inst, High Temp Mat Res Inst, Beijing 100081, Peoples R China 2.Northeastern Univ, Inst Ceram & Powder Met, Shenyang 110819, Liaoning, Peoples R China 3.Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, Shanghai 200240, Peoples R China 4.Shanghai Jiao Tong Univ, Shanghai Key Lab Adv High Temp Mat & Precis Formi, Shanghai 200240, Peoples R China 5.Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai 201800, Peoples R China 6.Univ Calif Irvine, Dept Chem Engn & Mat Sci, Irvine, CA 92607 USA 7.Northeastern Univ, Key Lab Anisotropy & Texture Mat, Minist Educ, Shenyang 110819, Liaoning, Peoples R China
推荐引用方式 GB/T 7714	Xia, T,Xie, YH,Yang, C,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, T.,Xie, YH.,Yang, C.,Zeng, W.,Bi, ZN.,...&Lavernia, EJ.(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, T,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.