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MICROSTRUCTURAL CHARACTERISTICS AND MECHANICAL PROPERTIES OF A Nb/Nb5Si3 BASED COMPOSITE WITH AND WITHOUT DIRECTIONAL SOLIDIFICATION

文献类型：期刊论文

作者Sheng, LY; Tian, YX; Guo, JT
刊名ADVANCED COMPOSITES LETTERS
出版日期2018-07-01
卷号27期号:4页码:168-175
关键词Nb/Nb5Si3 composite Directional solidification Microstructure Mechanical properties
ISSN号0963-6935
英文摘要The Nb/Nb5Si3 based composites were fabricated by conventional casting (CC) and directional solidification (DS) methods. Microstructural characteristics, compressive properties and fracture toughness of the CC and DS composites were investigated by SEM, XRD, TEM, bending and compression tests. The results demonstrate that in the CC Nb/Nb5Si3 based composite, the intergrowth of fine (Nb,Ti)ss and alpha-(Nb,Ti)5Si3 phases leads to the formation of eutectic structure and the coarse alpha-(Nb,Ti)5Si3 dendritic phase prefers to grow along eutectic cell boundary. The (Nb,Ti)3 Si, (Ti,Nb)5Si3 and Dy2O3 phases mainly segregate along the eutectic cell boundary and moreover there is an orientation relationship between the (Nb,Ti)3Si and (Nb,Ti)ss phases: [001] (Nb,Ti)3Si//[112](Nb,Ti)ss and (110)(Nb,Ti)3Si//(110)(Nb,Ti)ss. The DS processing promotes the formation of coarse primary alpha-(Nb,Ti)5Si3 phase, (Ti,Nb)5Si3/(Nb,Ti)ss eutectic and alpha-(Nb,Ti)5Si3 /(Nb, Ti)ss eutectic in the DS Nb/Nb5Si3 based composite. Moreover, the (Nb,Ti)ss and alpha-(Nb,Ti)5Si3 phases are aligned paralleling to the DS direction and exhibits strong crystal orientation preference. In addition, an orientation relationship between the (Nb,Ti)ss and alpha-(Nb,Ti)5Si3 phases is observed: [310]alpha-(Nb,Ti)5Si3//[110](Nb,Ti)ss. Compared with the CC Nb/Nb5Si3 based composite. the DS Nb/Nb5Si3 based composite possesses the higher yield strength and fracture toughness, which should be ascribed to the microstructure optimization.
学科主题Materials Science, Composites
语种英语
WOS记录号WOS:000450067200005
源URL[http://ir.imr.ac.cn/handle/321006/80106]  
专题金属研究所_中国科学院金属研究所
作者单位1.[Sheng, L. Y.] Peking Univ, Shenzhen Inst, Shenzhen 518057, Peoples R China
2.[Tian, Y. X.] Baosteel Grp Co LTD, Cent Inst, Shanghai 200122, Peoples R China
3.[Guo, J. T.] Chinese Acad Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China
推荐引用方式
GB/T 7714		 Sheng, LY,Tian, YX,Guo, JT. MICROSTRUCTURAL CHARACTERISTICS AND MECHANICAL PROPERTIES OF A Nb/Nb5Si3 BASED COMPOSITE WITH AND WITHOUT DIRECTIONAL SOLIDIFICATION[J]. ADVANCED COMPOSITES LETTERS,2018,27(4):168-175.
APA Sheng, LY,Tian, YX,&Guo, JT.(2018).MICROSTRUCTURAL CHARACTERISTICS AND MECHANICAL PROPERTIES OF A Nb/Nb5Si3 BASED COMPOSITE WITH AND WITHOUT DIRECTIONAL SOLIDIFICATION.ADVANCED COMPOSITES LETTERS,27(4),168-175.
MLA Sheng, LY,et al."MICROSTRUCTURAL CHARACTERISTICS AND MECHANICAL PROPERTIES OF A Nb/Nb5Si3 BASED COMPOSITE WITH AND WITHOUT DIRECTIONAL SOLIDIFICATION".ADVANCED COMPOSITES LETTERS 27.4(2018):168-175.

入库方式： OAI收割

来源：金属研究所

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