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MICROSTRUCTURAL CHARACTERISTICS AND MECHANICAL PROPERTIES OF A Nb/Nb5Si3 BASED COMPOSITE WITH AND WITHOUT DIRECTIONAL SOLIDIFICATION
Sheng, L. Y.1; Tian, Y. X.2; Guo, J. T.3
Corresponding AuthorSheng, L. Y.(lysheng@yeah.net)
2018-07-01
Source PublicationADVANCED COMPOSITES LETTERS
ISSN0963-6935
Volume27Issue:4Pages:168-175
AbstractThe 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.
KeywordNb/Nb5Si3 composite Directional solidification Microstructure Mechanical properties
Funding OrganizationStrategic New Industry Development Special Foundation of Shenzhen ; Shenzhen Technology Innovation Plan
Indexed BySCI
Language英语
Funding ProjectStrategic New Industry Development Special Foundation of Shenzhen[JCYJ20150529162228734] ; Strategic New Industry Development Special Foundation of Shenzhen[JCYJ20150625155931806] ; Strategic New Industry Development Special Foundation of Shenzhen[JCYJ20160427100211076] ; Strategic New Industry Development Special Foundation of Shenzhen[JCYJ20160427170611414] ; Shenzhen Technology Innovation Plan[CXZZ20140731091722497] ; Shenzhen Technology Innovation Plan[CXZZ20140419114548507]
WOS Research AreaMaterials Science
WOS SubjectMaterials Science, Composites
WOS IDWOS:000450067200005
PublisherADCOTEC LTD
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/130350
Collection中国科学院金属研究所
Corresponding AuthorSheng, L. Y.
Affiliation1.Peking Univ, Shenzhen Inst, Shenzhen 518057, Peoples R China
2.Baosteel Grp Co LTD, Cent Inst, Shanghai 200122, Peoples R China
3.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China
Recommended Citation
GB/T 7714
Sheng, L. Y.,Tian, Y. X.,Guo, J. T.. 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, L. Y.,Tian, Y. X.,&Guo, J. T..(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, L. Y.,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.
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