Activation of B as a sintering aid and its improved microstructure modification by using Ni-B coated Ti core-shell powder

doi:10.1016/j.mtla.2018.100182

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	Activation of B as a sintering aid and its improved microstructure modification by using Ni-B coated Ti core-shell powder
	Li, S.F.2; Yang, Y.F.1,2; Kondoh, K.3; Kariya, S.3; Zhu, Q.S.1,2; Shi, Y.4
刊名	Materialia
	2019-03-01
卷号	5
关键词	Binary alloys Chemical activation Coatings Densification Electroless plating Liquids Nickel alloys Nucleation Powders Shells (structures) Tensile strength Textures Titanium alloys Enhanced sintering Heterogeneous nucleation In-situ formations Micro-structure evolutions Microstructure modifications Powder processing Sintering densification Tensile ductility
ISSN号	2589-1529
DOI	10.1016/j.mtla.2018.100182
英文摘要	Ni and B in the Ni-B coated Ti (Ti@Ni-B) core-shell powders fabricated by electroless plating are present in the form of intergrowth of crystals consisting of amorphous Ni-B alloy and Ni3B compounds, which therefore modified the reaction path and liquid formation process. In-situ sintering microstructure evolution indicated that the activation of B as a sintering aid started with the way that Ni and B from coated amorphous Ni-B reacted to form low-melting Ni3B compounds prior to the formation of Ti2Ni between Ni and Ti. Both low-melting-point compounds were melted to form liquid and significantly increased the amount of liquid by which the sintering densification was enhanced. Another positive role of using Ti@Ni-B powders was the in-situ formation of TiB on each Ti particle by which a high number density of low-energy-barrier heterogeneous nucleation sites and pinning points were produced. This resulted in finer grain and better equiaxed crystallization. The enhanced sintering densification contributed to the improved tensile strength while a combination of the equiaxed α-Ti grains, low oxygen increment and reduced porosity were responsible for the increased tensile ductility by 60%. © 2018 Acta Materialia Inc.
WOS研究方向	Materials Science
语种	英语
出版者	Elsevier B.V., Netherlands
WOS记录号	WOS:000536259200001
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/114805]
专题	兰州理工大学
作者单位	1.University of Chinese Academy of Sciences, Beijing; 100049, China; 2.State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, P.O. Box 353, Beijing; 100190, China; 3.Joining and Welding Research Institute, Osaka University, Osaka, Japan; 4.State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou; 730050, China
推荐引用方式 GB/T 7714	Li, S.F.,Yang, Y.F.,Kondoh, K.,et al. Activation of B as a sintering aid and its improved microstructure modification by using Ni-B coated Ti core-shell powder[J]. Materialia,2019,5.
APA	Li, S.F.,Yang, Y.F.,Kondoh, K.,Kariya, S.,Zhu, Q.S.,&Shi, Y..(2019).Activation of B as a sintering aid and its improved microstructure modification by using Ni-B coated Ti core-shell powder.Materialia,5.
MLA	Li, S.F.,et al."Activation of B as a sintering aid and its improved microstructure modification by using Ni-B coated Ti core-shell powder".Materialia 5(2019).