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- W2389408894 abstract "Nb-based ultrahigh temperature alloys can be prepared by powder metallurgy,vacuum arc melting and directionally solidification techniques.Directionally solidification can improve the alloys' mechanical properties evi- dently.Generally speaking,the directionally solidified (DS) microstructure is mainly composed of primary Nbss den- drites,Nb silicide blocks or plates and Nbss+Nb silicide eutectic colonies aligned along the growth direction.The mor- phology and size of the DS microstructure are affected by the withdrawing rate and thermal gradient ahead of the solid/ liquid interface significantly.During the directional growth process,Nbss dendrites,Nb silicide blocks and Nbss+Nb silicide eutectic structures solidify in a competitive growth manner,forming microstructures with different morpholo- gies and sizes.However,they can form colonies in parallelly coupled growth manner with suitable growth parameters." @default.
- W2389408894 created "2016-06-24" @default.
- W2389408894 creator A5019098369 @default.
- W2389408894 date "2007-01-01" @default.
- W2389408894 modified "2023-09-22" @default.
- W2389408894 title "Preparation Techniques and Directionally Solidified Microstructure of Niobium-based Ultrahigh Temperature Alloys" @default.
- W2389408894 hasPublicationYear "2007" @default.
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