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Microstructure and Mechanical Properties of an Advanced Niobium Based Ultrahigh Temperature Alloy
Guo Xiping 1 * #,Gao Limei 1,Guan Ping 2,KUSABIRAKI Kiyoshi 3,Fu Hengzhi 1
1.State Key Laboratory of Solidification Processing, Northwestern Polytechnical University
2.Northwestern Polytechnical University
3.Toyama University
*Correspondence author
#Submitted by
Subject:
Funding: 国家自然科学基金、教育部博士点基金(No.20020699025)
Opened online: 3 March 2006
Accepted by: none
Citation: Guo Xiping,Gao Limei,Guan Ping.Microstructure and Mechanical Properties of an Advanced Niobium Based Ultrahigh Temperature Alloy[OL]. [ 3 March 2006] http://en.paper.edu.cn/en_releasepaper/content/5487
 
 
The microstructure and mechanical properties including room temperature fracture toughness Kq, tensile strength σb and elongation δ at 1250℃ of the Nb based alloy directionally solidified in an electron beam floating zone melting (EBFZM) furnace have been evaluated. The microstructure is primarily composed of Nb solid solution (Nbss), α-(Nb)5Si3 and (Nb)3Si phases. After directional solidification with the moving rate of electron beam gun R being respectively 2.4, 4.8 and 7.2 mm/min, the primary Nbss dendrites, Nbss + (Nb)5Si3/(Nb)3Si eutectic colonies (lamellar or rod-like) and divorced Nb silicide plates align along the longitudinal axes of the specimens. When R = 2.4 mm/min, the best directional microstructure is obtained. Directional solidification has significantly improved both the σb at 1250℃ and Kq. The maximumσb occurs for the specimens with R = 2.4 mm/min and is about 85.0 MPa, meanwhile, the Kq is about 19.4 MPam1/2.
Keywords:niobium based alloy, niobium silicides, ultrahigh temperature alloy, directional solidification, microstructure, mechanical properties
 
 
 

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