microstructure and room temperature fracture toughness of nb-si materials alloyed by rare earth elements (la,sm,tb)
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ID: 192896
2016
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Abstract
Nb-20Ti-16Si-3Al-3Cr-2Hf alloy was prepared by non-consumable electrode arc-melting, alloyed with different content of rare earth elements La, Sm and Tb. Microstructures and phase composition were analyzed. The results show that (Nb,Ti) and Nb5Si3 are the main phases. Diverse microstructures in different position of the ingots and coarse phase concentration are observed; eutectic grains and lath-like grains with large Nb5Si3 phase as the core widely exist in these ingots; the eutectic grain contains lamellar structure internal and coarse "teeth like" structure external; the Nb5Si3 phase in the center of lath-like grains persists straight interfaces and regular edges, which is surrounded by fine niobium silicide network and coarse dendritic niobium solid solution (Nbss) phase. Multiple linear regression is used to analyze the relationship of REEs' content and room temperature fracture toughness of the alloy,result indicates that room temperature fracture toughness of these ingots is 11-15 MPa·m1/2. The regression equation of REEs' content (Sm, La, Tb) to room temperature fracture toughness Kq is Kq=10.344+6.896La+2.993Sm.
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feng-wei2016journalmicrostructure
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| Authors | ;GUO Feng-wei;KANG Yong-wang;XIAO Cheng-bo |
| Journal | adsorption science and technology |
| Year | 2016 |
| DOI |
10.11868/j.issn.1001-4381.2016.10.002
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