Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7988215 | Intermetallics | 2018 | 10 Pages |
Abstract
In the present work, the role of Zr addition on the microstructure and phase formation of hypoeutectic Nbâ16â¯at. % Si alloy has been investigated. The results showed that both binary and alloy with 2â¯at. % Zr resulted in two phase microstructures composed of Nbss and Nb3Si phases. In contrast, the alloys with 4â¯at. % Zr and 6â¯at. % Zr revealed two phase microstructures composed of Nbss and αâNb5Si3 phases. The orientation relationship (OR) obtained between eutectoid lamellar structure comprising of Nbss and αâNb5Si3 phases is (110) Nb//(110) Nb5Si3. The equilibrium microstructures consisting of Nb and αâNb5Si3 phases were obtained in as cast condition when the Zr concentration is above 2â¯at.%. The addition of Zr accelerated the dissociation kinetics of Nb3Si phase in to Nbss and αâNb5Si3 phases during solidification. The formation of αâNb5Si3 phase in the as cast condition eliminates heat treatment required for decomposition of Nb3Si phase in Nb-Si alloys.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
M. Sankar, G. Phanikumar, Vajinder Singh, V.V. Satya Prasad,