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Mechano-synthesis of niobium-aluminum superconductors for high field applications

Conference Paper


Abstract


  • In the present investigations, magneto-mechano synthesis, using a novel milling technique, was applied to mixtures of Al and Nb powders milled in Ar under different milling conditions. Structural development was monitoring using x-ray diffractometry, thermal analysis, and reflected light and electron microscopy. Powders milled using the ball impact method, and under shearing mode with a strong magnetic pulling force on the balls were observed to agglomerate due to cold welding. However, powders milled under shearing, with intermediate pulling force displayed continuous structural evolution, with Nb-Al solid solution occurring within 30 h of milling. With increased milling time there was a rapid decrease in Nb3Al lattice parameter, which reached a limiting value of 0.5185nm at around 250h milling. The DTA traces indicated an activation energy (Ea) of 377kJ/mol) for formation of Nb3Al, much higher than that reported for grain growth only, but close to that for the self-diffusion of pure elements, Al and Nb.

Publication Date


  • 1998

Citation


  • Calka, A., Wexler, D., Zhou, J., Sumption, M. D., & Collings, E. W. (1998). Mechano-synthesis of niobium-aluminum superconductors for high field applications. In Materials Science Forum Vol. 269-272 (pp. 1043-1048). doi:10.4028/www.scientific.net/msf.269-272.1043

Scopus Eid


  • 2-s2.0-0030635513

Start Page


  • 1043

End Page


  • 1048

Volume


  • 269-272

Issue


  • PART 2

Abstract


  • In the present investigations, magneto-mechano synthesis, using a novel milling technique, was applied to mixtures of Al and Nb powders milled in Ar under different milling conditions. Structural development was monitoring using x-ray diffractometry, thermal analysis, and reflected light and electron microscopy. Powders milled using the ball impact method, and under shearing mode with a strong magnetic pulling force on the balls were observed to agglomerate due to cold welding. However, powders milled under shearing, with intermediate pulling force displayed continuous structural evolution, with Nb-Al solid solution occurring within 30 h of milling. With increased milling time there was a rapid decrease in Nb3Al lattice parameter, which reached a limiting value of 0.5185nm at around 250h milling. The DTA traces indicated an activation energy (Ea) of 377kJ/mol) for formation of Nb3Al, much higher than that reported for grain growth only, but close to that for the self-diffusion of pure elements, Al and Nb.

Publication Date


  • 1998

Citation


  • Calka, A., Wexler, D., Zhou, J., Sumption, M. D., & Collings, E. W. (1998). Mechano-synthesis of niobium-aluminum superconductors for high field applications. In Materials Science Forum Vol. 269-272 (pp. 1043-1048). doi:10.4028/www.scientific.net/msf.269-272.1043

Scopus Eid


  • 2-s2.0-0030635513

Start Page


  • 1043

End Page


  • 1048

Volume


  • 269-272

Issue


  • PART 2