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Microstructural changes induced by ternary additions in a hypo-eutectic titanium-silicon alloy

Saha, RL and Nandy, TK and Misra, RDK and Jacob, KT (1991) Microstructural changes induced by ternary additions in a hypo-eutectic titanium-silicon alloy. In: Journal of Materials Science (full set), 26 (10). pp. 2637-2644.

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Abstract

Hypo-eutectic Ti-6.5 wt % Si alloy modified by separate additions of misch metal and low surface tension elements (Na, Sr, Se and Bi) has been examined by microscopic study and thermal analysis. Addition of third element led to modification of microstructure with apparently no significant enhancement of tensile ductility, with the exception of bismuth. Bismuth enhanced the ductility of the alloy by a factor of two and elastic-plastic fracture toughness to 9 MPa m–1/2 from a value of almost zero. The improved ductility of bismuth modified alloy is attributed to the reduced interconnectivity of the eutectic suicide, absence of significant suicide precipitation in the eutectic region and increase in the volume fraction of uniformly distributed dendrites. These changes are accompanied by a decrease in the temperature of eutectic solidification.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Springer.
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited: 23 Nov 2010 09:43
Last Modified: 23 Nov 2010 09:43
URI: http://eprints.iisc.ernet.in/id/eprint/33986

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