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

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 enhanceme...

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Bibliographic Details
Published in:Journal of materials science 1991-05, Vol.26 (10), p.2637-2644
Main Authors: SAHA, R. L, NANDY, T. K, MISRA, R. D. K, JACOB, K. T
Format: Article
Language:English
Subjects:
Applied sciences
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Materials science
Metals. Metallurgy
Phase diagrams and microstructures developed by solidification and solid-solid phase transformations
Physics
Solidification
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Summary: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 Bi. Bismuth enhanced the ductility of the alloy by a factor of two and elastic--plastic fracture toughness to 9 MPa m exp --1/2 from a value of almost zero. The improved ductility of Bi modified alloy is attributed to the reduced interconnectivity of the eutectic silicide, absence of significant silicide 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. Graphs, Photomicrographs. 9 ref.--AA
ISSN:0022-2461
1573-4803
DOI:10.1007/bf02387731