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Microstructure of the gravitationally settled region in a liquid-phase sintered dilute tungsten heavy alloy

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Abstract

A dilute tungsten heavy alloy consisting of 50W-35Ni-15Fe (wt pct) was liquid phase sintered at 1500 ° for times ranging from 30 to 960 minutes. This alloy corresponds to a nominal solid content of 20 vol pct at the sintering temperature. Because of the excess liquid, the alloy den-sified easily and exhibited extensive liquid-solid separation due to the density difference between the phases. The solid content at the compact bottom ranged from 45 to 70 vol pct over position and time. The microstructure of the settled region was quantified for volume fraction of tung-sten, grain size, connectivity, and settled solid angle of repose. These results provide a basis for extending the microstructural parameters to possible microgravity conditions. The grain growth rate constant varies with the inverse 2/3 power of the volume fraction of liquid, possibly re-flecting combined coalescence and solution-reprecipitation processes. This volume-fraction ef-fect on the grain-growth-rate constant applies to several systems.

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  1. Department of Engineering Science and Mechanics, The Pennsylvania State University, 16802-6809, University Park, PA

    Randall M. German (Brush Chair Professor in Materials)

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German, R.M. Microstructure of the gravitationally settled region in a liquid-phase sintered dilute tungsten heavy alloy. Metall Mater Trans A 26, 279–288 (1995). https://doi.org/10.1007/BF02664666

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