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• W2012904818 abstract "Abstract Preliminary research on the gravity-induced distortion of WNiFe heavy metal parts (90–97%W) during liquid-phase sintering conditions (1450–1550 °C, less than 25.5% of liquid-phase volume fraction) showed a departure from the linear-viscous creep usually observed in ceramic-glass or other non-metallic systems deforming in the partially molten state. The stress exponent ( n ⋍ 2 ) and the activation energy of the deformation measured in the heavy metal suggested that grain boundary sliding of the solid skeleton of interconnected tungsten particles was the controlling deformation mechanism for its creep in presence of a moderate fraction of liquid phase. This paper presents a new series of tests aimed at obtaining more precise results on the rheology of the same system. The temperature range 1450 ⩽ T ⩽ 1600 °C has been covered with two alloys containing different amounts of liquid phase. Strains (and strain rates) have been estimated from the gravity-induced creep of cylindrical specimens ( δ⩽6 kPa , dot e ≲ 10 −5 s −1 . The results confirm the previous conclusion about the dominance of the grain boundary sliding mechanism. Moreover, the volumetric strain associated with the compressive distortion, only qualitatively assessed in the previous research, has now been quantified. The unconstrained deformation of the two-phase mixture is accompanied by a dilation of the sample regions undergoing the largest strain. As a consequence, there is a redistribution of liquid phase that leads to a contraction of the less deformed regions of the sample." @default.
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• W2012904818 date "1994-02-01" @default.
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• W2012904818 title "Plastic flow of a two-phase solid-liquid metallic system" @default.
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• W2012904818 doi "https://doi.org/10.1016/0921-5093(94)91055-3" @default.
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