Pore-grain boundary interactions during sintering of pure nickel under variable pressure

Abstract

It has been demonstrated that applied pressure and the resulting entrapped gas can significantly alter the microstructural evolution during the sintering of pure nickel compacts. High internal gas pressure can stabilize pore size, retarding pore coalescence, coarsening, sintering, and grain growth. In contrast, in normally sintered and hot-pressed bodies, small pores may be dragged with the boundaries and coalesce and coarsen to produce large, widely-spaced, and relatively immobile pores which then experience break-away