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- W2014069791 abstract "The effect of porosity on ductility — especially under impact — renders full densification of utmost importance in applications in which material produced from powder is to compete with forgings. The importance of upset flow in achieving densification and strength by hot deformation is recognized. Although shear is widely considered to have a similar desirable effect this is not universally so, and some authors have noted a loss of density associated with shear deformation. In fact, a systematic distinction between upset and shear deformation is not made in the literature. In the present work, copper compacts sintered to 93% of theoretical density were deformed cold in different modes to give controlled amounts of upset and shear. The importance of hydrostatic stress in mechanical densification of sintered metal compacts has been confirmed, although hydrostatic stress was found to be ineffective as density approached the theoretical value. Provided there is a small compressive hydrostatic component of stress, shear is effective in achieving a density close to the theoretical maximum, but there is an optimum shear strain, the magnitude of which increases with that of the hydrostatic compressive stress. There is a need to distinguish between deformation by shear and by upset, which latter is less effective." @default.
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- W2014069791 date "1986-06-01" @default.
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- W2014069791 title "Densification of sintered metal compacts by cold deformation" @default.
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- W2014069791 doi "https://doi.org/10.1016/0378-3804(86)90067-7" @default.
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