Deformation coefficients of metal powders

Conclusions

The total deformation coefficients of metal powders are determined by the ratios of the final dimensions of a porous part being deformed to the corresponding dimensions of a nonporous body of the same mass. Comparable total deformation coefficients of metal powders have been represented as the products of the partial deformation coefficients characterizing the possible deformation of a nonporous body of the same mass upon its transition into the free-flowing state and the deformation taking place during the transition from the free-flowing into the porous state under the action of pressure. The deformation coefficients of metal powders are uniquely determined by the relative densities before and after the application of pressure for all the linear principal strain schemes, for the plane schemes$D_{pl\left( \begin{subarray}{l} - - 0 \\ + + 0 \end{subarray} \right)}$, when ɛ_10p = ɛ ⁻¹_20p ,$D_{pl\left( \begin{subarray}{l} - 0 - \\ + 0 + \end{subarray} \right)}$, when ɛ_10p = ɛ ⁻¹_30p , and$D_{pl\left( \begin{subarray}{l} 0 - - \\ 0 + + \end{subarray} \right)}$, when ɛ_20p= ɛ_30pand the volume schemes of isostatic compression and extension when ɛ ⁻¹_10p = ɛ_30p. In the determination of the deformation coefficients for the remaining principal strain schemes, it is necessary to take into account the final dimensions of the porous part being deformed.