混合粉およびメカニカルアロイング粉を用いた銅-ニッケル焼結合金の弾性率と気孔率との関係

概要

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In this study, the relationships between porosity (P) and elastic modulus of sintered copper-nickel alloys made from mixed powder and mechanically alloyed powders were investigated by an acoustic pulse method. The elastic modulus of sintered alloy made from mixed powder differed from that made from mechanically alloyed powder below 50 mass% copper content. Especially, the difference of Poisson's ratio was clearly observed in the range above 0.05 of porosity. Irrespective of the copper contents or the powders mixed or mechanically alloyed, Young's modulus (E) and shear modulus (G) were described as E = (E_0-K_E・P)(1-P) and G = (G_0-K_G・P)(1-P), respectively, when E_0 and G_0 are E and G at P = 0, K_E and K_G are experimental constants for E and G, respectively. The E_0, G_0, K_E and K_G were cubic functionally decreased with increasing of the copper content. By using above relation, it was clarified that elastic modulus of the sintered copper-nickel alloy can be calculated from two parameters, copper content and porosity.
2003-06-25