MnCuNiFe制振合金の減衰特性に及ぼす組成と熱処理の影響

概要

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The effects of alloy composition and heat treatment on the damping capacity and strength of MnCuNiFe damping alloys were investigated in this study. It is observed that: When Mn composition is varied from 70.5 to 75.9 mass%, the fcc-fct phase transformation temperature increases with the increase of Mn composition at a rate of 3.2K/mass% Mn. This value is larger than the 1.9K/mass% Mn that is expected from the MnCu phase diagram. It is indicated that Mn enriched regions form in the alloys during the controlled slow-cooling process. Meanwhile, increased Ni content enhances not only the twin-boundary damping peak, but also the damping capacity above the transformation temperature of the alloy. The hardness, the strength and the transformation temperature of the alloy can be related to the degree of uneven distribution of Mn and Cu during the ageing process. The aged Ni added MnCuNiFe alloy is found to show the enhanced damping capacity in the temperature range above the transformation temperature because of the gradually continuous transformation.
電気製鋼研究会の論文