Cu-Al-Ni三元系焼結合金の減衰能について

概要

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Regardless of Ni contents in slack-quenching Cu-14 wt%Al-Ni sintered specimens, we obtained a maximum value of the internal friction at about 50°C in their heating curves, where Q30°C-1 obtained at 30°C always amounts to about 80% of Q50°C-1 and the concentration dependency of Q30°C-1 coincides with that of Q50°C-1. The results obtained were as follows: (1) The maximum value of Q30°C-1 of Cu-Al-4 wt%Ni and Cu-Al-8 wt%Ni sintered alloys with different Al contents were found around 14 wt%Al in both the cases. (2) Q30°C-1 of Cu-14wt%Al-Ni sintered alloys increased up to 6 wt%Ni, kept the maximum value constantly between 6 and 9 wt%Ni, and decreased over than 9 wt%Ni. (3) Judging from the X-ray diffraction patterns, we confirmed that the height of the above-mentioned convex curve corresponds to the quantity of γ martensite, where the slack-quenching Cu-14 wt%Al-8 wt%Ni sintered alloy composed of only single phase of γ martensite shows the maximum value of Q30°C-1.
社団法人粉体粉末冶金協会の論文