Damping Capacity of Cold-Worked Al-Ni Alloys

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  • 冷間加工されたAl-Ni合金の減衰能
  • レイカン カコウサレタ Al Ni ゴウキン ノ ゲンスイノウ

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Abstract

The influence of cold working on the damping capacity and the mechanical properties was investigated for Al-Ni alloys containing 0.2 to 12%Ni. The logarithmic decrement δ and the rigidity modulus G were measured by an inverted torsion pendulum method, and the tensile strength σt by an Instron-typemachine.<BR>In both the furnace-cooled and water-quenched states the δ was increased in some degree by the Ni addition. By cold working after heat treatment, the δ became considerably higher with increasing reduction rate in area. The alloys cold-worked after furnace cooling was higher in δ than those cold-worked after water quenching; the Al-4%Ni alloy showed the highest δ value of 63×10−3 when cold-worked to 95% reduction rate in area. The increment in δ by cold working is considered to be due to a remarkable increase in density of dislocations and an action as pinning of a proper amount of compound Al3Ni (ε phase) on dislocation motion. Cold working after the heat treatment results in a decrease in G and an increase in σt. The G and σt both increased with increasing Ni concentration, irrespective of the heat treatment and the cold working that followed.

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