日本金属学会誌

J. Japan Inst. Metals, Vol. 48, No. 3 (1984),
pp. 323-326

Damping Capacity of Cold-Worked Al-Fe Allays

Masakatsu Hinai1, Hakaru Masumoto1 and Showhachi Sawaya1

1The Research Institute of Electric and Magnetic Alloys, Yagiyama-Minami 2, Sendai 982

Abstract:

The influence of cold-working on the damping capacity and the mechanical properties was investigated for Al-0.2~6 mass%Fe alloys. The logarithmic decrement δ and the rigidity modulus G were measured by the inverted torsion pendulum method, and the tensile strength σ t by an Instron-type machine.
In the states of furnace-cooling and water-quenching, the δ has a fairly low value, 3--6×10-3, increases gradually with the increase in Fe content up to 2% and then becomes nearly constant.
By cold-working after the heat treatments, the δ becomes considerably higher with increasing reduction rate of area RA, and that of the alloys cold-worked by 95% RA has a large value, about 40×10-3. The δ of the alloys cold-worked after furnace-cooling is higher than that after water-quenching. The increase in δ by cold-working should be due to dislocations. It appears that the compound Al3Fe (θ phase) acts on the motion of dislocations.
The G in the heat-treated alloys increases gradually up to 6%Fe, while the σ t increases up to 4%Fe and then decreases gradually. By cold-working, the G decreases and σ t increases.


(Received 1983/09/30)

Keywords:

damping capacity, logarithmic decrement, aluminium-iron alloy, high damping material, tensile strength, rigidity modulus, dislocation, compound Al3Fe


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