日本金属学会誌

J. Japan Inst. Metals, Vol. 19, No. 10 (1955),
pp. 600-604

On the Internal Friction of Cu-Al Alloys

Shuichiro Takahashi and Hiroshi Konno


Abstract:

The internal friction and the Young's modulus of Cu-Al alloys with 0 to 16 weight par cent of aluminium were measured at room temperature using free transversal vibration of about 1000 cycles/sec.An alloy of martensitic structure has an extremely high internal friction(1-2 × 10-3), which is independent of various pretreatments of specimens, such as casting, forging, annealing at 620°, and quenching from 800°, seemingly remaining constant over the frequency range 300 to 7000 cycles/sec and showing a very low Young's modulus (7.5-8.8 × 103 kg/mm2).The internal friction of the alloy consisting of α and β'phases is governed by the quantity of the martensitic structure. The internal friction of α-phase depends largely on the pretreatment of the specimen;its value increases with an elevation of the quenching temperature,and decreases with increasing concentration of aluminium according to a power fuction. The γ-phase has a very low internal friction,and a high Young's modulus.


(Received 1955/4/18)

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