日本金属学会誌

J. Japan Inst. Metals, Vol. 31, No. 7 (1967),
pp. 860-865

The Yield Stress and G.P.Zones of Al-7.0 at%Zn Alloy

Shozo Yoshioka1, Yutaka Nakayama1 and Norio Hosokawa2

1College of Engineering, University of Osaka Prefecture, Sakai
2Postgraduate Student, Research Division in Engineering, University of Osaka Prefecture, Sakai; and now, College of Engineering, Okayama University, Okayama

Abstract:

The yield stress of Al-7.0 at%Zn single crystals containing G.P.zones were measured at 77°K, 195°K and 293°K as a function of the quenching temperature of quenched specimens aged at room temperature for 20 hr and of the aging time of air-cooled specimens aged at room temperature. At the same time, the size and shape of G.P.zones were investigated by means of the measurment of X-ray small angle scattering and transmission electron microscopy. And then the relation between the yield stress and size of G.P.zones were deduced. The yield stress of quenched specimens varied with quenching temperature, i. e., the yield stress showed a maximum at a definite radius of G.P.zone, amounting to 32 Å. X-ray small angle scattering and transmission electron microscopic invertigations showed a change in the shape of G.P.zones at this size from spheres to ellipsoids. The temperature dependence of yield stress was also the largest for the specimen containing spherical G.P.zones. On the basis of these results, the observed yield stress variation of this alloy has been discussed.


(Received 1967/1/16)

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