日本金属学会誌

J. Japan Inst. Metals, Vol. 14, No. 6 (1950),
pp. 35-37

Effects of Gases on the Properties of Aluminium and its Alloys (3rd Report)

Harerô Iwamura, Nobuo Shioda and Choei Onozaki


Abstract:

In the proceeding reports we described that the mechanical properties and the corrosiveness of Al and its alloys are influenced by the occluded gases.
In the present report we are able to make it clear that there also is a difference as regards the fluidity between the gas-occluded molten Al and its alloys, and those which are not occluded,by our newly devised apparatus. That is to say, the decrease of fluidity with the increase of absorbed hydrogen is recognised, but the Eötvös'es law is not satisfied.
In this case the fluidity which is adopted in our experiment is indicated by the number of the drops of the molten metal, taking into consideration the following conditions, to which no attention may have been paid in the casting method in a spiral mold, such as(1)the surface tension between the molten metal and the grooves of the mold, (2)the edge effect of the flow, (3) above all, the oxide film of the molten metal.
Besides, the following formula is established

n=Kx m1

Where n: Number of drops ; m: Mean weight of drops ; K : Proportional constant ,


(Received 1949/12/10)

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