日本金属学会誌

J. Japan Inst. Metals, Vol. 40, No. 6 (1976),
pp. 564-571

Hot Workability of Aluminum and Aluminum Alloy Ingots with Feather Crystallite Structure

Mitsugu Tokizawa1, Kuniaki Dohda1 and Kazuo Murotani1

1Faculty of Engineering, Toyama University, Takaoka

Abstract:

The hot workability of feather crystallite (F.C.) ingots and granular crystallite (G.C.) ingots was examined by dynamic and static tests to clarify the relation between the cast structure and the workability. The results obtained are as follows:
(1) Load-elongation curves obtained by the tension test showed a maximum at about 0.3% of elongation. When the working temperature was about 500°C, the flow stress σ0.3% was not so different from each other, but elongation was extremely different.
(2) The resistance to compressive deformation in the heat flow direction of F.C. ingot was the lowest of all directions, and that of G.C. ingot was higher than F.C. ingot.
(3) The speed of extrusion products through die bearing at a constant pressure in the heat flow direction of F.C. was the fastest and that of G.C. ingot was the slowest.
(4) When the F.C. ingot was extruded in high-pressure, the feather crystallite structure changed into granular grain structure, and the mechanical properties of extrusion products were the same as those of G.C. ingot.


(Received 1975/09/17)

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