Aluminium alloy plate and method for its manufacture

Details Aluminium alloy plate and method for its manufacture Aluminium alloy plate and method for its manufacture

1995-06-06

1998-06-30

Wyszomierski, George

Metal treatment

Process of modifying or maintaining internal physical...

Utilizing disclosed mathematical formula or relationship

148552, 148691, 148437, 148439, C22F 104

Patent

active

057728003

ABSTRACT:
An aluminium alloy plate is provided with a thickness of more than 2 inches, e.g. 6, 7 or 8 inches, and having an average logarithmic fatigue life of more than 100,000 cycles determined in accordance with ASTM test method E 466. The density of micropores with a size larger than 80 .mu.m in all locations in the midplane (T/2) midwidth position at head and tail ends of the finished plate as measured by Optical Microscopy of samples in any plane perpendicular to the midplane is less than 0.025 micropores per cm.sup.2. The plate may be formed by degassing of a melt to give a specified porosity of the cast ingot, and by hot rolling with at least one specified high reduction ratio pass.

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"Advances If Fracture Research" Proc 7th Int. Conf. Houston, Texas 20-24, Mar. 1989, Pergamon, Oxford, GB, 1989 vol. 2, pp. 999-1007 P.E. Magnusen, et al The Influence of Material Quality on Airframe Structural Durability Figures 2, 3, Table 1.
Transactions of the American Foundryman's Society, vol. 94, 1986, USA pp. 47-56, M. Abbas, et al "Microporosity of Air Cast & Vacuum . . . ".
Journal of Testing and Evaluation, vol. 18, nr. 1, Jan. 1990, Phil., USA pp. 439-445, Magnusen, et al "Durability Assessment Based On . . . ".
Metallurgical Transactions, vol. 4, Apr. 1973, N.Y., USA, pp. 1069-1076, D-H. Chien, et al "Cast Microstructure and Fatigue Behavior of A High Strength Aluminium Alloy (DO-1)".

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