Engineering property comparisons of PM alloy X7091-T7E69 and IM alloy forgings

Report (1982)

Authors

W.G.J. 't Hart

L. Schra

Mechanical properties Powder metallurgy Flight simulation Aluminium alloys Stress corrosion cracking Fracture strength Fatigue tests Corrosion tests High strength alloys Forgings Exfoliation corrosion

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Published Date

30-06-1982

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NLR-TR 82054 U

Abstract

The engineering properties of PM alloy X7091-T7E69 forgings were compared with those of forgings of the IM alloys 7075-T73, 7175-T736, 7050-T736 and 7010-T736. The properties considered were: strength, fracture toughness, fatigue crack propagation under constant amplitude and flight simulation loading, stress corrosion crack initiation and propagation resistance, and exfoliation corrosion. The most important findings were: - A substantially better combination of strength and resistance to stress corrosion and exfoliation corrosion for the PM alloy as compared to the IM alloys. - A fracture toughness of the PM alloy lower than (LT orientation) or similar to (TL orientation) that of the IM alloys. - A dramatically low spectrum fatigue crack propagation life for the PM alloy. - Only minor differences between the IM alloys.

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