A Comparison of Microstructure and Properties of Equivalent Strength Ingot Metallurgy and Powder Metallurgy 7XXX Aluminum Alloys.

摘要

Microstructure and property relationships of equivalent strength ingot and powder metallurgy (I/M and P/M) 7XXX aluminum alloy die forgings were examined. Fatigue, toughness and corrosion behavior are discussed. Unlike the I/M product, the P/M material did not exhibit a reduction in S-N fatigue behavior in the transverse orientation. Since toughness anisotropy is not similarly dependent upon check initiation variables, no such anomaly occurred in this property. P/M material was more resistant to exfoliation corrosion in any condition of heat treatment than the most resistant heat treatment condition of the I/M material.