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The test techniques that have been used to assess the corrosion behavior of aluminum powder metallurgy (PM) alloys are described. Standard ASTM tests have been used to measure general and pitting corrosion, exfoliation corrosion, and stress-corrosion cracking (SCC) susceptibilities of these alloys. However, the drive to measure subtle but important improvements in SCC behavior at higher strength levels and the desire to understand the complex SCC mechanisms in aluminum PM alloys have led to the use of extremely innovative test techniques. These techniques—the slow strain rate, loading mode, breaking load, bolt-loaded double cantilever beam, and shadow-optical-caustic tests—are described. Examples are presented comparing the susceptibilities of PM alloys to the various types of corrosion with the susceptibilities of conventional ingot alloys.
aluminum alloys, metallurgy, powder metallurgy, corrosion, rapid solidification, mechanical alloying, stress-corrosion cracking, hydrogen embrittlement, exfoliation, general corrosion, pitting, slow strain rate test, loading mode test, shadow-optical-caustic technique, breaking load test
Senior scientist and group leader, Advanced Alloys Research, Martin Marietta Laboratories, Baltimore, MD