HEAT RESISTANT Al BASE ALLOY EXCELLING IN HIGH-TEMPERATURE FATIGUE PROPERTY, DUMPING PROPERTY, ABRASION RESISTANCE AND WORKABILITY

摘要

A heat resistant Al base alloy that is lightweight and excels in not only high-temperature toughness and abrasion resistance but also high-temperature fatigue property, workability and dumping property. There is provided a heat resistant Al base alloy comprising an Al base alloy structure composed of 50 to 90 vol.% of intermetallic compound phase and the balance of metallic Al matrix, wherein the intermetallic compound constituting the intermetallic compound phase has an average size of = 7 µm, preferably = 5 µm, and wherein = 50% of intermetallic compound of = 0.5 µm particle diameter present in the visual field consists of an intermetallic compound with surface rugged configuration satisfying the relationship L<sup