Accession Number : ADP005929

Title :   Fatigue and Fracture Behavior of a PM Al-Li Alloy,

Corporate Author : INDUSTRIEANLAGEN-BETRIEBSGESELLSCHAFT M B H OTTOBRUNN (GERMANY F R)

Personal Author(s) : Schaefer, Rainer ; Weiss, Brigitte

Report Date : AUG 1989

Pagination or Media Count : 13

Abstract : The fatigue life, fatigue crack, growth behaviour and fracture toughness properties of the experimental mechanically alloyed (Aluminium-Magnesium-Lithium) alloy Al 905 XL were investigated. This material has been developed, above all, for being fabricated into structural components by forging. HCF (High Cycle Fatigue) as well as LCF (Life-Cycle Fatigue) date were determined at room temperature and elevated temperature (180 C). Crack growth rates have been measured including near threshold behaviour. The mean values of fatigue life at room temperature have been found to be slightly better than the values of conventional high strength aluminium alloys. Internal defects, however, like inclusions or pores, may reduce fatigue life considerably. AT 180 C fatigue strength decreased to approximately 60% of room temperature values. Crack propagation was noticeably faster in Al 905 XL than in conventional ingot alloy 7075, for example. Keywords: Alloys, Metallurgy, Fatigue(Mechanics), Fracture(Mechanics), Powder metallurgy, Al 905 XL, West Germany. (JG)

Descriptors :   *ALUMINUM ALLOYS, *CRACKS, *FATIGUE(MECHANICS), *FRACTURE(MECHANICS), *LITHIUM ALLOYS, *POWDER METALLURGY, ALLOYS, BEHAVIOR, CRACK PROPAGATION, CYCLES, DEFECTS(MATERIALS), FATIGUE, FATIGUE LIFE, FORGING, GROWTH(GENERAL), HIGH TEMPERATURE, INTERNAL, LIFE CYCLES, METALLURGY, RATES, ROOM TEMPERATURE, STRUCTURAL COMPONENTS, TEMPERATURE, THRESHOLD EFFECTS, TOUGHNESS, WEST GERMANY.

Subject Categories : Properties of Metals and Alloys

Distribution Statement : APPROVED FOR PUBLIC RELEASE