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Fracture resistance and fatigue crack growth characteristics of two Al-Cu-Mg-Zr alloysThe dependence of strength, fracture resistance, and fatigue crack growth rate on the aging conditions of two alloy compositions based on Al-3.7Cu-1.85Mg-0.2Mn is investigated. Mechanical properties were evaluated in two heat treatment conditions and in two orientations (longitudinal and transverse). Compact tension specimens were used to determine fatigue crack growth characteristics and fracture resistance. The aging response was monitored on coupons using hardness measurements determined with a standard Rockwell hardness tester. Fracture resistance is found to increase with increasing yield strength during artificial aging of age-hardenable 2124-Zr alloys processed by powder metallurgy techniques. Fatigue crack growth rate increases with increasing strength. It is argued that these changes are related to deformation modes of the alloys; a homogeneous deformation mode tends to increase fracture resistance and to decrease the resistance to the fatigue crack propagation rate.
Document ID
Document Type
Reprint (Version printed in journal)
Sarkar, Bhaskar (Lockheed Engineering and Sciences Co. Hampton, VA, United States)
Lisagor, W. B. (NASA Langley Research Center Hampton, VA, United States)
Date Acquired
August 15, 2013
Publication Date
January 15, 1992
Publication Information
Publication: Scripta Metallurgica et Materialia
Volume: 26
ISSN: 0956-716X
Subject Category
Distribution Limits