Fracture resistance and fatigue crack growth characteristics of two Al-Cu-Mg-Zr alloys

Journal Article · Tue Dec 31 23:00:00 EST 1991 · Scripta Metallurgica et Materialia; (United States)

DOI:https://doi.org/10.1016/0956-716X(92)90167-D· OSTI ID:5576167

Sarkar, B; Lisagor, W B ^[1]

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1. Lockheed Engineering and Sciences Co., Hampton, VA (United States) NASA, Langley Research Center, Hampton, VI (United States)

The 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. 12 refs.

• OSTI ID: 5576167
• Journal Information: Scripta Metallurgica et Materialia; (United States), Journal Name: Scripta Metallurgica et Materialia; (United States) Vol. 26; ISSN SCRME; ISSN 0956-716X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103* -- Metals & Alloys-- Mechanical Properties
ALLOYS
ALUMINIUM ALLOYS
COPPER ALLOYS
CRACK PROPAGATION
FATIGUE
FRACTURE MECHANICS
FRACTURE PROPERTIES
HARDENING
MAGNESIUM ALLOYS
MECHANICAL PROPERTIES
MECHANICS
METALLURGY
PHOTOGRAPHY
PHOTOMICROGRAPHY
POWDER METALLURGY
PRECIPITATION HARDENING
ZIRCONIUM ALLOYS