SYMPOSIA PAPER Published: 01 January 1974
STP33125S

Investigation of the Plastic Fracture of High-Strength Aluminum Alloys

Source

In a study of plastic fracture in five high-strength aluminum alloys (2014, 2024, 2124, 7075, and 7079), it has been shown that fracture toughness is affected primarily by the size and volume fraction of the larger (2 to 10 μm) second-phase particles. Certain of these particles crack at small plastic strains, nucleating voids which, with further plastic strain, coalesce to cause fracture. Not all second-phase particles crack at small plastic strains, and qualitative analysis of those which are primarily responsible for void nucleation shows that they contain iron or silicon or both. This result suggests that a reduction in the iron and silicon impurity content of the alloys should improve fracture toughness without loss of strength.

Author Information

Van Stone, RH
Queens University, Kingston, Ont., Canada
Merchant, RH
Queens University, Kingston, Ont., Canada
Low, JR
Queens University, Kingston, Ont., Canada
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Details
Developed by Committee: E08
Pages: 93–124
DOI: 10.1520/STP33125S
ISBN-EB: 978-0-8031-4642-6
ISBN-13: 978-0-8031-0343-6