MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
Mechanical Properties and Dislocation Substructure of 6061-T6 Aluminum Alloy Impacted at Cryogenic Temperatures
Woei-Shyan LeeYu-Chi Huang
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2016 Volume 57 Issue 3 Pages 344-350

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Abstract

The mechanical properties and dislocation substructure of 6061-T6 aluminum alloy deformed at temperatures of 0°C, −100°C and −196°C and strain rates of 1000 s−1, 3000 s−1 and 5000 s−1 are investigated using a compressive split-Hopkinson pressure bar. It is found that the flow stress and strain rate sensitivity increase with increasing strain rate, but decrease with increasing temperature. In addition, the work hardening rate decreases with increasing strain rate and temperature. The flow stress corresponding to a true strain of 0.6 is modelled using a power law expression with an activation energy of 1.7 kJ/mol and an average strain rate sensitivity of 0.154. The dislocation density increases with increasing strain rate and decreasing temperature, and leads to a greater flow stress. A greater multiplication and tangling of the dislocations occurs at higher strain rates and lower temperatures. The flow stress and square root of the dislocation density are linearly related via the Bailey-Hirsch type relation σ = σ0 + α1Gb√ρ , where α1 has a value of 0.46 for the current 6061-T6 aluminum alloy.

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© 2016 The Japan Institute of Metals and Materials
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