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The Role of Second Phase Intermetallic Particles on the Spall Failure of 5083 Aluminum

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Journal Article - Open Access

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Army Research Laboratory Aberdeen Proving Ground, United States

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5083 aluminum alloy is a light-weight and strain-hardened material used in high strain-rate applications such as those experienced under shock loading. Symmetric real-time in situ and end-state ex situ recovery plate impact shock experiments were conducted to study the spall response and the effects of microstructure on the spall properties of both 5083-H321 and 5083-ECAE 30 cold-rolled CR aluminum alloys shock loaded to approximately 1.46 GPa approx0.2 kms and 2.96 GPa approx0.4 kms. The results show that mechanically processing the 5083-H321 aluminum by Equal Channel Angular Extrusion ECAE, followed by subsequent CR significantly increases the Hugoniot Elastic Limit HEL by 78 . However, this significant increase in HEL was at the expense of spall strength. The spall strength of the 5083-ECAE 30 CR aluminum dropped by 37 and 23 when compared to their 5083-H321 aluminum counterpart at shock stresses of approximately 1.46 and 2.96 GPa respectively. This reduction in spall strength is attributed to the cracking and re-alignment of the manganese Mniron Fe rich second phase intermetallic particles during mechanical processing i.e., ECAE and subsequent CR, which are consequently favorable to spallation.

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  • Properties of Metals and Alloys

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