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Jonathan L. Brewer D. Allen Dalton Evan D. Jackson Aaron C. Bernstein Will Grigsby Eric M. Taleff Todd Ditmire 《Metallurgical and Materials Transactions A》2007,38(11):2666-2673
Laser-shock-induced spall failure is studied in thin aluminum targets at strain rates from 2 to 5 × 106 s−1. Targets were prepared from high-purity aluminum in the recrystallized condition and a low-impurity aluminum alloy containing
3 wt pct magnesium in both recrystallized and cold-rolled conditions. The effects of material and microstructure on spall
fracture morphology are investigated. Recrystallized pure aluminum produced spall fracture surfaces characterized by transgranular
ductile dimpling. Recrystallized aluminum-magnesium alloy with a 50-μm grain size produced less ductile spall surfaces, which were dominated by transgranular fracture, with some isolated transgranular
ductile dimpling at fast strain rates. Transgranular ductile dimpling regions disappeared in recrystallized alloy specimens
with a 23-μm grain size tested at faster rates. Cold-rolled alloy material produced spall failure surfaces consisting of brittle intergranular
and transgranular fractures. Measured spall strength increases with increasing ductile fracture character. Spall failure preferentially
follows grain boundaries, making grain size an important factor in spall fracture surface character.
This article is based on a presentation made in the symposium entitled “Dynamic Behavior of Materials,” which occurred during
the TMS Annual Meeting and Exhibition, February 25–March 1, 2007 in Orlando, Florida, under the auspices of The Minerals,
Metals and Materials Society, TMS Structural Materials Division, and TMS/ASM Mechanical Behavior of Materials Committee.
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Eric M. Taleff (Associate Professor)Email: |
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