Metallurgical Analysis of an Aluminum Sabot Fired in the Cannon Caliber Electromagnetic Gun (CCEMG),

Kerwien, Stacey

doi:10.21236/ada311023

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Cracking In Aluminum Alloy Armatures1

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2007

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“…Kerwein [7] proposed that intergranular cracks in recovered Al 7475 armatures resulted from overaging or HTO. Overaging occurs when solutes diffuse into and weaken grain boundaries at elevated temperatures.…”

Section: Cracking In Aluminum Alloy Armaturesmentioning

confidence: 99%

Microstructures in the Throat Region of Recovered Aluminum-Alloy Armatures

Watt

Bryant

2007

IEEE Trans. Magn.

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Previous work investigated macroscopic features of recovered aluminum alloy armatures launched at five different currents. Here, microstructural features of those armatures are explored. Several distinct heat-treatment regimes present near the armature throat surface include grain deformation, melting, and material ejection. Two distinct cracking mechanisms are present. The first-presumably due to liquation cracking-occurs at higher currents, is intergranular, and has cracking directions independent of armature geometry directions. The second-likely due to thermal stresses-is intragranular and has strong dependence on orientation. Detailed photomicrographs of the recovered armatures are presented, along with calculated dimensions of the heat-treatment zones and observed cracks.Index Terms-Aluminum-alloy armature, microstructure.

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Section: Cracking In Aluminum Alloy Armaturesmentioning

confidence: 99%