Microstructure evolution of adiabatic shear bands in AM60B magnesium alloy under ballistic impact

Microstructure evolution of adiabatic shear bands (ASBs) in AM60B Mg alloy impacted by a GCr15 projectile at a velocity of 500 m s −1 was studied through optical microscope (OM), scanning electron microscope (SEM) and transmission electron microscope (TEM). The results show that the deformed and tra...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2010-08, Vol.527 (21), p.5728-5733
Main Authors: Zhen, L., Zou, D.L., Xu, C.Y., Shao, W.Z.
Format: Article
Language:English
Subjects:
Adiabatic flow
Applied sciences
ASBs
Ballistic impact
Bands
Cross-disciplinary physics: materials science
rheology
Deformation, plasticity, and creep
Dynamic recrystallization
Elasticity. Plasticity
Evolution
Exact sciences and technology
Magnesium base alloys
Materials science
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
Mg alloy
Microhardness
Microstructure
Microstructure evolution
Physics
Scanning electron microscopy
Slip bands
Treatment of materials and its effects on microstructure and properties
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Summary:Microstructure evolution of adiabatic shear bands (ASBs) in AM60B Mg alloy impacted by a GCr15 projectile at a velocity of 500 m s −1 was studied through optical microscope (OM), scanning electron microscope (SEM) and transmission electron microscope (TEM). The results show that the deformed and transformed bands were formed around the crater, and the transformed bands under different etchants presented different responses, which indicated that the etching color to distinguish transformed bands was inaccurate. The ultrafine and equiaxed dynamic recrystallized grains in the transformed bands were confirmed, and twinning-induced rotational dynamic recrystallization mechanism was proposed to be responsible for the formation of the ultrafine grains in the bands. Microhardness measurements show that the microhardness in the bands was two times higher than that of the matrix, which should be attributed to the strain hardening and grain refining.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2010.06.013