期刊
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
卷 516, 期 1-2, 页码 205-216出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2009.03.051
关键词
Ballistic plugging; Adiabatic shear bands; DRX; Microstructure evolution; Optical and electron metallography
类别
资金
- U.S. Army Research Laboratory (ARL) [DATM05-02-C-0046]
The microstructures and microstructure evolution associated with adiabatic shear band (ASB) formation in ballistic plugging in thick (2.5 cm) Ti-6Al-4V targets impacted by cylindrical, 4340 steel projectiles (2.0 cm in height) at impact velocities ranging from 633 m/s to 1027 m/s (just above the ballistic limit) were investigated by optical and transmission electron microscopy. ASB width increased from 10 mu m to 21 mu m as the velocity increased. ASB evolution was accompanied by the evolution of dark deformation bands composed of alpha' martensite platelets which increased in density with increasing impact velocity. The corresponding Vickers microindentation hardness also increased from HV 619 to HV 632 in contrast to the surrounding matrix microindentation hardness of HV 555. These deformation bands were not necessarily precursors to ASB formation. The ASB average Vickers microindentation hardness was essentially constant at HV 645, a 16% increase over the matrix. This constant microindentation hardness was characterized by a consistent DRX grain structure which varied from equiaxed, defect-free grains (similar to 2 mu m diameter) to heavily dislocated, equiaxed grains. Cracks nucleating and propagating within the ABSs were observed to increase from 8% to 87% of the ASB length with increasing impact velocity. (c) 2009 Elsevier B.V. All rights reserved.
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