Opportunities in Protection Materials Science and Technology for Future Army Applications (2011) / Chapter Skim
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Appendix H: Metals as Lightweight Protection Materials
Appendix H: Metals as Lightweight Protection Materials
Pages 142-147
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From page 142... ...
for protection material applications, given minum is very soft, conventional aluminum alloys can have the density of titanium. However, titanium alloys can have yield strengths that easily compete with the simpler steels.
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From page 143... ...
FIGURE H-1 SpecificFigure versus specific strength of various stiffness H-1.eps Figure H-2 presents stress versus strain curves obtained materials, including metals and ceramics. The position occupied by bitmap on a trimodal aluminum alloy at strain rates of 3,200 s–1 and rolled homogeneous armor is identified, as is the conventional alu 11,000 s–1 using a compression Kolsky bar.
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From page 144... ...
One of the density of magnesium approaches that of polymers. Magne- more promising strengthening approaches appears to be the sium and magnesium alloys, which are among the lightest development of ultra-fine-grained or nanostructured magstructural metals, are becoming increasingly important in nesium alloys through severe plastic deformation.
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From page 145... ...
silicon to form a tough SiC bonding phase that provides su The conventional method for fabrication of MMCs is perior performance as a cermet armor protection material. A to compress a porous compact of ceramic powder to ap lightweight cermet material was also developed at Lawrence proximately 65 percent of its theoretical density, leaving Livermore National Laboratory, using boron carbide for the an open and continuous pore phase, which can be readily ceramic compact, backfilled with aluminum metal, and subinfiltrated with molten metal, usually aluminum.
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From page 146... ...
are integrated through a self-propagating exother mic reaction.22 The development of nanoscale, multilayer, a trimodal Al-B4C cermet was developed, in which coarsegrained aluminum was introduced into the nanocrystalline self-propagating exothermic reaction foils, which can be Al reinforced with B4C particles.19 A trimodal composition ignited by a simple electrical spark, is important for joining with 10 wt percent B4C, 50 wt percent coarse-grained Al FGACs to a wide range of structural surfaces as well as for 5083, and the remainder nanocrystalline Al 5083 exhibited modular armor repair. 1,065 MPa yield strength under compressive loading while In summary, cermet materials exhibit light weight and still showing 0.04 true strain deformation.
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From page 147... ...
ties of each component phase are often not fully realized in Mechanistic research on high-temperature ceramic-metal the composite structure. Cermets can be fabricated in a rela - bonding in cermets, the fabrication of these structures, and tively straightforward manner and in a wide variety of forms, their relationship to projectile defeat and armor performance but most MMCs, like aluminum, have been developed with can productively be researched.
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