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Bullet Construction vs Lethality
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<blockquote data-quote="Noobie" data-source="post: 2919439" data-attributes="member: 127485"><p>Commercially available aluminum is a polycrystalline material consisting of many fine 'grains' (crystals) randomly oriented. The crystal structure is face centered cubic (FCC), and the slip planes coincide with the crystal structure and are thus randomly distributed. There are various commercially available alloys, the most common being 3003 with just a bit of manganese used in such things as cooking pans. This can only be strenghened by cold working. Alloys such as 2024 (with Cu), 6061 (with Mg and Si), and 7075 (Zn, Mg, Cr and Cu) can be strengthened by solution treating then precipitation hardening. The tiny precipitates jam the slip planes in the crystals. This is vastly different than quenching and tempering as used for steel alloys. Rolled bar (as opposed to extruded bar) has elongated grains in the direction of rolling, yet the crystals are still randomly oriented. It does, however, work harden the material and produce different properties in the direction of rolling.</p></blockquote><p></p>
[QUOTE="Noobie, post: 2919439, member: 127485"] Commercially available aluminum is a polycrystalline material consisting of many fine 'grains' (crystals) randomly oriented. The crystal structure is face centered cubic (FCC), and the slip planes coincide with the crystal structure and are thus randomly distributed. There are various commercially available alloys, the most common being 3003 with just a bit of manganese used in such things as cooking pans. This can only be strenghened by cold working. Alloys such as 2024 (with Cu), 6061 (with Mg and Si), and 7075 (Zn, Mg, Cr and Cu) can be strengthened by solution treating then precipitation hardening. The tiny precipitates jam the slip planes in the crystals. This is vastly different than quenching and tempering as used for steel alloys. Rolled bar (as opposed to extruded bar) has elongated grains in the direction of rolling, yet the crystals are still randomly oriented. It does, however, work harden the material and produce different properties in the direction of rolling. [/QUOTE]
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