Armor--Aircraft. Metallurgical Properties of Several Aluminum and Magnesium Alloys Ballistically Tested at Normal and Subzero Temperatures
WATERTOWN ARSENAL LABS MA
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The object of this report was to determine the physical and metallurgical properties at both normal and subzero temperatures of two magnesium alloys 3SR and 52SR and three aluminum alloys 75ST, 24ST, and 14SW . Summary of results shows that the magnesium alloys possess a very low hardness as compared to aluminum or steel although they do have a density and consequently a thickness advantage on an equivalent weight basis. The toughness as measured by notched bars was exceeding low. The aluminum alloys examined varied in both hardness and notched bar impact strength. The 75ST exhibited the highest hardness and lowest toughness 24ST was intermediate in both, and 14SW exhibited the lowest hardness but highest toughness. The above results are comparable to the results of the ballistic test since 75ST exhibited the highest resistance to penetration and the poorest shock resistance whereas 14Sw was just the reverse. The inferiority of both magnesium and aluminum alloys is probably attributable to punching andor spalling which were generally encountered in these aluminum and magnesium alloy plates.
- Metallurgy and Metallography