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MATERIAL, METALLIC, ROOM AND ELEVATED TEMPERATURE MECHANICAL PROPERTIES FOR HK31A-T5 EXTRUDED SECTIONS, DETERMINATION OF
GENERAL DYNAMICS/FORT WORTH TEX
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An investigation was made to determine the mechanical properties of extruded HK31A-T5 material Mg-Th-Zr alloy. Two extrusions, one of 15 sq in. and one of about 0.3 sq in. cross sectional area were tested. Results of the room temperature tests, conducted on these extrusions and corresponding preliminary values established by Structures Bulletin-B 46 are tabulated. Exposure to 350 F for 100 hr did not affect the properties significantly. Exposure at 475 F for 100 hr lowered the room temperature tensile and compression properties between 5 and 8. The 600 F exposure temperature reduced these properties 6 to 22. In general, all the tests results were higher than the minimum values given in Structures Bulletin-B-46. The only exceptions were values for Youngs modulus on both extrusions and the bearing ultimate strength and percentage elongation in the transverse direction of the 15 sq in. extrusion which were slightly lower. Author
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