|About this Abstract
||Materials Science & Technology 2012
||Symposium on the Fatigue of Materials II: Advances and Emergences in Understanding
||Effects of Intermediate Temperature Long Term Exposure on Mechanical Behavior of AL 5xxx Alloys
||Mohsen Seifi, Justin K Brosi, John J Lewandowski
|On-Site Speaker (Planned)
Al-Mg 5xxx alloys are desirable in a wide array of structural applications and provide an excellent balance of Mg solid-solution strengthening, as well as appreciable ductility after cold working. However, mechanical property changes may result from intermediate temperature exposures. Commercially available 5083-H116, 5456-H116 and 5059-H131 alloy plates have been thermally treated up to 20,000 hrs. at temperatures of 60°C , 70°C, 80°C, 100°C, 175°C. Room temperature tension, fracture toughness, fatigue crack growth and hardness tests have been completed to determine changes in mechanical properties in the LT orientation. Longitudinal splitting in the short-transverse direction has been observed during fatigue after sufficient time and temperature exposure combinations. Fatigue testing has additionally been employed on specimens in dry environment. Reductions in the amount of splitting due to these environmental effects have been observed. The evolution of properties with thermal exposure at these temperatures has significant practical implications for various structural applications.
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