YIELD STRENGTH PREDICTION FOR RAPID AGE-HARDENING HEAT TREATMENT OF ALUMINUM ALLOYS

Conference · Tue Jan 01 00:00:00 EST 2013

OSTI ID:1093059

Yin, Hebi ^[1]; Sabau, Adrian S ^[1]; Ludtka, Gerard Michael ^[1]; Skszek, Timothy ^[2]; Niu, X ^[3]

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1. ORNL
2. Vehma International of American, Inc.
3. Magna Cosma International, Promatek Research Centre

A constitutive model has been developed to predict the yield strength aging curves for aluminum casting alloys during non-isothermal age-hardening processes. The model provides the specific relationship between the process variables and yield strength. Several aging heat treatment scenarios have been investigated using the proposed model, including two-step aging recipes. Two-step aging heat treatments involve a low temperature regime to promote nucleation of secondary phases and a second step at higher temperature for the growth of the secondary phases. The predicted results show that yield strength of approximately 300MPa might be obtained in shorter aging time, of approximately 30 minutes. Thus, better mechanical properties can be obtained by optimizing the time-temperature schedules for the precipitation hardening process of heat treatable aluminum alloys.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE Office of Energy Efficiency and Renewable Energy (EERE)
• DOE Contract Number: DE-AC05-00OR22725
• OSTI ID: 1093059
• Resource Relation: Conference: 2013 TMS 142nd Annual Meeting and Exibition (TMS 2013), San Antonio, TX, USA, 20120303, 20120303
• Country of Publication: United States
• Language: English