Application of Computational Thermodynamics in Magnesium Alloys
Science / Technology - Colloquium - WPI Only
Wednesday, November 4, 2009
12:00 PM-1:00 PM
Washburn Shops & Stoddard Laboratories
229
Presentation by Dr. Yu Zhong, Senior Research Engineer, Saint-Gobain
ABSTRACT
Mg-Al based alloys are one group of the most popular magnesium-based alloys that are under development. The AM series (Mg-(2-6)%Al) offered good performance at room temperature. Their use, however, is limited to low temperature applications due to poor creep property of Mg-Al based alloys. The addition of Ca and Sr into AM series alloys has been found to be beneficial to improve the mechanical properties, especially the creep resistance at elevated temperatures.
Mg-Al-Ca system in investigated in the present work with the combined approach of CALPHAD, first-principles calculations, and experiments. The existence of a (Mg,Al)2Ca C36 Laves phase is predicted by first principles calculations. Another ternary Laves phase Al2(Mg,Ca) is also predicted and verified by experiments. Mg-Al-Ca ternary thermodynamic database is updated by adding the C36 phase. Good agreement is achieved by comparing with various experimental data at different temperatures. The Mg-Al-Ca ternary database can be used to understand the reason of the good creep resistance behavior of GM-B and GM-C alloys.
Cost: Free
Suggested Audiences:
College
E-mail:
mtereq@wpi.edu
Phone: 508-831-5633
Last Modified: October 30, 2009 at 2:57 PM
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Application of Computational Thermodynamics in Magnesium Alloys
Science / Technology - Colloquium - WPI Only
Wednesday, November 4, 2009
12:00 PM-1:00 PM
Washburn Shops & Stoddard Laboratories
229
Presentation by Dr. Yu Zhong, Senior Research Engineer, Saint-Gobain
ABSTRACT
Mg-Al based alloys are one group of the most popular magnesium-based alloys that are under development. The AM series (Mg-(2-6)%Al) offered good performance at room temperature. Their use, however, is limited to low temperature applications due to poor creep property of Mg-Al based alloys. The addition of Ca and Sr into AM series alloys has been found to be beneficial to improve the mechanical properties, especially the creep resistance at elevated temperatures.
Mg-Al-Ca system in investigated in the present work with the combined approach of CALPHAD, first-principles calculations, and experiments. The existence of a (Mg,Al)2Ca C36 Laves phase is predicted by first principles calculations. Another ternary Laves phase Al2(Mg,Ca) is also predicted and verified by experiments. Mg-Al-Ca ternary thermodynamic database is updated by adding the C36 phase. Good agreement is achieved by comparing with various experimental data at different temperatures. The Mg-Al-Ca ternary database can be used to understand the reason of the good creep resistance behavior of GM-B and GM-C alloys.
Cost: Free
Sponsored by: Materials Science and Engineering Seminar Series
Suggested Audiences: College
E-mail: mtereq@wpi.edu
Phone: 508-831-5633
Last Modified: October 30, 2009 at 2:57 PM
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