Phase dissolution of γ-Mg17Al12 during homogenization of As-Cast AZ80 magnesium alloy and its effect on room temperature mechanical properties
Contribuinte(s) |
Suarez, Carlos E. |
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Data(s) |
01/01/2012
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Resumo |
As-cast AZ80 Mg alloy contains α-Mg, partially divorce eutectic of α and γ (Mg 17Al 12), fully divorce eutectic of α and γ, and lamellar eutectic of α and γ phases. During homogenization, second phase (γ-Mg 17Al 12) gets dissolved can change the mechanical properties. Therefore, the aim of the present work is to bring out the kinetics of dissolution of γ phase and evaluate its effect on mechanical properties. Microstructure evolution during homogenization was investigated as a function of time for 0.5 to 100 h and at the temperatures of 400° and 439°C. In as-cast state, this material was found to contain 70% α-Mg and 30% eutectic phase. With increasing homogenization time, dissolution of lamellar eutectic occurs first which is followed by dissolution of fully divorce eutectic and partially divorce eutectic. The dissolution kinetics of γ phase was analyzed based on the decrease in its volume fraction as a function of time. The time exponent for dissolution was found to be 0.38 and the activation energy for the dissolution of γ phase was found to be 84.1 kJ/mol. This dissolution of γ phase leads to decrease in hardness and tensile strength with increase in homogenization time. |
Identificador | |
Idioma(s) |
eng |
Publicador |
John Wiley & Sons |
Relação |
http://dro.deakin.edu.au/eserv/DU:30052620/evid-magnesiumconfpeerrvwgnrl-2012.pdf http://dro.deakin.edu.au/eserv/DU:30052620/kulkarni-phasedissolution-2012.pdf |
Palavras-Chave | #As-cast AZ80 magnesium alloy #homogenization treatment #mechanical properties #microstructure evolution |
Tipo |
Conference Paper |