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Phase dissolution of γ-Mg17Al12 during homogenization of As-Cast AZ80 magnesium alloy and its effect on room temperature mechanical properties
conference contribution
posted on 2012-01-01, 00:00 authored by R Kulkarni, N Prabhu, Peter HodgsonPeter Hodgson, B KashyapAs-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.
History
Event
Minerals, Metals and Materials Society. Meeting (141st : 2012 : Orlando, Florida)Pagination
543 - 548Publisher
John Wiley & SonsLocation
Orlando, FloridaPlace of publication
Hoboken, N. J.Start date
2012-03-11End date
2012-03-15ISBN-13
9781118291214Language
engPublication classification
E1 Full written paper - refereedEditor/Contributor(s)
C SuarezTitle of proceedings
TMS 2012 : Light metals 2012 : Proceedings of the technical sessions presented by the TMS Aluminum Committee at the TMS 2012 Annual Meeting & Exhibition, Orlando, Florida, USA, March 11-15, 2012Usage metrics
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