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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

Kulkarni, R.R., Prabhu, N., Hodgson, P.D. and Kashyap, B.P. 2012, Phase dissolution of γ-Mg17Al12 during homogenization of As-Cast AZ80 magnesium alloy and its effect on room temperature mechanical properties, in 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, 2012, John Wiley & Sons, Hoboken, N. J., pp. 543-548.

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Title Phase dissolution of γ-Mg17Al12 during homogenization of As-Cast AZ80 magnesium alloy and its effect on room temperature mechanical properties
Author(s) Kulkarni, R.R.
Prabhu, N.
Hodgson, P.D.
Kashyap, B.P.
Conference name Minerals, Metals and Materials Society. Meeting (141st : 2012 : Orlando, Florida)
Conference location Orlando, Florida
Conference dates 11-15 Mar. 2012
Title 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, 2012
Editor(s) Suarez, Carlos E.
Publication date 2012
Conference series Minerals, Metals and Materials Society Meeting
Start page 543
End page 548
Total pages 6
Publisher John Wiley & Sons
Place of publication Hoboken, N. J.
Keyword(s) As-cast AZ80 magnesium alloy
homogenization treatment
mechanical properties
microstructure evolution
Summary 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.
ISBN 9781118291214
Language eng
Field of Research 109999 Technology not elsewhere classified
Socio Economic Objective 970110 Expanding Knowledge in Technology
HERDC Research category E1 Full written paper - refereed
Persistent URL http://hdl.handle.net/10536/DRO/DU:30052620

Document type: Conference Paper
Collection: Institute for Frontier Materials
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