### Thermomechanical Characterization of Mg-9Al-1Zn Alloy Using Power Dissipation MapsThermomechanical Characterization of Mg-9Al-1Zn Alloy Using Power Dissipation Maps

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 Author Maldar, A. R. ♦ Ebrahimi, G. R. ♦ Haghshenas, Meysam ♦ Jahazi, M. ♦ Bocher, P. Source SpringerLink Content type Text Publisher Springer US File Format PDF Copyright Year ©2013 Language English
 Subject Domain (in DDC) Technology ♦ Engineering & allied operations Subject Keyword DRX ♦ hot deformation ♦ Mg-9Al-1Zn ♦ power dissipation map ♦ strain rate ♦ Characterization and Evaluation of Materials ♦ Tribology, Corrosion and Coatings ♦ Quality Control, Reliability, Safety and Risk ♦ Engineering Design Abstract A processing map is developed on the basis of the Dynamic Material Model for Mg-9Al-1Zn. The model considers the work piece as a dissipator of power and power loss variation with temperature and strain rate constitutes the power dissipation map. To this end, the thermomechanical (i.e., hot compression) characteristics of a Mg-9Al-1Zn alloy was studied in the temperature range of 250-425 °C and strain rates of 0.001-1 s$^{−1}$. The strain rate sensitivity (m), power dissipation efficiency (η), and instability parameter (ξ) are computed based on the experimental hot compression data. The deformation mechanisms of different regions in the maps are analyzed and corresponding microstructures are investigated. The processing map of Mg-9Al-1Zn alloy exhibits five workability domains. Dynamic recrystallization (DRX) was observed in three of the domains, while in the two other domains grain boundary sliding, twining, and precipitation are the dominant mechanisms. The optimum hot working conditions of Mg-9Al-1Zn alloy are located in the two domains where DRX takes place. They correspond to 375 °C/0.001 s$^{−1}$ and 380 °C/1 s$^{−1}$ with peak efficiency of 42 and 36%, respectively. ISSN 10599495 Age Range 18 to 22 years ♦ above 22 year Educational Use Research Education Level UG and PG Learning Resource Type Article Publisher Date 2013-06-20 Publisher Place Boston e-ISSN 15441024 Journal Journal of Materials Engineering and Performance Volume Number 22 Issue Number 11 Page Count 9 Starting Page 3306 Ending Page 3314

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