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Metals and Materials International

, Volume 23, Issue 4, pp 660–672 | Cite as

Constitutive modeling and understanding of the hot compressive deformation of Mg–9.5Zn–2.0Y magnesium alloy with reduced number of strain-dependent constitutive parameters

  • Woo Jin Kim
  • Tae Yang Kwak
Article

Abstract

The hot compressive flow behavior of the cast Mg–9.5Zn–2.0Y alloy as a function of strain was analyzed, and the degree of dependence of the parameters (A: material constant, n 2: stress exponent, Q c: activation energy for plastic flow and α: stress multiplier) of the constitutive equation (\(\dot \varepsilon = A{\left[ {\sinh \left( {\alpha \sigma } \right)} \right]^{{n_2}}}\exp \left( {\frac{{ - {Q_c}}}{{RT}}} \right)\)) upon the strain was examined in a systematic manner. This is to explore the possibility of representing the hot compressive deformation behavior of metallic alloys in a simple way by using a reduced number of strain-dependent constitutive parameters. The analysis results for several different cases can be interpreted as follows: (1) Q c can be treated as being strain-independent, which is physically sensible; (2) while only the microstructure changes as a function of strain at low flow stresses, as the flow stress increases, the power-law creep deformation and power-law breakdown mechanisms change; (3) the regime where only A is strain dependent expanded to higher strain rates and lower temperatures as the strain increased, suggesting that the number of the strain-dependent parameters decreases as the initial microstructure is refined by dynamic recrystallization, and the microstructure approaches a steady state.

Keywords

alloys casting mechanical properties constitutive modeling compression test 

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Copyright information

© The Korean Institute of Metals and Materials and Springer Science+Business Media Dordrecht 2017

Authors and Affiliations

  1. 1.Department of Materials Science and EngineeringHongik UniversitySeoulRepublic of Korea
  2. 2.Advanced Process and Materials R&D GroupKorea Institute of Industrial TechnologyIncheonRepublic of Korea

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