Superplasticity in a commercially extruded ZK30 magnesium alloy
2018
Álvarez Leal, Marta | Orozco-Caballero, A. | Carreño, Fernando | Ruano, Oscar Antonio | European Commission | Consejo Superior de Investigaciones Científicas (España) | Ministerio de Economía y Competitividad (España) | Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
The high temperature mechanical behavior of a commercial ZK30 magnesium alloy was studied by means of tensile tests at various temperatures and strain rates. This behavior was related to the complex as-received microstructure that evolves during testing to a microstructure formed by few large grains (≈ 30 µm) combined with a large amount of small grains (1–5 µm). Large elongations to failure up to 360% and low apparent stress exponents between 2.6 and 2.9 at low strain rates are a hint of the activation of grain boundary sliding as the controlling deformation mechanism. This is corroborated by the equiaxed microstructure after testing. The stress exponents higher than 2 are attributed to the accelerated grain growth of the dual grain size microstructure.
Show more [+] Less [-]Financial support from MINECO (Spain), Projects MAT2012-38962 and MAT2015-68919-R (MINECO/FEDER) is gratefully acknowledged. M. Álvarez-Leal thanks MINECO for a FPI fellowship, number BES-2013-063963. A. Orozco-Caballero also thanks CSIC for a JAE-Pre fellowship, co-funded by the European Social Fund. FSE 2007–2013.
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