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Modeling the precipitation processes and strengthening mechanisms in a Mg-Al-(Zn) AZ91 alloy

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Abstract

A model is developed that couples a description of the continuous precipitation of β-Mg17Al12 laths at elevated temperatures to a summation of the different contributions to the room-temperature 0.2 pct proof strength in the commercial alloy AZ91 (Mg-9Al-1Zn (wt pct)). The central assumptions are the diffusion-controlled formation of shear resistant β-Mg17Al12 laths on the basal planes of the hcp matrix and basal slip as the dominant room-temperature deformation mode. The calculations show quantitative agreement with the evolution of both the reported precipitation kinetics and the strengthening response as a function of aging time at 200 °C. The magnitudes of the different contributions to the hardening are discussed and strategies for enhancing this response are suggested.

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Authors and Affiliations

  1. School of Physics and Materials Engineering, Monash University, 3168, Clayton, Victoria, Australia

    C. R. Hutchinson (University Fellow) & J. F. Nie (Reader)

  2. Institut de Chimie de la Matière Condensée de Bordeaux et Ecole, Nationale Supérieure de Chimie et de Physique de Bordeaux, 33608, Pessac, Cedex, France

    S. Gorsse (Maitre de Conference)

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  1. C. R. Hutchinson
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  3. S. Gorsse
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Hutchinson, C.R., Nie, J.F. & Gorsse, S. Modeling the precipitation processes and strengthening mechanisms in a Mg-Al-(Zn) AZ91 alloy. Metall Mater Trans A 36, 2093–2105 (2005). https://doi.org/10.1007/s11661-005-0330-x

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