HUTCHINSON, Christopher R.; NIE, Jian-Feng; GORSSE, Stéphane

doi:10.1007/s11661-005-0330-x

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HUTCHINSON, Christopher R.
School of Physics and Materials Engineering

NIE, Jian-Feng
School of Physics and Materials Engineering

GORSSE, Stéphane
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

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Metallurgical and Materials Transactions A. 2005, vol. vol. 36, n° 8, p. p. 2093-2105

Springer Verlag/ASM International

Résumé en anglais

A model is developed that couples a description of the continuous precipitation of -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 -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.< Réduire

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Mechanism

Modelling

Precipitation processes

Mg-Al-(Zn) AZ91 alloy

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

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