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

A model is developed that couples a description of the continuous precipitation of β-Mg^sub 17^Al^sub 12^ 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 assump...

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Bibliographic Details
Published in:Metallurgical and materials transactions. A, Physical metallurgy and materials science Physical metallurgy and materials science, 2005-08, Vol.36 (8), p.2093-2105
Main Authors: HUTCHINSON, C. R, NIE, J. F, GORSSE, S
Format: Article
Language:English
Subjects:
Alloys
Applied sciences
Chemical precipitation
Chemical Sciences
Deformation
Exact sciences and technology
Magnesium
Material chemistry
Materials science
Metallurgy
Metals. Metallurgy
Microstructure
Shear strength
Temperature
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Summary:A model is developed that couples a description of the continuous precipitation of β-Mg^sub 17^Al^sub 12^ 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-Mg^sub 17^Al^sub 12^ 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. [PUBLICATION ABSTRACT]
ISSN:1073-5623
1543-1940
DOI:10.1007/s11661-005-0330-x