Strengthening mechanisms and their superposition law in an age-hardenable Mg-10 wt pct y alloy

Qiu, Dong and Zhang, Ming-Xing (2012) Strengthening mechanisms and their superposition law in an age-hardenable Mg-10 wt pct y alloy. Metallurgical and Materials Transactions A - Physical Metallurgy and Materials Science, 43 9: 3314-3324. doi:10.1007/s11661-012-1162-0


Author Qiu, Dong
Zhang, Ming-Xing
Title Strengthening mechanisms and their superposition law in an age-hardenable Mg-10 wt pct y alloy
Journal name Metallurgical and Materials Transactions A - Physical Metallurgy and Materials Science   Check publisher's open access policy
ISSN 1073-5623
1543-1940
Publication date 2012-09
Sub-type Article (original research)
DOI 10.1007/s11661-012-1162-0
Volume 43
Issue 9
Start page 3314
End page 3324
Total pages 11
Place of publication New York, NY, United States
Publisher Springer New York
Collection year 2013
Language eng
Abstract Very weak grain size dependence of yield strength is observed in a peak-aged Mg-10 wt pct Y alloy, in which the Hall-Petch slope k is only 36 pct of that in pure Mg. Such a low grain refinement strengthening response is considered as a result of strong interaction between different strengthening components, and they do not follow a linear superposition law. To determine quantitatively the superposition exponent in the superposition law, the variation of yield strength with grain size in this alloy was examined as solution treated and as peak aged, respectively. The contributions of each major strengthening component, including solid solution, precipitation, and grain refinement strengthening, were evaluated independently based on the data from microstructural characterization. The calculated superposition exponent is scattered around 1.5 with weak dependence on grain size. Furthermore, the effect of solid-solution and precipitation strengthening on the Hall-Petch parameters was also formulated and discussed.
Keyword Grain-size dependence
Plastic-deformation
Magnesium alloys
Yield strength
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mechanical & Mining Engineering Publications
Official 2013 Collection
 
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