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Article: Precipitation Hardening in Mg-Ca-Zn Alloys
- Article from:
- Metallurgical and Materials Transactions
- Article date:
- February 1, 2006
- Author:
CopyrightCopyright Minerals, Metals & Materials Society Feb 2006. Provided by ProQuest LLC. (Hide copyright information)
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Based on thermodynamic calculations, four alloys in the system Mg-Ca-Zn produced by gravity die casting were solution treated and aged at 175 °C for different times. The scanning electron microscopy and X-ray diffraction analyses of the solutionized alloys were in good agreement with the thermodynamic calculations. In these Mg-Ca-Zn alloys, the hardness increases with aging time up to 8 hours followed by typical overaging, during which the hardness decreases. According to the calculations and scanning transmission electron microscopy analyses, the change in the hardness can be correlated to the precipitation of Ca^sub 2^Mg^sub 6^Zn^sub 3^.
INTRODUCTION
INASMUCH as Mg has gained an important ...