Abstract
The precipitation phases play a critical role in affecting the properties of age-hardenable Mg alloys. The structure and morphology of the intragranular and intergranular precipitates in aged Mg-4 wt%Zn alloy were investigated by using transmission electron microscope (TEM) and high resolution TEM (HRTEM). The peak hardness of 62 HV was obtained after the alloy was aged at 150 °C for 200 h. The precipitates were composed of a large amount of β1′ and very low amount of β2′ and β. The diameter and length of β1′ rods were in the range of 15−20 nm and over 1.3 μm, respectively. The structure of β1′ was hexagonal close-packed (HCP) MgZn2 instead of Mg7Zn4. The orientation relationship between β1′ and Mg matrix was 21¯1¯0β1'// 0002Mg and 0001β1'// 21¯1¯0Mg. The oval shaped precipitate with triclinic Mg3Zn2 structure appeared preferentially at the grain boundary. Its size and morphology did not show much difference with an increase in the aging time. The thin and long β1′ rods dominated the strengthening effect of Mg-Zn alloy.
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