Abstract
The precipitation in a Mg-6 wt% Sn alloy under electron irradiation has been investigated by in-situ heat treatment at 200 °C in a transmission electron microscope. Electron irradiation produced a high number density (9.78 ± 1.27 × 1021 m−3) of fine β-Mg2Sn precipitates with the average length close to 15 nm whereas the β-Mg2Sn precipitates formed in the region without electron irradiation have a low number density of 2.55 ± 0.68 × 1019 m−3 and a coarse size averaging around 200 nm. The β-Mg2Sn precipitates formed with and without electron irradiation have the same orientation relationship with the Mg matrix:11¯00Mg//112β,0002Mg//22¯0β with the habit planes parallel to the basal (0001)Mg plane. Experimental results clearly demonstrate that electron irradiation is effective in refining the precipitate distribution in the Mg-6 wt% Sn alloy and the possible underlying mechanisms are discussed in relation to the supersaturation of vacancies and interstitials produced by electron irradiation.
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