Abstract
Two different microstructural architectures featuring multiple length scales have been created in the thermoelectric Mg2(SixSn1−x) system. The first one combines the nano-grain microstructure, characteristic of rapid solidification, with a large-scale pseudo-periodic pattern in one direction. The second is a layered structure in which the composition and microstructural scale vary from layer to layer. The microstructural variability is obtained by two different processing methods, in the first from the consolidation of melt-spun Mg2(SixSn1−x) alloy and in the second the sequential thermal treatment of a diffusion couple between Mg2Si and Mg2Sn. In both cases the microstructural features are consistent with the predictions of the solidification and diffusion paths followed in each process.
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