Researchers at City University of Hong Kong (CityUHK) have reshaped the understanding of grain boundaries in crystalline materials. They discovered that grain-boundary mobility is direction-dependent, challenging the traditional belief that it is constant. Their study reveals that grain boundaries can move unidirectionally without external force, similar to a Brownian ratchet mechanism. This breakthrough has significant implications for controlling the microstructural evolution of materials and improving material properties. The findings are published in Science.
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