|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Ultrafine-grained Materials X
||Bulk Nanocrystalline Metals Cast under Slow Cooling
||Chezheng Cao, Gongcheng Yao, Abdolreza Javadi, Xiaochun Li
|On-Site Speaker (Planned)
When the grain size of a polycrystalline metal is below 100 nm (i.e. nanocrystalline metals), interface physics becomes significant due to the drastically increased grain boundaries, resulting in unusual properties. However, it has been a long-standing challenge to cast bulk nanocrystalline metals under slow cooling. Here we report a new discovery that nanoscale grains can be achieved under slow cooling rates (below 70 K/s) when the molten metal contains populous self-dispersed nanoparticles. It is believed that the populous nanoparticles effectively nucleate grains while restricting grain growth during solidification. The as-cast bulk nanocrystalline metal shows exceptional strengths and high temperature stability. This method paves a new way to cast bulk nanocrystalline metals for mass production.
||Planned: Supplemental Proceedings volume