Regensburg 2022 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 24: Non-equilibrium Phenomena in Materials Induced by Electrical and Magnetic Fields 4

MM 24.6: Topical Talk

Mittwoch, 7. September 2022, 17:30–18:00, H45

From Uncovering the Mechanisms of Flash Sintering to Realizing Ultrafast Sintering without Electric Fields and Discovering Electrochemically Driven Microstructural Evolution — •Jian Luo — University of California San Diego, U.S.A.

This talk will first review our recent studies on understanding the scientific questions and technological opportunities of flash sintering [Scripta 146: 260 (2018); MRS Bulletin 46: 26 (2021)]. We originally proposed that flash sintering generally starts a thermal runaway [Acta 94:87 (2015)], but it can also be activated by bulk phase and grain boundary complexion transitions [Acta 181:544 (2019)]. We further proved that ultrafast densification is enabled by ultrahigh heating rates of ~100 K/s [Acta 125:465 (2017)]. Subsequently, a generic ultrafast high-temperature sintering was reported in a collaborative study [Science 368:521 (2020)]. Other related technologies include water-assisted flash sintering (WAFS) to flash ZnO at room temperature [Scripta 142:79 (2018)] and two-step flash sintering (TSFS) to densify ceramics with suppressed grain growth [Scripta 141:6 (2017)]. Recent research discovered electrochemically induced grain boundary transitions that can cause enhanced or abnormal grain growth [Nature Communications 12:2374 (2021)]. Subsequently, I will discuss a series of on-going studies to further investigate electrochemically controlled microstructural evolution and tailor the microstructural evolution with applied electric fields in various systems and schemes [Yan et al., unpublished work].