Plastically deforming ZrO2-SiO2 dual-phase nanocrystalline ceramics via dynamic hot forging and the associated microstructural changes
发布时间：2024-05-30
点击次数：
DOI码：10.1016/j.ceramint.2024.05.452
发表刊物：Ceramics International
摘要：Due to the intrinsic brittleness of ceramics, it is challenging to shape and plastically deform them. In this study, we plastically deformed ZrO2-SiO2 dual-phase nanocrystalline ceramics (DPNCs) by an oscillatory pressure-assisted hot forging method, termed as “dynamic hot forging” (DHF). Under the synergistic effects of oscillatory pressure (60±5 MPa, 2 Hz) and heat (1250 °C), significant dimensional changes of the DPNCs occurred after DHF. The as-sintered DPNCs consisted of tetragonal ZrO2 nanocrystallites (NCs) embedded in an amorphous SiO2 matrix. The forging process did not significantly alter the phase composition of the DPNCs, but obvious coarsening of ZrO2 NCs occurred during DHF. Microstructural observations showed that the DPNCs deformed predominately through the viscous flow of amorphous SiO2 at high temperature. No microcracks were observed although the DPNCs experienced large deformation. The morphology of ZrO2 NCs did not significantly changed, i.e., they maintained a near-spherical morphology before and after forging. However, a large number of lattice defects in ZrO2 NCs were formed due to forging, including edge dislocations, subgrain boundary, nanotwins, and stacking faults. The formation of lattice defects did not cause significant effect on the microhardness of the DPNCs. The results of this study suggest that DHF process is a promising technique to plastically deform and shape ceramics with crystalline-amorphous dual-phase microstructure.
合写作者：Wenjun Yu, Dianguang Liu*
第一作者：Le Fu*
论文类型：期刊论文
卷号：50
期号：17
页面范围：31451-31460
是否译文：否
发表时间：2024-05-30
收录刊物：SCI
发布期刊链接：https://www.sciencedirect.com/science/article/pii/S0272884224023344