材料科学
严重塑性变形
扭转(腹足类)
陶瓷
氧化物
离子键合
脆性
纳米晶材料
粒度
冶金
复合材料
矿物学
纳米技术
离子
化学
有机化学
外科
医学
标识
DOI:10.1002/adem.201800272
摘要
Severe plastic deformation (SPD) of oxides has been of interest in mineralogy and geology for many decades, but oxides have ionic or covalent bonds with brittle nature and can hardly be deformed at ambient temperature. SPD processing of oxides is first realized in 1930s, when Percy W. Bridgman introduce the principles of high‐pressure torsion (HPT) method. Although the method is widely used nowadays to produce ultrafine‐grained (UFG) metals, the application of method for SPD processing of oxides is quite limited. This article reviews some of the recent publications on the application of HPT method to oxide ceramics (Al 2 O 3 , ZrO 2 , TiO 2 , Y 2 O 3 , ZnO, and BaTiO 3 ) and summarizes their major findings: powder compaction and partial consolidation, nanograin formation, formation of different kinds of lattice defects such as dislocations and oxygen vacancies, strain and grain size dependence of phase transformations, and improvement of functional properties such as bandgap narrowing, photoluminescence, photocatalytic activity, and dielectricity.
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