The concept of multi-principal component has created promising opportunities for the development of novel high-entropy ceramics for extreme environments encountered in advanced turbine engines, nuclear reactors, and h...The concept of multi-principal component has created promising opportunities for the development of novel high-entropy ceramics for extreme environments encountered in advanced turbine engines, nuclear reactors, and hypersonic vehicles, as it expands the compositional space of ceramic materials with tailored properties within a single-phase solid solution. The unique physical properties of some high-entropy carbides and borides, such as higher hardness, high-temperature strength, lower thermal conductivity, and improved irradiation resistance than the constitute ceramics, have been observed. These promising properties may be attributed to the compositional complexity, atomic-level disorder, lattice distortion, and other fundamental processes related to defect formation and phonon scattering.This manuscript serves as a critical review of the recent progress in high-entropy carbides and borides, focusing on synthesis and evaluations of their performance in extreme high-temperature, irradiation, and gaseous environments.展开更多
In 2015,a team led by S.Curtarolo and J.P.Maria transplanted the concept of“high-entropy”from alloys into the ceramic domain,giving rise to a new class of materials named“high-entropy ceramics”(HECs,also known as...In 2015,a team led by S.Curtarolo and J.P.Maria transplanted the concept of“high-entropy”from alloys into the ceramic domain,giving rise to a new class of materials named“high-entropy ceramics”(HECs,also known as“compositionally complex ceramics”)[1,2].A variety of novel HECs,including high-entropy oxides(HEOs),high-entropy diborides,high-entropy carbides,highentropy nitrides(HENs),and high-entropy carbonitrides,have been developed since then[3].The short-range chemical complexity in these materials,resulting from diverse species occupying identical crystallographic sites,implies a configurational disorder that can lead to unprecedented properties surpassing those of their non-disordered counterparts.Consequently,HECs have garnered great research interest over the past decade due to their exceptional thermal,mechanical,electrical,magnetic,optical,catalytic,electrochemical,and corrosion and radiation resistance properties,along with certain biological characteristics[4e6].The boundless compositional space,unique microstructures,and versatile performance also render them very promising in broad applications ranging from structural components for engines and nuclear reactors to electronic and energy storage devices.To bring the recent advances in HECs to a wide audience,we organized this special issue in the Journal of Materiomics(JMAT).展开更多
基金funded in part by the Advanced Research Projects Agency-Energy (ARPA-E), U.S. Department of Energy, under Award Number DE-AR0001428supported by the National Science Foundation under Award ECCS: 2025298the Nebraska Research Initiative。
文摘The concept of multi-principal component has created promising opportunities for the development of novel high-entropy ceramics for extreme environments encountered in advanced turbine engines, nuclear reactors, and hypersonic vehicles, as it expands the compositional space of ceramic materials with tailored properties within a single-phase solid solution. The unique physical properties of some high-entropy carbides and borides, such as higher hardness, high-temperature strength, lower thermal conductivity, and improved irradiation resistance than the constitute ceramics, have been observed. These promising properties may be attributed to the compositional complexity, atomic-level disorder, lattice distortion, and other fundamental processes related to defect formation and phonon scattering.This manuscript serves as a critical review of the recent progress in high-entropy carbides and borides, focusing on synthesis and evaluations of their performance in extreme high-temperature, irradiation, and gaseous environments.
文摘In 2015,a team led by S.Curtarolo and J.P.Maria transplanted the concept of“high-entropy”from alloys into the ceramic domain,giving rise to a new class of materials named“high-entropy ceramics”(HECs,also known as“compositionally complex ceramics”)[1,2].A variety of novel HECs,including high-entropy oxides(HEOs),high-entropy diborides,high-entropy carbides,highentropy nitrides(HENs),and high-entropy carbonitrides,have been developed since then[3].The short-range chemical complexity in these materials,resulting from diverse species occupying identical crystallographic sites,implies a configurational disorder that can lead to unprecedented properties surpassing those of their non-disordered counterparts.Consequently,HECs have garnered great research interest over the past decade due to their exceptional thermal,mechanical,electrical,magnetic,optical,catalytic,electrochemical,and corrosion and radiation resistance properties,along with certain biological characteristics[4e6].The boundless compositional space,unique microstructures,and versatile performance also render them very promising in broad applications ranging from structural components for engines and nuclear reactors to electronic and energy storage devices.To bring the recent advances in HECs to a wide audience,we organized this special issue in the Journal of Materiomics(JMAT).
