Abstract
This study focuses on compositionally complex alloys(CCAs),aiming to achieve a balance between high strength and low density for new energy and aerospace applications.The composition of AlCrFeNiTix CCAs is strategically guided by employing density functional the-ory and the theoretical design of thermodynamic calcula-tions.Bulk CCAs,particularly AlCrFeNiTi0.25 alloy,demonstrate remarkable specific yield strength(1640.8 MPa)and 22.7％maximum strain.The incorpo-ration of Ti facilitates the formation of lightweight and high-strength L21 phase,contributing to the overall high specific strength.Synergistic effects of grain boundary strengthening,solid solution strengthening,Orowan strengthening and Peierls flow stress further enhance strength.Detailed exploration of microstructural changes during fracture reveals the role of ordered phases in sup-pressing crack propagation and absorbing energy within disordered phases,thereby improving the toughness and fracture resistance of CCAs.These methods and discov-eries establish a robust foundation for advancing the development of novel lightweight CCAs.
基金项目
Guangdong Basic and Applied Basic Research Foundation(2021A1515012626)
Shenzhen Knowledge Innovation Plan-Fundamental Research(Discipline Distribution)(JCYJ20180507184623297)
National Natural Science Foundation of China(52301043)
Postdoctoral Research Startup Expenses of Shenzhen(NA25501001)
NETL
NSTL
万方数据