首页|Design and fabrication of lightweight AlCrFeNiTix compositionally complex alloys with exceptional specific strength

Design and fabrication of lightweight AlCrFeNiTix compositionally complex alloys with exceptional specific strength

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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.

LightweightCompositionally complex alloysSpecific yield strength

Jun-Zhi Li、Wei-Zong Bao、Jie Chen、Bo-Hua Yu、Kun Zuo、Tian Gao、Ze-Yun Cai、Guo-Qiang Xie

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School of Materials Science and Engineering,Harbin Institute of Technology(Shenzhen),Shenzhen 518055,China

State Key Laboratory of Advanced Welding and Joining,Harbin Institute of Technology,Harbin 150001,China

Guangdong Basic and Applied Basic Research FoundationShenzhen Knowledge Innovation Plan-Fundamental Research(Discipline Distribution)National Natural Science Foundation of ChinaPostdoctoral Research Startup Expenses of Shenzhen

2021A1515012626JCYJ2018050718462329752301043NA25501001

2024

10.1007/s12598-024-02657-1

稀有金属(英文版)
中国有色金属学会

稀有金属(英文版)

CSTPCDEI
影响因子：0.801
ISSN：1001-0521
年,卷(期)：2024.43(7)
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