High-temperature Mechanical Properties and Dynamic Recrystallization Mechanism of in situ Silicide-reinforced MoNbTaTiVSi Refractory High-entropy Alloy Composite  

作　　者：Shaofan Ge Shifeng Lin Huameng Fu Long Zhang Tieqiang Geng Zhengwang Zhu Zhengkun Li Hong Li Aimin Wang Hongwei Zhang Haifeng Zhang 

机构地区：[1]Shi-Changxu Innovation Center for Advanced Materials,Institute of Metal Research,Chinese Academy of Sciences,Shenyang,110016,China [2]School of Materials Science and Engineering,University of Science and Technology of China,Hefei,230026,China [3]CAS Key Laboratory of Nuclear Materials and Safety Assessment,Institute of Metal Research,Chinese Academy of Sciences,Shenyang,110016,China [4]Dongguan Eontec Co.,Ltd,Dongguan,523662,China

出　　处：《Acta Metallurgica Sinica(English Letters)》2022年第10期1617-1630,共14页金属学报（英文版）

基　　金：financially supported by the National Key Research and Development Program(No.2018YFB0703402);the National Natural Science Foundation of China(Nos.51790484,52074257);the Chinese Academy of Sciences(No.ZDBS-LY-JSC023);the Dongguan Innovative Research Team Program(No.2014607134);the Science and Technology on Transient Impact Laboratory(No.6142606192208).

摘　　要：The hypoeutectic composite material composed of BCC phase and in situ precipitated Ti_(5)Si_(3) was prepared by adding Si into MoNbTaTiV high-entropy alloy.The obvious oriented in situ Ti_(5)Si_(3) phase formed eutectic phase with BCC phase in the inter-dendritic area,which leads to excellent properties of the composite.The alloy exhibits ultra-high yield stress of 718 MPa at 1200℃ and obvious compression plasticity.After reaching the maximum strength,dynamic recovery(DRV)and dynamic recrystallization(DRX)caused soften phenomena.The DRX mechanism of the dual-phase eutectic structure is analyzed by electron backscatter diffraction.The DRX of the BCC phase conforms to the discontinuous DRX and continuous DRX mechanisms,while the Ti_(5)Si_(3) phase has a geometric DRX mechanism in addition to the above two mechanisms.The high performance of this composite has enough potential high-temperature applications such as nuclear and aero engine.

关 键 词：Refractory high-entropy alloy composite Mechanical properties In situ silicide compound Dynamic recrystallization 

分 类 号：TB333[一般工业技术—材料科学与工程]