文献类型：期刊文献

英文题名：Strengthening and deformation mechanisms of laser additively manufactured Ni₂CoCrNb_0.2V_0.2 medium-entropy alloy: Cryogenic to elevated temperatures

作者：Wang, Fangping Huang, Fang Guo, Yaxiong Liu, Qibin Liao, Tianhai

第一作者：Wang, Fangping

通信作者：Liu, QB[1]

机构：[1]Guizhou Univ, Coll Mat & Met, Guiyang 550025, Peoples R China;[2]Guiyang Vocat & Tech Coll, Guiyang 550081, Peoples R China;[3]Guizhou Inst Technol, Guiyang 550003, Peoples R China;[4]Key Lab Modern Mfg Technol Educ Minist, Guiyang 550025, Peoples R China

第一机构：Guizhou Univ, Coll Mat & Met, Guiyang 550025, Peoples R China

通信机构：corresponding author), Guizhou Univ, Coll Mat & Met, Guiyang 550025, Peoples R China.

年份：2024

卷号：93

外文期刊名：ADDITIVE MANUFACTURING

收录：;WOS:【SCI-EXPANDED(收录号:WOS:001319950100001)】；

基金：This research was supported by the National Natural Science Foundation of China (NO.52164044) ; the National Natural Science Foundation of China (NO.52365021) ; the Natural Science Foundation of Guizhou Province of P. R. China (2022 [053] ) ; the Talent Growth Plan of Guizhou Education Department of P. R. China (Jiao He KY No. [2022] 137) ; and the Plan of Key Laboratory of Advanced Manufacturing Technology of the Ministry of Education of Guizhou University, P. R. China (No. GZUAMT2021KF [12] ) .

语种：英文

外文关键词：Additive manufacturing; Medium-entropy alloy; Stacking fault energy; Nanoparticle-strengthened; Extreme temperature

摘要：To develop a medium-entropy alloy (MEA) with a high yield strength at temperatures ranging from cryogenic (-196 degrees C) to elevated (800 degrees C) temperatures, a strategy for strengthening nanoparticle precipitation while reducing the MEA stacking fault energy (SFE) is proposed. A novel Ni2CoCrNb0.2V0.2 MEA suitable for additive manufacturing (AM) was designed according to the first-principles calculations and the calculation of phase diagrams (CALPHAD) technique. Bulk MEA samples were printed using laser-directed energy deposition (LDED) with a vibration field. First-principles calculations indicated that V addition could reduce the SFE and stabilize the gamma '' strengthening '' strengthening phase. The aged MEA had excellent yield strengths of 1398 MPa and 751 MPa at-196 degrees C and 650 degrees C, respectively. The specific strength of the MEA reached 94.16 MPa g(- 1) cm(- 3) at 650 degrees C. The deformational mechanism transforms from stacking fault (SF), deformation twin (DT), and Lomer-Cottrell (L-C) lock synergy to slip-dominated plasticity when the tensile temperature increases from-196 degrees C to 800 degrees C. This research provides new theoretical guidance for developing AM-ed MEAs with an ultrastrong combination of strength and ductility for extreme temperatures applications.