The effect of a small amount of Zr addition on the temperature-dependent stability of laves phase particles and mechanical properties of Fe-13.5Cr-4.73Al-2.07Mo-(0.34-0.5)Nb-(0.65-0.98)Ta-(0-0.33)Zr(wt.％)ferritic alloys was investigated in the present study.The designed alloy ingots were hot-rolled,aged at 1073 K for 24 h,and then re-treated at 1273 K,1323 K,1373 K,and 1473 K for 1 h,respectively.It was found that the Zr addition could not only stabilize the Fe2M Laves phase(M = Mo,Nb,Ta,Zr)to a much higher temperature,but also induce the for-mation of stable Fe23Zr6 phase.The high-temperature(HT)microstructural stability of the alloys significantly was improved,as evidenced by the fact that a certain amount(0.66-1.19％)of precipitates(Fe2M,Fe23Zr6,and core(Fe23Zr6)-shell(Fe2M)-structured particles)with an appropriate size(～1.0 μm)uniformly distributed in the ferritic matrix even after being re-treated at 1473 K.Particularly,the formation of core-shell-structured particles at HTs was studied from the viewpoint of both solid solubility and diffusion coefficient of M in the matrix.All these aged alloys exhibited prominent mechanical properties at both room and elevated temperatures,showing high yield strength with σys = 490-560 MPa at room-temperature and σys = 80-85 MPa at 1073 K.The strengthening effect was further discussed in light of various strengthening mechanisms,and the calculated strength are in good agreement with the experimental results.

Ben Niu;Zhenhua Wang;Qing Wang;Sen Ge;Chuang Dong;Ruiqian Zhang;Huiqun Liu;Peter K.Liaw

Key Laboratory of Materials Modification by Laser,Ion and Electron Beams(Ministry of Education),School of Materials Science and Engineering,Dalian University of Technology,Dalian,116024,Liaoning,China;Science and Technology on Reactor Fuel and Materials Laboratory,Nuclear Power Institute of China,Chengdu,610213,Sichuan,China;School of Materials Science and Engineering,Central South University,Changsha,410083,Hunan,China;Department of Materials Science and Engineering,The University of Tennessee Knoxville,37996,Tennessee,USA

自然科学进展·国际材料（英文）

[1]Ben Niu;Zhenhua Wang;Qing Wang;Sen Ge;Chuang Dong;Ruiqian Zhang;Huiqun Liu;Peter K.Liaw-.Effect of Zr addition on the stability of precipitated Laves phase and mechanical properties of Fe-Cr-Al-based alloys at high temperatures)[J].自然科学进展·国际材料（英文）,2022(01):114-127

laves,73Al,07Mo,Fe2M,Fe23Zr6

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