Microstructure and mechanical properties of oxide dispersion strengthened FeCoNi concentrated solid solution alloys

JOURNAL OF ALLOYS AND COMPOUNDS

卷:820

Article

Guo, Yuanhang¹  Li, Mingyang¹  Li, Pei²  Chen, Cunguang²  Zhan, Qian¹  Chang, Yongqin¹  Zhang, Yanwen^3,4 

[1] Univ Sci & Technol Beijing, Sch Mat Sci & Engn, Beijing 100083, Peoples R China

[2] Univ Sci & Technol Beijing, Inst Adv Mat & Technol, Beijing 100083, Peoples R China

[3] Oak Ridge Natl Lab, Mat Sci & Technol Div, Oak Ridge, TN 37831 USA

[4] Univ Tennessee, Dept Mat Sci & Engn, Knoxville, TN 37996 USA

关键词: Metal matrix composites;    Mechanical alloying;    Microstructure;    Phase transitions;    Mechanical properties;   

DOI  :  10.1016/j.jallcom.2019.153104

来源: Elsevier

【 摘 要 】

Microstructure and mechanical properties of two kinds of oxide dispersion strengthened concentrated solid solution alloys (CSAs), FeCoNi-1.5Y(2)O(3) (FCNY) and FeCoNi-1.2Ti-1.5Y(2)O(3) (FCNTY), are studied through a comparing investigation with FeCoNi (FCN) CSAs. All these alloys are fabricated by mechanical alloying, spark plasma sintering, hot rolling and annealing treatment. For three kinds of alloys, both the as-milled powders and bulk materials are of single face-centered cubic structure. Electron backscattered diffraction results reveal that the texture transformation is suppressed during the hot rolling process because the movement of grain boundaries is hindered by the oxide particles. Compared with FCN CSAs, grains are refined by 43% and 47% for FCNY and FCNTY CSAs, respectively. Nano-sized Y2O3 (monoclinic structure) and Y2Ti2O7 (pyrochlore structure) particles are uniformly distributed in FCNY and FCNTY CSAs, respectively. Both Y2O3 and Y2Ti2O2 particles show a semi-coherent relationship with the matrix. Yield strength of FCN, FCNY and FCNTY CSAs is 559, 981 and 1050 MPa, respectively. Theoretical calculations illustrate that high strength of FCNY and FCNTY CSAs comes from refined grains and high-density nano-sized oxide particles. (C) 2019 Elsevier B.V. All rights reserved.

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