Oxide dispersion strengthened FeCoNi concentrated solid-solution alloys synthesized by mechanical alloying

Guo, Yuanhang; Li, Mingyang; Chen, Cunguang; Li, Pei; Li, Wuming; Ji, Qingzhu; Zhang, Yanwen; Chang, Yongqin

doi:10.1016/j.intermet.2019.106674

Title: Oxide dispersion strengthened FeCoNi concentrated solid-solution alloys synthesized by mechanical alloying

Journal Article · Mon Dec 09 00:00:00 EST 2019 · Intermetallics

DOI:https://doi.org/10.1016/j.intermet.2019.106674· OSTI ID:1761649

Guo, Yuanhang ^[1]; Li, Mingyang ^[1]; Chen, Cunguang ^[1]; Li, Pei ^[1]; Li, Wuming ^[1]; Ji, Qingzhu ^[1];

^[2];

^[1]

Univ. of Science and Technology, Beijing (China)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)

FeCoNi concentrated solid-solution alloys (CSAs) and its modified version strengthened by in-situ formed nano-sized particles are successfully manufactured through mechanical alloying and spark plasma sintering method. Both the as-milled powders and the bulk materials are of single face-centered cubic structure. After sintering and heat treatment, grains are refined by 68% with the addition of oxides. In oxide dispersion strengthened (ODS) FeCoNi CSAs, the majority of nano-sized particles with diameter ranging from a few to ~ 40 nm are uniformly distributed in the matrix, and most of them are identified as Y₂Ti₂O₇. Electron backscattered diffraction results reveal that the recrystallization process is suppressed due to the existence of the nano-sized particles. The size and distribution of oxide particles in the matrix can be controlled by adjusting experiment parameters of the mechanical alloying process and annealing treatment. Finally, refined grains and high-density nano-sized particles result in enhanced compressive yield strength for ODS-FeCoNi CSAs at room temperature and 700 °C, which is 1295 MPa and 127 MPa, respectively.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Natural Science Foundation of China (NSFC); Fundamental Research Funds for the Central Universities; Beijing Municipal Natural Science Foundation

Grant/Contract Number:: AC05-00OR22725; 11775017; 11175014; FRF-GF-17-B5; 2162023

OSTI ID:: 1761649

Alternate ID(s):: OSTI ID: 1702234

Journal Information:: Intermetallics, Vol. 117; ISSN 0966-9795

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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