Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 829, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2021.142153
Keywords
High entropy alloy; Synergistic alloying effect; Microstructure; Laves phase; Mechanical properties
Categories
Funding
- National Natural Science Foundation of China, China [51804090, 21801070, 51971086, 52071236]
- University Nursing Program for Young Scholars with Creative Talents in Heilongjiang Province [UNPYSCT-2020184]
- Scientific Research Project of Basic Scientific Research Funds in Heilongjiang Provincial Colleges and Universities [135409102]
- Natural Science Foundation of Tianjin, China [18JCYBJC87000]
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Through alloying with Nb and Mo, a new type of Laves phase with hexagonal close-packed structure was formed, and a fine lamellar structure Laves phase was obtained by adjusting the ratio of Nb and Mo, leading to enhanced strength and ductility of the CoCrFeNi alloy system.
Improving the strength of face-centered cubic high entropy alloy, CoCrFeNi, has been a research focus in recent years. In this paper, to further enhance its strength for engineering applications, a series of CoCrFeNi-(Nb, Mo) high entropy alloys were prepared using vacuum arc-melting. The synergistic effect of alloying by Nb and Mo on microstructure and mechanical properties of CoCrFeNi-based high entropy alloy were investigated. The criterion Md was used to evaluate the phase evolution for current alloy system. Through synergistic alloying with Nb and Mo, a new kind of Laves phase with hexagonal close-packed structure was formed. The Laves phase is semi coherent with the face-centered cubic matrix. Furthermore, through adjusting the ratio of Nb and Mo, fine lamellar structure Laves phase was obtained. The synergistic precipitation strengthening and solid-solution effect lead to high yield and fracture strength of 426 MPa and 714 MPa, maintaining high elongation of 17.4%. Fracture observation shows that the face-centered cubic matrix of the alloy system is ductile fracture, and the Laves phase is cleavage fracture. The results of this research would provide a basis for strengthening face centered cubic high entropy alloy through synergistic alloying effect.
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