Effects on the Microstructure and Mechanical Properties of a L12-Type High-Entropy Intermetallic Alloy Dopped with Carbon
It is known that L12-type ordered intermetallic alloys are generally susceptible to brittle fracture at grain boundaries under the loading conditions,which seriously limits their practical usability.In this paper,the effects of doping Con the microstructure and mechanical properties of(Ni,Co,Fe)3(Al,Ti,Fe)high-entropy intermetallic alloys have been investigated.After deforming at room temperature and annealing at elevated temperature,the C-dopped alloy displayed a non-fully recrystallized structure in which disordered face-centered cubic structure(fcc)nanolayers can be observed at the grain boundaries.The C-dopped alloy displayed yield tensile strength of 1 015 MPa,900 MPa combined with a tensile elongation of 16％,10％at room temperature and 760 ℃,respectively.These results have affirmed that the doping of C is conducive to overcome the intergranular embrittlement of L12-type ordered intermetallic alloys,so as to achieve excellent comprehensive mechanical properties.
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