Wear resistance and high-temperature compression strength of Fcc CuCoNiCrAl0.5Fe alloy with boron addition

Abstract

This study discusses the wear resistance and high-temperature compression strength of CuCoNiCrAl 0.5 Fe alloy with various amounts of boron addition. Experiments show that within the atomic ratio of boron addition from x ϭ 0 to x ϭ 1.0 in CuCoNiCrAl 0.5 FeB x (referred to as B-0 to B-1.0 alloys), the alloys are of fcc structure with boride precipitation. The volume fraction of borides increases with increasing boron addition. The corresponding hardness increases from HV 232 to HV 736. Wear resistance and high-temperature compression strength are significantly enhanced by the formation of boride. The alloys with boride are less tough. The superior wear resistance of B-1.0 alloy, which is even better than SUJ2 wear-resistant steel, indicates that the CuCoNiCrAl 0.5 FeB x alloys have potential applications as ambient-and high-temperature mold, tool, and structural materials.

High-Entropy Alloys: A Critical Review

“…In the same year, the existence of (Cr, Fe)-rich borides in the AlB x CoCrCuFeNi alloys was observed. [14] As mentioned previously, it is the competition between entropy and enthalpy that determines the phase formation. The large negative formation enthalpy of the borides thus justifies their stability at high temperatures.…”

“…For example, no phase formation was found in the Co-Cr-Fe-Mn-Ni FCC alloys during their high-temperature annealing. [14,17] For alloys that locate in the BCC+FCC phase region, Figure 7. Relationship between the VEC and the presence of σ phase after aging for a number of HEAs.…”

“…These compounds also lead to evident hardening. For example, the hardness of AlCoCrFeNiSi [90] and AlBCoCrCuFeNi [14] are HV 738 and HV 740, respectively. Compound formation also causes loss of toughness.…”

“…Wear properties of HEAs, under both abrasive [7,14,51,75,94,107] and adhesive [50,66,80] conditions, have been tested in a number of systems. The adhesive wear properties of tested HEAs are summarized in Figure 9.…”

“…[122][123][124] Non-metallic elements such as C, B, and N can also be incorporated to achieve even higher strength. [14,99,100,125,126] Additionally, HEAs can also be prepared by other process and/or in other forms. For example, HEAs can be processed by a wrought process including homogenization, hot/cold working, and annealing [62,64] to eliminate casting defects and improve microstructure.…”