[001]取向 Ni 单晶、NiCo、NiCoCr 和NiCoCrFe 单晶合金的力学性能

In this paper, the room temperature compression and tensile properties, microhardness and elastic modulus of face center cubic (FCC) structure Ni, NiCo, NiCoCr and NiCoCrFe single crystals with [001] orientation were studied, and the influencing factors of solid solution strengthening degrees of FCC structure multicomponent single crystals were also explored. The results show that the orders of compression yield strength σ_{0.2, c}, yield strength σ_0.2, t, tensile strength, microhardness and elastic modulus of Ni, NiCo, NiCoCr and NiCoCrFe single crystals are all NiCoCr＞NiCoCrFe＞NiCo＞Ni. The lattice constants of Ni, NiCo, NiCoCr and NiCoCrFe single crystals increases with increasing number of principal elements, which indicates that the lattice constant is not the major influencing factor of solid solution strengthening degrees of [001] orientation multi-component single crystals. Meanwhile, NiCoCr alloy has the largest atomic radius difference, electronegativity difference and elastic modulus, and the lowest stacking fault energy, i.e. the strengths and hardnesses of FCC structure multi-component alloys with [001] orientation are positively correlated with atomic radius difference, electronegativity difference and elastic modulus, and inversely correlated with stacking fault energy. Moreover, based on lattice friction stress and intrinsic residual strain of FCC structure multi-component single crystals with [001] orientation and polycrystals, a solid solution strengthening model was built.