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采用机械合金化-真空热压烧结(MA-HP)法制备了Al0.4FeCrNi Co1.5Ti0.3高熵合金。利用XRD、SEM和力学压缩试验机分析Al0.4FeCrNiCo1.5Ti0.3合金的微观组织、相转变以及力学性能。结果表明:经高能球磨10 h,合金中形成了简单固溶体fcc和bcc相,而经过热压烧结的Al0.4Fe Cr Ni Co1.5Ti0.3合金以单一fcc相及2种bcc相(bcc1、bcc2)组成。热压烧结Al0.4Fe Cr Ni Co1.5Ti0.3合金致密度达99.48%,其微观硬度(HV),屈服强度、断裂强度、压缩率分别达到725 MPa,2.13 GPa,2.54 GPa,20.1%,合金优异的力学性能主要是因为合金的固溶强化;断裂模式为解理断裂及塑性断裂的混合机制。
Al0.4FeCrNi Co1.5Ti0.3 high-entropy alloy was prepared by mechanical alloying-vacuum hot pressing sintering (MA-HP). The microstructure, phase transformation and mechanical properties of Al0.4FeCrNiCo1.5Ti0.3 alloy were analyzed by XRD, SEM and mechanical compression testing machine. The results show that the simple solid solution fcc and bcc phases are formed by high energy ball milling for 10 h, while the hot-pressed Al0.4Fe Cr Ni Co1.5Ti0.3 alloys are characterized by a single fcc phase and two bcc phases (bcc1, bcc2 )composition. The compactness of hot-pressed Al0.4Fe Cr Ni Co1.5Ti0.3 alloy is 99.48%, and its microscopic hardness (HV), yield strength, fracture strength and compressibility reach 725 MPa, 2.13 GPa, 2.54 GPa and 20.1% Excellent mechanical properties are mainly due to the solid solution alloy; fracture mode cleavage fracture and plastic fracture mechanism.