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Novel Co-rich high entropy alloys with superior tensile properties

机译:具有优异拉伸性能的新型富钴高熵合金

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We developed a series of Co-rich Co_(x)Cr_(25)(FeNi)_(75?x) (x ?=?35, 45, 55, 65) high entropy alloys with improved strength and/or ductility, derived from lowering the stacking fault energy (SFE) and reducing the fcc phase stability of the equiatomic CoCrFeNi alloy. Thermodynamics and ab initio calculations demonstrated that increasing Co while decreasing Fe and Ni concentrations lower the SFE and reduce the fcc phase stability. The Co_(35)Cr_(25)Fe_(20)Ni_(20) and Co_(45)Cr_(25)Fe_(15)Ni_(15) alloys with single fcc phase, exhibit superior tensile properties, contributing to the twinning and fcc → hcp martensitic transformation. The present study offers a guideline for designing high-performance high entropy alloys.
机译:我们开发了一系列富含钴的Co_(x)Cr_(25)(FeNi)_(75?x)(?x?=?35、45、55、65)高熵合金,具有改善的强度和/或延展性源自降低堆垛层错能(SFE)和降低等原子CoCrFeNi合金的fcc相稳定性。热力学和从头算的计算表明,增加Co而降低Fe和Ni浓度会降低SFE并降低fcc相的稳定性。具有单fcc相的Co_(35)Cr_(25)Fe_(20)Ni_(20)和Co_(45)Cr_(25)Fe_(15)Ni_(15)合金表现出优异的拉伸性能,有助于孪晶和fcc→hcp马氏体转变。本研究为设计高性能高熵合金提供了指导。

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