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From diluted solid solutions to high entropy alloys: On the evolution of properties with composition of multi-components alloys

机译:从稀释的固溶体到高熵合金:随着多组分合金成分的发展

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摘要

To study the evolution of structural and mechanical properties with composition, 10 Cr_xMn_xFe_xCo_xNi_(100-4x) alloys were processed and characterized by X-ray diffraction and nanoindentation. Those alloys are all single-phase solid-solutions and their composition ranges from conventional diluted multi-component alloys (MCA) to high entropy alloys (HEA). The lattice parameter and the hardness were measured and were compared to existing models. The hardest studied alloy turns out to be the non-equimolar Cr_(10)Mn_(10)Fe_(10)Co_(10)Ni_(60). More precisely, it was shown that, when the composition evolves from diluted MCA to HEA: (ⅰ) the lattice parameter increases and follows a Vegard's law up to 4x=40 at%; (ⅱ) the hardness increases and follows a Mott-Nabarro-Labush law up to 4x = 40 at% and then decreases. This breakpoint of the evolution of both lattice parameter and hardness at 40 at% is proposed as the transition between conventional diluted multi-component solid solutions and HEA.
机译:为了研究结构和力学性能随组成的变化,对10种Cr_xMn_xFe_xCo_xNi_(100-4x)合金进行了加工,并通过X射线衍射和纳米压痕对其进行了表征。这些合金都是单相固溶体,其组成范围从常规的稀释多组分合金(MCA)到高熵合金(HEA)。测量晶格参数和硬度,并将其与现有模型进行比较。研究最困难的合金是不等Cr_(10)Mn_(10)Fe_(10)Co_(10)Ni_(60)。更精确地,它表明,当组合物从稀释的MCA演变为HEA时:(the)晶格参数增加并遵循Vegard定律,直至4x = 40 at%; (ⅱ)硬度增加并遵循Mott-Nabarro-Labush法则,直至4x = 40 at%,然后降低。晶格参数和硬度在40 at%时的演化断点被建议作为常规稀释多组分固溶体和HEA之间的过渡。

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