合成 Cu35Co35Ni20Ti5Al5 高熵合金是否超越了固溶体形成的规律?

Samaneh Mamnooni, Ehsan Borhani, Hassan Heydari
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摘要

本研究尝试采用机械合金化法制备多组分纳米晶Cu-35Co35Ni20Ti5Al5合金。为了制备这种高熵合金,我们将原粉研磨40 h,并通过XRD、SEM、EDS和DSC分析对其进行了表征。研磨工艺使晶粒尺寸减小到纳米级,得到了晶粒尺寸为29 nm的纳米多组分粉体。根据研磨后最长时间粉末的XRD图谱和EDS图谱,铝和铜的分布较为均匀,钴的分布不均匀,而镍和钛的分布较为集中。最后,通过热力学计算阐明了Cu-35Co35Ni20Ti5Al5高熵合金不可能形成固溶体的原因。
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Is synthesizing a Cu35Co35Ni20Ti5Al5 high-entropy alloy beyond the rules of solid-solution formation?
In this research, an attempt was made to produce multi-component nanocrystalline Cu­35Co35Ni20Ti5Al5 alloy by mechanical alloying. To produce this high-entropy alloy, the primary powders were milled for 40 h and characterized by XRD, SEM, EDS, and DSC analyses. The milling process has reduced the size of the crystallites to the nanometer scale and a nanostructured multicomponent powder with a crystallite size of 29 nm was obtained. According to the XRD patterns and EDS maps of the milled powder for the longest time, aluminum and copper were homogeneously distributed, cobalt had a less homogeneous distribution than these two elements, but nickel and titanium remained in concentrated spots. Finally, thermodynamic calculations were done to clarify the reason for the impossibility of forming a solid solution for the synthesis of the Cu­35Co35Ni20Ti5Al5 high-entropy alloy.
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