Microstructure of a near-equimolar refractory high-entropy alloy

作者：Couzinie J P^*; Dirras G; Perriere L; Chauveau T; Leroy E; Champion Y; Guillot I

来源：Materials Letters, 2014, 126: 285-287.

DOI：10.1016/j.matlet.2014.04.062

• Metals and alloys
• Metallurgy
• High-entropy alloys
• Electron microscopy
• Solidification
• Defects

The microstructure of a promising equimolar refractory high-entropy alloy containing Ti, Zr, Hf, Nb and Ta has been investigated after arc melting and induction techniques. The high-entropy alloy displays a fully disordered bcc crystal structure. At the nanoscopic scale, the observed dislocations appear mainly patterned in sub-grain boundaries in the solid solution. At the mesoscopic level and following the cooling rate, the solidified microstructure is different: the alloy exhibits a dendritic structure with the presence of Ti, Zr and Hf-rich microsegregations in the interdendritic zones for the slowest cooled parts, whereas it is fully homogenized in the regions for which the cooling rate is intense.

• 出版日期2014-7-1