Effect of sintering on phase evolution in AlMgFeCuCrNi4.75 high entropy alloy

• We have synthesized the nanocrystalline AlMgFeCuCrNi4.75 high entropy alloy by mechanical alloying.
• Phase formation is being studied and is correlated with the thermodynamic parameters.
• Higher microhardness was observed and corresponding UTS is determined.

Recently, a new metallic alloy design concept has been introduced for developing novel materials for multifunctional applications which are commonly near equiatomic multicomponent alloys having at least five principal elements. These materials have been popularly known as high-entropy alloys (HEAs) due to their innate high configurational entropies associated with the mixing of large number of elements at their regular solid solution state. The AlMgFeCuCrNi4.75 HEA was synthesized by mechanical alloying and characterized by using X-ray diffraction, scanning electron microscopy and transmission electron microscopy techniques. XRD analysis of powder has confirmed that the AlMgFeCuCrNi4.75 HEA is basically composed of two cubic phases, i.e. FCC + BCC structure in as milled condition. Phase transformation in AlMgFeCuCrNi4.75 HEA due to compaction and sintering has been thoroughly examined.

Novel AlMgFeCuCrNi4.75 high entropy alloy had been synthesised by mechanical alloying. Phase analysis shows that after 20 h of mechanical alloying consists of two phase solid solution i.e. FCC + BCC. Phase transformation as a result of sintering shows the transformation from FCC + BCC to ordered FCC.Figure optionsDownload as PowerPoint slide