Mechanical Alloying of W-Mo-V-Cr-Ta High Entropy Alloys

International Conference on Recent Advances in Materials & Manufacturing Technologies

Das, Sujit^1 ; Robi, P.S.^1

Department of Mechanical Engineering, Indian Institute of Technology Guwahati, Guwahati

781039, India^1

关键词: Body-centred-cubic structures;    Elevated temperature;    Field emission scanning electron microscopes;    High entropy alloys;    High temperature structural material;    Powder mixtures;    Single phase alloy;    Solid solution alloy;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/346/1/012047/pdf
DOI  :  10.1088/1757-899X/346/1/012047

来源: IOP

【 摘 要 】

Recent years have seen the emergence of high-entropy alloys (HEAs) consisting of five or more elements in equi-atomic or near equi-atomic ratios. These alloys in single phase solid solution exhibit exceptional mechanical properties viz., high strength at room and elevated temperatures, reasonable ductility and stable microstructure over a wide range of temperatures making it suitable for high temperature structural materials. In spite of the attractive properties, processing of these materials remains a challenge. Reports regarding fabrication and characterisation of a few refractory HEA systems are available. The processing of these alloys have been carried out by arc melting of small button sized materials. The present paper discusses the development of a novel refractory W-Mo-V-Cr-Ta HEA powder based on a new alloy design concept. The powder mixture was milled for time periods up to 64 hours. Single phase alloy powder having body centred cubic structure was processed by mechanical alloying. The milling characteristics and extent of alloying during the ball milling were characterized using X-ray diffractiometre (XRD), field emission scanning electron microscope (FESEM) and transmission electron microscope (TEM). A single phase solid solution alloy powder having body-centred cubic (BCC) structure with a lattice parameter of 3.15486 Å was obtained after milling for 32 hours.