Mechanical properties of pulsed electric current sintered CrFeNiMn equiatomic alloy

An equiatomic CrFeNiMn alloy was consolidated using pulsed electric current sintering (PECS) from gas atomized (GA) powder. A range of temperatures applied to determine its impact on the received microstructure and material properties. It found that phase structure disc shape sintered samples varied greatly depending temperature. According X-ray diffraction (XRD) surface contained a noticeable amount BCC while in middle sample cross sections no found. Ball milling powder prior for 25 h increased density hardness 98.3% 99% 200 HV 300 HV, respectively. At same time, ultimate tensile strength 700 MPa 1000 elongation at fracture decreased 40% 25%. The enhanced were attributed grain refinement caused by sintering. Milling resulted reduction size 5.7 μm 1.9 when 1100 °C 5 min. also affect deformation mechanisms. While prepared directly GA accommodated cell-forming process twinning, refined initial such an extent twinning suppressed. In summary, single can be achieved Sintering above results single-phase FCC excluding samples. starting increases decreases material. Decrease suppresses promotes dislocation cell formation. As system does not contain cobalt as alloying element it shows great promise used nuclear applications. showed good stability during testing undergoing transformation contrary metastable austenitic stainless steel where martensite transformations take place.