Singh, S.; Wanderka, N.; Kiefer,K.; Siemensmeyer, K.; Banhart,J.: Effect of decomposition of the Cr-Fe-Co rich phase of AlCoCrCuFeNi high entropy alloy on magnetic properties. Ultramicroscopy 111 (2011), p. 619-622
Splat-quenched,as-cast and aged (2h at 600°C after casting)AlCoCrCuFeNi high entropy alloys were investigated by means of transmission electron microscopy and three-dimensional atom probe(3D-AP). 3D-AP revealed anti-correlated fluctuations of the Cr and Fe–Co compositions in Cr–Fe–Co-rich regions of the as-cast alloy. The ferromagnetic behavior of AlCoCrCuFeNi high entropy alloy was correlated with the decomposition of the Cr–Fe–Co-rich regions into ferromagneticFe–Co-rich and antiferromagnetic Cr-rich domains, the size of which was determined by statistic alanalysis of 3D-APdata.The splat-quenched alloy showed as ofter magnetic behavior as compared to the as-castandaged alloys.The aged alloy possessed a higher saturation magnetization and coercivity as compared to the as-cast alloy.