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Magnetic high-entropy alloy (HEA) is prospective in the application of energy conversion, hysteresis motor, electromagnetic control mechanism and other related fields. In this study, AlCoCrCuFeNi HEA was prepared by selective laser melting (SLM) with different process parameters, and the phase composition, microstructure, magnetic properties and micromechanical behavior were studied systematically. The results show that the SLMed alloys mainly consist of a BCC matrix phase with a small amount of approximately spherical FCC precipitated nanophase. The nanohardness decreases with the increase of laser power and fluctuates in a certain range with the change of scanning speed, but the whole samples show excellent micromechanical properties. Besides, it was found the roomtemperature nanoindentation creep deformation mechanism of AlCoCrCuFeNi HEAs was mainly controlled by dislocation motion, which is different from the traditional classical creep theory. Both SLMed alloys exhibit typical semi-hard magnetic properties. The saturation magnetization is affected slightly by the SLM process parameters and remains at about 43 A·m2/kg because all samples have a similar content of ferromagnetic elements (Fe,Co and Ni). However, the coercivity increases from 1.72 kA/m to 2.71 kA/m with the increase of laser power (P), and decreases from 2.37 kA/m to 1.98 kA/m with the increase of scanning speed (v), which can be attributed to the different effect of porosity and internal stress on the pinning of domain walls under different process parameters (P and v). This work provides a theoretical basis and experimental direction for further study on optimizing comprehensive magnetic properties and room temperature creep mechanism of SLMed high-entropy alloy.
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Keywords:
- Selective laser melting (SLM) /
- AlCoCrCuFeNi high-entropy alloy /
- semi-hard magnetic property /
- micro-mechanical behavior
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