Effect of High Magnetic Field on the Solidification Microstructure and Properties of Undercooled CrCoNi Medium-entropy Alloy

Author of the article:LIU Yudong,WEI Chen, YAN Yujie, WANG Jun

Author's Workplace：State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China

Key Words：high magnetic field; medium entropy alloy; undercooling; solidification

Abstract：The mechanism of solidification microstructure and properties of CrCoNi medium-entropy alloy at different supercooling degree under high magnetic field was studied. The results show that the average grain size of the alloy decreases from 50.1 μm to 10.1 μm and the compressive yield strength of the alloy increases from 162 MPa to 262 MPa with the increase of the supercooling degree from 98 K to 386 K without magnetic field. The average grain size of the alloy is 32. 8 μm and 9.7 μm at 76 K and 387 K undercooling, and the yield strength of the alloy is 180 MPa and 264 MPa, respectively, due to the inhibition effect of thermoelectric magnetic force on grain growth. It was found that the effect of magnetic field on microstructure and properties gradually weakened with the increase of subcooling degree.