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强磁场对 CrCoNi 中熵合金过冷凝固组织与 性能的影响
Effect of High Magnetic Field on the Solidification Microstructure and Properties of Undercooled CrCoNi Medium-entropy Alloy
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- DOI:
- 作者:
- 刘昱东，魏 晨，闫育洁，王 军
LIU Yudong,WEI Chen, YAN Yujie, WANG Jun
- 作者单位:
- 西北工业大学 凝固技术国家重点实验室，陕西 西安 710072
State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China
- 关键词:
- 强磁场；中熵合金；过冷；凝固
high magnetic field; medium entropy alloy; undercooling; solidification
- 摘要:
- 研究了强磁场下 CrCoNi 中熵合金不同过冷度下凝固组织和性能的作用机制。 结果表明，无磁场时，随
着过冷度从 98 K 提高到 386 K， 合金的平均晶粒尺寸从 50.1 μm 减小至 10.1 μm， 合金的抗压屈服强度也从 162 MPa
增 加 到262 MPa。 施加 10 T 磁场后， 晶粒尺寸明显减小，76 K 过冷度和 387 K 过冷度下合金的平均晶粒尺寸分别为
32.8 μm 和 9.7 μm，合金的抗压屈服强度分别为 180 MPa 和 264 MPa。 对比发现，随着过冷度增大，磁场对组织和性能
的影响逐渐减弱。
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.