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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 supercooled CrCoNi medium entropy alloy
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- DOI:
- 作者:
- 刘昱东
Liu Yudong
- 作者单位:
- 西北工业大学 凝固技术国家重点实验室
State Key Laboratory of Solidification Processing, Northwestern Polytechnical University
- 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。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,合金的屈服强度也从162 MPa增加到262 MPa。施加10 T磁场后由于热电磁力对晶粒长大的抑制作用,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 the effect of different supercooling degrees on the structures and properties of CrCoNi medium-entropy alloy under a high magnetic field was investigated. The average grain size of the alloy decreased from 50.1 μm to 10.1 μm and the yield strength gradually increased from 162 MPa to 262 MPa as the supercooling degree increased from 98 K to 386 K. It was inferred that the accumulation of voids and solutes would cause remelting process at the early stage of crystal growth, thus refining the grains. After a 10 T magnetic field was applied, the average grain size was 32.8 μm and 9.7 μm for solidification at 76 K and 387 K undercoolings, respectively, and the yield strengths of the alloys were 180 MPa and 264 MPa, respectively, which was caused by the suppression of grain growth by thermo-electromagnetic forces under the magnetic field. The effect of magnetic field on the structure and properties was found to decrease with increasing undercooling.