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理论分析表明,第二相的迁移行为可以通过迁移速度进行表征.影响迁移速度的因素包括第二相和熔体的物理性质、磁场强度和梯度大小、第二相的形状和体积等因素.强磁场下洛伦兹力的效果为促进第二相在基体中的均匀分布,其效率在磁场强度大于某一定值时逐渐降低.在梯度强磁场条件下,第二相迁移行为和分布状态的主要控制参数是梯度磁场下的磁化力.在磁场梯度较小时,因洛伦兹力的制约磁化力控制第二相迁移的效果不明显,随着磁场梯度的增加,磁化力的作用效果逐渐增强.通过研究强磁场下Al-Si合金、Al-Ni合金中原位自生第二相的迁移行为实验验证了理论分析结果.
The theoretical analysis shows that the migration behavior of the second phase can be characterized by the migration velocity.The factors affecting the migration velocity include the physical properties of the second phase and the melt, the magnitude of the magnetic field and gradient, the shape and volume of the second phase, etc. Strong The effect of Lorentz force in the magnetic field is to promote the uniform distribution of the second phase in the matrix, and the efficiency of the second phase decreases gradually when the magnetic field is greater than a certain value. Under the gradient high magnetic field, the migration and distribution of the second phase The control parameter is the magnetizing force in the gradient magnetic field.When the magnetic field gradient is small, the effect of controlling the second phase migration due to the Lorentz force constrained magnetization is not obvious, and the effect of the magnetizing force gradually increases with the increase of the magnetic field gradient. The theoretical analysis of the in-situ second phase migration in Al-Si alloy and Al-Ni alloy was verified by experimental study.