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研究了压力对FeSi2 合金凝固组织的影响 .与常压下凝固的典型共晶组织不同 ,高压条件下的凝固组织为初生ε相树枝晶加离异共晶 .高压下凝固组织的变化主要是与压力对相图的影响和对凝固过程中溶质原子扩散的影响有关 .通过引入压力参量 ,推导了高压凝固过程中的成分过冷判据 ,并应用该判据分析了高压凝固树枝晶组织的形成机理 .
The effect of pressure on the microstructure of the FeSi2 alloy was investigated. Unlike the typical eutectic structure solidified at atmospheric pressure, the solidified microstructure under high pressure was primary ε-phase dendrites plus deuterated eutectic. The changes of the solidified microstructure under high pressure were mainly related to the pressure The influence of phase diagram on the diffusion of solute atoms in the solidification process is related to the influence of the diffusion of solute atoms in the solidification process.According to the pressure parameters, the criterion of undercooling in high-pressure solidification process is deduced and the formation mechanism of dendrite structure .