论文部分内容阅读
本实验采用离子微探质量分析法,研究了定向凝固条件下稀土对铝硅合金中氢分布的影响。结果表明,合金凝固时,氢主要富集在固液两相凝固区内。加入适量稀土后,氢的分布发生了明显的变化,合金结晶温度区间缩小,固态溶氢量增多,氢的实际溶质分配系数有所增大,且氢的分布与稀土元素的分布有一定的对应关系。在氢分布的检测方法上采用电子探针和离子探针相结合的新尝试,其结果为探讨多相合金非平衡凝固下气体溶质再分布的规律和稀土净化机理提供了可靠的实验数据。
In this experiment, ion microprobe mass analysis method was used to study the effect of rare earth on the hydrogen distribution in Al-Si alloy under directional solidification conditions. The results show that when the alloy is solidified, hydrogen is mainly concentrated in the solidification zone. The addition of appropriate amount of rare earth, the distribution of hydrogen has undergone significant changes, the alloy crystallization temperature range narrowed, the amount of solid dissolved hydrogen increased, the actual solute distribution coefficient of hydrogen has increased, and the distribution of hydrogen and the distribution of rare earth elements have some correspondence relationship. A new attempt to combine the electron probe with the ion probe was used to detect the hydrogen distribution. The results provide reliable experimental data for exploring the rules of gas solute redistribution and the rare earth purification mechanism under the non-equilibrium solidification of heterogeneous alloy.