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首页> 外文期刊>ISIJ international >In-situ Observation of Dislocation Motion and Its Mobility in Fe―Mo and Fe―W Solid Solutions at High Temperatures
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In-situ Observation of Dislocation Motion and Its Mobility in Fe―Mo and Fe―W Solid Solutions at High Temperatures

机译：Fe-Mo和Fe-W固溶体在高温下的位错运动及其迁移率的原位观察

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The mobilities of the edge dislocations in Fe―W and Fe―Mo solid solution alloys at high temperatures were investigated with in-situ TEM observation in order to compare the effect of W and Mo on the solid solution hardening of ferrite. The dislocation behaviors were recorded continuously with VTR. TEM observations showed that the dislocations werfe moving viscously and that the dislocation velocites were constant in both Fe―W and Fe―Mo alloys. These results show that dislocations dragged solute atmosphere. The mobilities were determined to be 5.7x10~(-15)m/(Pa·s) at 993 K in the Fe―W alloy and 4.3x10~(-15)m/(Pa·s) at 1 011 K in the Fe―Mo alloy. It was found that the mobility in the Fe-W alloy is similar to that in the Fe―Mo alloy. Mobilities were estimated by simulation using the interaction between an edge dislocation and solute atoms. The results show that the simulated value was similar to the measured value in the Fe―Mo alloy while the simulated value is different from the measured in the Fe―W alloy. The simulated mobility of the dislocation in Fe―W is one-tenth as large as that in Fe―Mo. The simulated results for Fe―W did not agree with the experimental results. It is considered that the difference between the experimental values and simulated values chiefly came from the shape of the dislocations using for measurement and the diffusion constant which was used in the simulation. Experimental results showed that the mobility in Fe―W is as large as that in Fe―Mo. Therefore, it is suggested that the effect of W on the solid solution hardening of Fe is similar to that of Mo.
机译：用原位TEM观察了Fe-W和Fe-Mo固溶合金在高温下边缘位错的迁移率，以比较W和Mo对铁素体固溶硬化的影响。用VTR连续记录脱位行为。 TEM观察表明，Fe-W和Fe-Mo合金中的位错均呈粘性运动，位错速度恒定。这些结果表明位错拖累了溶质气氛。 Fe-W合金在993 K时的迁移率确定为5.7x10〜（-15）m /（Pa·s），而在1011 K时的迁移率确定为4.3x10〜（-15）m /（Pa·s）。铁钼合金。发现Fe-W合金中的迁移率与Fe-Mo合金中的迁移率相似。通过使用边缘位错和溶质原子之间的相互作用通过模拟来估计迁移率。结果表明，模拟值与Fe-Mo合金中的测量值相似，而模拟值与Fe-W合金中的测量值不同。 Fe―W位错的模拟迁移率是Fe―Mo位错的十分之一。 Fe―W的模拟结果与实验结果不一致。认为实验值与模拟值之间的差异主要来自用于测量的位错的形状以及用于模拟的扩散常数。实验结果表明，Fe-W的迁移率与Fe-Mo一样大。因此，建议W对Fe的固溶硬化的作用与Mo相似。

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