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Magnetostriction of heavily deformed Fe-Co binary alloys prepared by forging and cold rolling

机译：锻造和冷轧制备的严重变形的Fe-Co二元合金的磁致伸缩

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摘要

Magnetostriction of Fe_(1-x)Co_x (x=50-90 at%) alloys prepared by forging and subsequent cold-rolling was studied as functions of alloy compositions and thermomechanical treatments. Magnetostriction of the as-forged Fe_(25)Co_(75) alloy was 108 ppm and that of the as-cold rolled Fe_(25)Co_(75) alloy measured parallel to the rolling direction (RD) was 128 ppm. The cold-rolled Fe_(25)Co_(75) alloy possessed a nearly {100}<011> texture, leading to the maximum magnetostriction of 140 ppm when measured at an angle of 45° to RD. Moreover, the fully annealed Fe_(25)Co_(75) and Fe_(25)Co_(80) alloys were gradually cold rolled and magnetostriction were measured. Results showed that the magnetostriction of those cold-rolled alloys drastically increased with increasing reduction rate. According to the XRD and TEM observations, intensity of the fcc peak gradually decreased with increasing reduction rate and that the alloys became to be in a bcc single state at a reduction rate higher than 90%, leading to a drastic increase in magnetostriction.
机译：研究了通过锻造和随后的冷轧制备的Fe_（1-x）Co_x（x = 50-90 at％）合金的磁致伸缩与合金成分和热机械处理的关系。锻造的Fe_（25）Co_（75）合金的磁致伸缩为108 ppm，平行于轧制方向（RD）测得的冷轧Fe_（25）Co_（75）合金的磁致伸缩为128 ppm。冷轧的Fe_（25）Co_（75）合金具有几乎{100} <011>的织构，当与RD成45°角时，导致最大磁致伸缩为140 ppm。而且，将完全退火的Fe_（25）Co_（75）和Fe_（25）Co_（80）合金逐渐冷轧并测量磁致伸缩。结果表明，这些冷轧合金的磁致伸缩随着还原率的增加而急剧增加。根据XRD和TEM观察，fcc峰的强度随着还原率的增加而逐渐降低，并且合金以高于90％的还原率变为bcc单一状态，从而导致磁致伸缩的急剧增加。

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