Fe_(72.7)Cu_1Nb_2V_(1.8)Si_(13.5)B_9合金的热磁分析

MAGNETOTHERMAL ANALYSIS OF Fe_(72.7)Cu_1Nb_2V_(1.8)Si_(13.5)B_9 ALLOY

研究了Fe(72.7)Cu1Nb2V(1.8)Si(13.5)B9非晶合金在不同温度（763—883K）退火1h后的热磁曲线（σs－T曲线）借助于碰分析的方法，由σs1/B－T曲线并通过X射线衍射分析确定了合金中α－Fe（Si）相和剩余非晶相的体积分数、饱和磁化强度及Curie温度随退火温度Ta的变化及其相互关系.结果表明，当Ta＜823K时α－Fe（Si）相的饱和磁化强度σsα和Curie温度随Ta的增加略有下降，当Ta≥823K时σsα和TCα保持不变；剩余非晶相的饱和磁化强σsA度和Curie温度在整个退火温度范围内均随Ta的增加而单调下降并且两者之间呈近似直线关系。

Thermomagnetic curves (σs-T curve) of Fe(72.7)Cu1Nb2V(1.8)Si(13.5)B9 alloy annealed at different temperatures (763-883 K) for 1h were investigated by magnetic analysis.Based on theσs1/8 -T curve and X-ray diffraction analysis, the changes in volume fraction,saturation magnetization and Curie temperature of α-Fe(Si) phase and residual amorphous phase with annealing temperatures as well as the correlation between them were determined.The results showed that the saturation magnetization and Curie temperature of α-Fe(Si)phase, σsαand were decreased a little with increasing of Ta when Ta< 823 K and then invariable for Ta≥823K. The saturation magnetization and Curie temperature of residual amorphous phase,σsα and TCα were all decreased monotonically with increasing of Ta in the whole annealing process and had a linear correlation between them. The dependences of magnetic coupling between α-Fe(Si) grains and of saturation magnetostriction on volume fractions of each phase were also discussed.