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采用熔体快淬法制备了Nd_(10.5)Pr_(2.5)Fe_(80)Nb_1B_6快淬薄带,利用X射线衍射、扫描电镜分析了快淬薄带的显微组织,并用振动样品磁强计测量了其磁性能,分析了磁织构的形成机制。实验结果表明:Nd_(10.5)Pr_(2.5)Fe_(80)Nb_1B_6快淬薄带在快淬速度为5~20 m·s-1时,薄带自由面形成[006]磁织构、峰强比I(006)/I(410)为26.95~69.08,快淬薄带破碎小颗粒树脂2 T磁场固化样品的约化剩磁比为0.69~0.74,内禀矫顽力Hci=375.84~712.48 k J·m-3,最大磁能积(BH)max=105.58~157.30 k J·m-3;薄带沿与[006]织构垂直的方向测量的约化剩磁比为0.35~0.47,后者的磁能积只有前者的30%~43%。对于合适成分的钕铁硼合金,当钕铁硼熔体温度接近其熔点,熔体受辊触发以极快速度形成等轴晶、薄带自由面难以择优取向;提高钕铁硼熔体温度,在低快淬速度时在贴辊面孕育出强各向异性纳米晶等轴晶甚至可能形成织构,在等轴晶区之上生长柱状晶区具有[006]磁织构;当快淬速度增加,贴辊面不足以形成磁织构、但具有择优取向,如柱状晶区具有占整个薄带厚度的足够空间,能发展出自由面的磁织构;随着快淬速度的进一步增加,柱状晶区厚度减小,自由面难以形成织构;当快淬速度再增加时,薄带易形成非晶。
The quenched ribbon of Nd 10.5 Pr 2.5 Fe 80 Nb 1 B 6 was prepared by melt quenching method. The microstructure of quenched ribbon was analyzed by X-ray diffraction and scanning electron microscopy. The magnetic properties were measured and the formation mechanism of magnetic texture was analyzed. The experimental results show that the free surface of the ribbon is formed when the quenching speed of Nd 10.5 Pr 2.5 Fe 80 Nb 1 B 6 soft quenched ribbon is 5-20 m · s -1. (IMR) is 26.95-69.08, and the reduced remanence ratio of 2 T magnetic solidified sample of quenched thin ribbon resin is 0.69 ~ 0.74, the intrinsic coercivity Hci is 375.84 ~ 712.48 k J · m-3, the maximum energy product (BH) max = 105.58 ~ 157.30 kJ · m-3; and the reduced residual magnetization ratio of the strip measured in a direction perpendicular to the texture of [006] is 0.35 to 0.47, Of the magnetic energy product only 30% to 43% of the former. For the proper composition of NdFeB alloy, when the temperature of neodymium iron boron melt is close to its melting point, the melt is formed by the roller to form equiaxed grains with extremely fast speed, the ribbon free surface is difficult to preferentially orient; the temperature of the neodymium iron boron melt is increased, In the fast quenching speed in the roller surface bred strong anisotropic nanocrystalline equiaxed grains may even form the texture, growth in the equiaxed zone columnar crystal region with magnetic texture; when quenching speed Increase, the roller surface is not enough to form a magnetic texture, but has a preferred orientation, such as the columnar zone has a sufficient space for the entire thickness of the ribbon to develop a free surface of the magnetic texture; With the quenching speed further increased, Columnar grain thickness decreases, the free surface is difficult to form texture; when the quenching speed and then increase, the strip is easy to form amorphous.