BULK FERROMAGNETIC GLASSES IN THE Fe-Ni-P-B SYSTEM
BULK FERROMAGNETIC GLASSES IN THE Fe-Ni-P-B SYSTEM
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DOI：
10.1016/s1359-6454(00)00365-7
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发表时间：
2001-03
期刊：
影响因子：
9.4
通讯作者：
T. Shen;R. Schwarz
中科院分区：
文献类型：
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作者：
T. Shen;R. Schwarz
铁磁金属玻璃Fe_（40）Ni_（40）P_（14）B_6只有30-50 μm厚，在过去的30年里得到了广泛的研究。我们采用助熔剂熔化和水淬技术制备了直径为2 mm的球形和直径为1 mm的棒状的大块非晶Fe_（40）Ni_（40）P_（14）B_6合金。块体玻璃的居里温度高于快速淬火带的居里温度平均值。大块玻璃的玻璃化转变温度和晶化温度分别低于和高于快速淬火带的平均值，使得过冷液体区域宽达42 K。大块玻璃通过均匀成核然后以恒定速率生长来结晶。在散装玻璃的成核率是四个数量级低于在快速淬火带，这表明，以前的厚度限制是由于熔体中的杂质（非均质成核）。
The ferromagnetic metallic glass Fe40Ni40P14B6, available only as 30–50 μm thick ribbons, has been extensively studied over the last three decades. We used a flux-melting and water-quenching technique to prepare bulk glassy Fe40Ni40P14B6alloys in the form of 2-mm diameter spheres and 1-mm diameter rods. The Curie temperature for the bulk glasses is higher than the average value of Curie temperatures reported for the rapidly quenched ribbons. The glass-transition temperature and the crystallization temperature of the bulk glasses are lower and higher, respectively, than the average values reported for rapidly quenched ribbons, making the supercooled-liquid region as wide as 42 K. The bulk glasses crystallize by a homogeneous nucleation followed by a growth at a constant rate. The nucleation rate in the bulk glasses is four orders of magnitude lower than in the rapidly quenched ribbons, suggesting that the previous thickness limitation was due to impurities in the melt (heterogeneous nucleation).