Hard‐magnetic properties and microstructure of Sm(Co,Cu)z compounds
Hard‐magnetic properties and microstructure of Sm(Co,Cu)z compounds
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Sm(Co,Cu)z化合物的硬磁性能和显微结构
DOI：
10.1063/1.322987
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发表时间：
1976
影响因子：
3.2
通讯作者：
A. Menth
中科院分区：
文献类型：
--
作者：
H. Nagel;A. Perry;A. Menth
本文报道了Sm(Co，Cu)z合金的磁测量和金相研究。稀土(RE)与过渡金属(TM)的比例介于1 ： 5和2 ： 17之间，铜含量高达TM组分的35%。在铸态和热处理条件下对材料进行了分析。剩磁BR随成分的变化而变化。从非化学计量比的Sm(Co0.65Cu0.35)5.6到Sm2Co17相，IHc显示出最大的矫顽力。在铸态下，磁滞回线不是正方形的。高温均一化可得到理想的退磁曲线。随后在较低温度T下的热处理产生两个随T变化的矫顽力峰，峰温度随铜浓度的增加而降低，如35%铜的TM450和650 °C和20%铜的TM650和850 °C。在2 ： -17相界附近的合金中，2- ： -17作为块状初生相存在于1- ： -5基体中。磁滞回线的正方形表明，磁滞回线是垂直的。
Magnetic measurements and metallographic investigations are reported on Sm(Co,Cu)z alloys. The compositions lie between the rare‐earth (RE) to transition‐metal (TM) ratios of 1 : 5 and 2 : 17 with a content of copper of up to 35% of the TM fraction. The materials were analyzed both in the as‐cast and heat‐treatment conditions. The remanence BR scales with composition. The coercivity IHc showed a maximum along a tieline from the off‐stochiometric Sm(Co0.65Cu0.35)5.6 to the Sm2Co17 phase. In the as‐cast state the hysteresis loops are not square. High‐temperature homogenization yields ideal demagnetization curves. Subsequent annealing at lower temperatures T resulted in two coercivity peaks as a function of T. The peak temperatures decrease with increasing Cu concentration, e.g., for 35% Cu of TM 450 and 650 °C and for 20% Cu of TM 650 and 850 °C were found. Alloys near the 2 : 17 phase boundary contain 2 : 17 as a massive primary phase in a 1 : 5 matrix. The squareness of the hysteresis loops implies that t...