时效工艺对PtCo合金磁性能的影响

研究了时效温度对PtCo合金磁性能的影响.磁性能测量结果显示，随着时效温度的增加合金的剩磁逐渐减小，时效温度为690 ℃时，合金的矫顽力达到最大值.第一步时效处理后，合金的有序度S随时效温度的提高而增加，长程有序度的增加说明合金有序相的晶粒尺寸也在增加，这是合金矫顽力变化的根本原因.第二步时效处理后，PtCo合金的微观组织结构不发生改变，有序相的各向异性场增大，使合金的矫顽力增大. 关键词： 时效温度 PtCo合金 磁性能 有序度

The effect of aging treatment on the magnetic properties of PtCo alloys

The effect of aging temperature on the magnetic properties has been studied. The magnetic measurement results indicate that the remanence decreases with increasing aging temperature T_a，and the coercivity has a maximum value at T_a=690℃. After the first aging， the degree of ordering increases with T_a， which shows that the grain size of ordered phase also increases. This is the reason for the change of the coercivity. After the second aging， the microstructure does not change and the anisotropy field of ordered phase increases， which leads to an increase in the coercivity.