中文摘要：

对Sm（CobalFe0.1Cu0.1Zr0.033）6．9合金，经810℃等温时效后以0．5℃／min逐渐冷却，在600℃—400℃温度区间淬火，研究了不同淬火温度下的磁滞回线、磁畴和矫顽力温度系数卢．发现时效600℃淬火后磁滞回线出现台阶状，说明畴壁中应存在两处钉扎．随淬火温度的降低，合金的室温矫顽力显著增加，磁滞回线的台阶消失．通过磁畴形貌发现时效600℃淬火后的磁畴接近条形畴，1：5相中Cu分布相对均匀，形成的畴壁钉扎较弱，从而使磁滞回线出现台阶，决定矫顽力的畴壁钉扎位于两相界面处；随时效淬火温度的降低，磁畴逐渐细化，畴壁1：5相中的畴壁能降低，形成了较强的内禀钉扎，并决定材料的矫顽力，两相界面处的畴壁钉扎被掩盖．对不同温度淬火合金的高温矫顽力研究表明，最强的畴壁钉扎位于两相界面处时，矫顽力随温度升高逐渐增加，矫顽力出现温度反常现象；最强的畴壁钉扎位于1：5相中心时，矫顽力随温度升高逐渐衰减．当测试温度达到500℃后不同淬火温度样品的矫顽力几乎相同，此时最强畴壁钉扎均在两相界面处．

英文摘要：

The hysteresis behaviors domain structures and temperature coefficients of coercivity are investigated in Sm（CObalFe0.1 Cuo.lZro.033）6.9, which is aged at 810 C and slowly cooled with a rate of 0.5 C/min, and then quenched at different tempera tures. It is found that the demagnetization cures show two steps clearly as the alloys are quenched at 600 C, which means that there should have two pinnings on the domain wall, and its domain structure appears more as a zigzag shape domain, which means that there should be a small gradient of Cu distribution in the 1：5 cell boundary phase and a small domain wall pinning in the cell boundary phase. The maximum domain wall pinning should be at the interface between the 1：5 cell boundary phase and 2：17 cell phase. As the alloys are quenched at a lower temperature, the steps in the demagnetization cures disappear. At the same time, their domain structures become narrower, and show more attached domains, which means that a lower domain wall energy is in the 1：5 cell boundary phase and that the maximum domain wall pinning should be in the center of the 1：5 cell boundary phase. As the maximum domain wall pinning is at the interface between the 1：5 cell boundary phase and 2：17 cell phase, the coercivity will show an abnormal temperature dependence. While as the maximum domain wall pinning is in the center of the 1：5 cell boundary phase, the coercivity will decrease with temperature increasing. As the testing temperature rises to 500 C, the coercivities for all samples nearly come to the same values, and the maximum domain wall pinnings all should come to the interface between the 1：5 cell boundary phase and 2：17 cell phase.