Mechanical and magnetostrictive properties of Tb0.36Dy0.64（Fe1-xMnx）1.9 alloys

The magnetization, magnetostriction and compressive strengths of arc-cast polycrystalline and directionally solidified Tb0.36Dy0.64（Fe1-xMnx）1.9 （x=0, 0.05, 0.10, 0.15, 0.20） rods were investigated by VSM, standard strain gauge method and compressive tests, respectively. The results show that the magnetostriction λs, saturation magnetization Ms and magnetocrystalline anisotropy constant K1 decrease with increasing the Mn concentration. The optical micrographs and XRD patterns show that the Tb0.36Dy0.64（Fe1-xMnx）1.9 alloys are composed of MgCu2-type Laves phase as matrix and a small amount of rare-earth rich phase. It is found that the distribution of the rare-earth rich phase has an important effect on mechanical property of Tb0.36Dy0.64（Fe1-xMnx）1.9 samples. For the arc-cast samples, smaller equal-axial grains are arranged irregularly, which results in higher compressive strengths. However, the rare-earth rich phase is arranged as parallel arrays in the directionally solidified samples, which leads to smaller compressive strengths.     

兰州电网输电线路外力破坏情况分析及对策

根据兰州电网输电线路近年来发生的外力破坏情况,对其规律及特点进行分析,提出相应的预防对策.     

兰州电网输电线路外力破坏情况分析及对策

根据兰州电网输电线路近年来发生的外力破坏情况，对其规律及特点进行分析，提出相应的预防对策。     

六氟化硫开关类设备现场检修安全技术管理

六氟化硫开关类设备是采用六氟化硫气体作为绝缘介质和灭弧介质的机电一体化设备,是电力系统中重要的控制和保护电器。主要对现阶段六氟化硫开关类设备的检修安全技术管理中所取得的经验及方法进行了阐述。