C对Gd的磁热性能和显微硬度的影响

Effect of C on the Magnetization, Magnetocaloric Effect and Microhardness of Gd

研究了Gd1-xCx(x≤0.05)合金的磁性、磁热性能、显微硬度。结果表明,当x≤0.05,与纯Gd比较,Gd1-xCx合金的显微硬度明显得到提高,同时居里温度,磁热性能的变化不大。含微量C的Gd1-xCx合金作制冷工质优于纯金属Gd。

In view of manufacture of magnetic refrigerator, selecting Gd as refrigerating substance is the most suitable. However, owing to the following two reasons, Gd is required to own high strength. One reason is that before working as refrigerating substance in cooling system, Gd has to be mechanically processed; the softness of Gd impedes the process. Another reason originates from the requirement of refrigerating system. So it is necessary to improve the material. By adding small amount of C to the matrix Gd, this paper studied the magnetization, magnetocaloric effect and microhardness of Gd_(1-x)C_x(x≤5at%) alloys. The results showed that when x≤5at%, comparing that of Gd, the hardness of Gd_(1-x)C_x alloys was improved obviously and at the same time, the Curie temperature and magnetocaloric effect of Gd_(1-x)C_x alloys did not deteriorate.As refrigerating substance, the Gd_(1-x)C_x alloys containing small amount of C have advantage over pure metal Gd.