Before regular use of electro-magnet of the magnetic material Alnico, aluminum nickel and cobalt is very low coercivity, high magnetic permeability, however, it is easy to demagnetization.
以前电磁铁的磁性材料常使用的铝镍钴，铝镍钴的矫顽力很低，渗磁高，但是，很容易退磁。
Two 2-17 magnets show the best reversible stability. But the high-coercivity 2-17 magnet display much better aging behavior than that of low-coercivity 2-17 magnet.
两种2-17型磁体显示最好的可逆稳定性，但高矫顽力2-17磁体的时效性能比低矫顽力2-17磁体优越得多。
Two 2-17 magnets show the best reversible stability. But the high-coercivity 2-17 magnet display much better aging behavior than that of low-coercivity 2-17 magnet.
两种2-17型磁体显示最好的可逆稳定性，但高矫顽力2-17磁体的时效性能比低矫顽力2-17磁体优越得多。
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