| Autor: |
Do Han Lee, Donghyun Kim, Taesuk Jang, Andrew-S. Kim |
| Rok vydání: |
2004 |
| Předmět: |
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| Zdroj: |
Journal of the Korean Magnetics Society. 14:196-200 |
| ISSN: |
1598-5385 |
| DOI: |
10.4283/jkms.2004.14.5.196 |
| Popis: |
In order to improve dendritic formation of NdFe14/B phase in the strip-cast Nd-Fe-B alloys that are frequently used for production of high energy sintered magnets, effect of small substitutional additives such as Cu (0.3～1.0 at. %) and Co (0.5～1.5 at.%) on the phase formation and microstructures of the strip-cast alloys based on Nd14/Fe80/B6/ were investigated. As the amount of Cu addition increased, formation of NdFe14/B dendrites along the direction normal to the strip surface was suppressed with the reduction of the strip thickness mainly due to the increase of fluidity of the melt. However, both the dendrites and their preferred orientation along the direction normal to the strip surface were improved with the increase of the strip thickness as the amount of Co addition increased. The dendrites became finer after small amount of Cu or Co was added. While small copper additions tended to stabilize the formation of primary Fe, small cobalt additions suppressed it. When small amount of Zr was added, however, the dendrite structures were totally collapsed with excessive grain growth of NdFe14/B. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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