铽含量对耐热钕铁硼永磁材料的磁性能的影响

Influence of Elastic Interaction Among T 1(Al 2CuLi) Precipitates on the Stability and Nucleation of Precipitates in Aluminum Lithium 2090

摘要:

研究了重稀土元素铽（Ｔｂ）的含量对末冶金烧结耐热型（Ｎｄ，Ｄｙ，Ｔｂ）２（Ｆｅ，Ｃｏ，Ｎｂ，Ｇａ）１４Ｂ永磁材料的乘磁（Ｂｒ）磁化强度矫顽力（Ｈｃｊ）和温度系数（μＢｒ）的影响。实验中，采用Ｔｂ等量取代原合金中的一部分Ｄｙ，实验结果表明，Ｔｂ含量在０ａｔ％～０．８６％ａｔ％范围内，随着合金中Ｔｂ含量啬式样的Ｈｃｊ显著增加，αＢｒ则显著减小，Ｂｒ基本上没有变化。当Ｔｂ增加到０．８６ａｔ％时，Ｂｒ仍然

Abstract:

The distribution of T 1 precipitates at the subgrain boundaries and the nucleation of secondary precipitates in the alloy aluminum lithium 2090 have been studied using TEM. The results show that the aspect ratios of the T 1 phase particles which precipitate at the subgrain boundaries is similar to or even smaller than those of nearby T 1 phases, indicating limited coarsening of the T 1 phase. It is calculated that this result conforms to the Perovic criterion, i.e. that it is necessary to balance the elastic interaction energy among the T 1 precipitates in order to stabilize the distribution of the T 1 precipitates. Small T 1 precipitates always appear at the intersection between existing T 1 phases where the nucleation energy of the T 1 phase is lower