W.D. Fei
,
W.G. Chu and D.Z. Yang School of Material Science and Engineering
,
Harbin Institute of Technology
,
Harbin 150001
,
China
金属学报(英文版)
Fe-Co rich particles in the Alnicos samples thermomagnetically treated fo for various times at 800℃ have been found to be of self-similarity and of fractal characteristics both in two- and three-dimension space. Fe-Co rich particles for 1. 5, 3 and 5min treatments have shown a different fractal nature both in two- and in three-dimension space compared with the case for 10min, which implies that Fe-Co rich particles evolved through fifferent rent kinetic mechanisms. The fractal dimensions for 1.5, 3, 5min as well as 10min treatments derived from the SAXS data in three-dimension space are in good agreement with the theoretical dimensions for two models introduced, respectively. The fractal dimensions in two-dimension space greater than the theoretical ones for two models can be attributed to strong anisotropy of Fe-Co rich particle evolution in three-dimension space.
关键词:
Alnico8
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null
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null
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孙可卿
,
张阳明
,
卢焕明
,
王锡赞
,
程慧华
,
宋振纶
材料科学与工程学报
利用透射电镜(TEM)和X射线小角衍射技术(SAXS)研究了磁场等温退火工艺参数对Alnico8合金的微观组织的影响,样本的晶格结构清晰可见.结果表明,在等温退火阶段Alnico8合金通过调幅分解形成两相结构,棒状的铁磁相(α1相)粒子高度有序地弥散在弱磁性相(a2相)当中.其中,α1相的平均长度由SAXS测得,并与TEM照片数据进行了验证比对.本文着重研究了a1相粒子平均长度随等温退火处理的温度及时间参数的改变规律,结果显示样本的磁性能与其微观结构有一定相关性.
关键词:
Alnico8
,
调幅分解
,
微观结构
