鐵－鈀－銀合金之磁性相微結構與磁特性

Magnetic Structure and Magnetic Property of Fe-Pd-Ag Alloys

林英志(Yin-Chih Lin) ； 李驊登(Hwa-Teng Lee) ； 林建鋒(Chien-Feng Lin)

《先進工程學刊》 3卷2期 (2008/04) Pp. 123-128

https://doi.org/10.29948/JAE.200804.0004

摘要

本研究論文主要利用穿透式電子顯微鏡(TEM)，X-ray繞射儀，調幅式示差掃描量熱計(DSC)，與超導量子干涉磁化儀(SQUID)，探討鐵－30鈀－4銀磁性合金固溶處理，與固溶處理後再經400-500℃，時效於各種不同時間之磁性相微結構與磁特性關係，TEM、X-ray繞射與DSC實驗結果證實，此合金固溶與時效處理後，在fcc→L10麻田散鐵相變態間，存在一中間相，此中間相為L1(下标 m)單斜晶結構，其晶格常數為a=3.208 Å，b=3.696 Å，c=3.127 Å，及β=91.997°，此中間相可能為一種適性相麻田散鐵。
超導量子干涉磁化儀之磁性量測結果顯示，固溶處理試樣，其ZFC與FC之磁化曲線並不聚合，一直到室溫T(下標R)=300K，當試樣固溶處理，再經500℃/100小時之時效處理後，則其ZFC與FC之磁化曲線呈現鋸齒狀(serrated)，此現象表示有兩種磁性相，存在時效處理之試樣內部，此兩種磁性相包括單斜晶L1(下标 m)與序化型正方晶L10微結構，這兩種磁性相具有不同之磁異向性(magnetic anisotropy)。

關鍵字

鐵－鈀－銀合金 ； TEM與X-ray繞射 ； DSC ； 中間相L1(下标 m)微結構

並列摘要

This investigation reports on TEM, X-ray diffraction, DSC, and SQUID magnetometer study of magnetic structures formed in Fe-30Pd-4Ag alloys solution treated and then thermally aged at 400-500℃ for various times. The results reveal that an intermediate structure appears between the fcc→L10 martensitic transformation. The intermediate phase, denoted L1(subscript m,) has a monoclinic structure with lattice parameters of a=3.208 Å, b=3.696 Å, c=3.127 Å, and β=91.997°, which indicates that the monoclinic structure is possibly adaptive martensite, as confirmed by TEM, X-ray diffraction, and DSC.
The SQUID test shows that the ZFC and FC curves of the ST specimen do not coalesce until they reach room temperature at T(subscript R)=300 K. The serrated ZFC and FC curves of the specimen aged at 500℃ for 100 h indicate that two phases exist in the aged specimen. The two phases are comprised of monoclinic L1(subscript m) phase and tetragonal ordered L10 structure, which have differing magnetic anisotropy.

並列關鍵字

Fe-Pd-Ag alloys ； TEM and X-ray diffraction ； DSC ； Intermediate L1(subscript m) structure