本研究主要探討鐵鈀鐵磁性形狀記憶合金之磁致應變與微結構。使用真空電弧熔煉鑄造方式製備鐵鈀合金，在熔煉爐內通以保護氣氛以電弧將鐵與鈀塊材熔煉成合金，經由退火1000°C 24h、固溶化處理900°C 2h，並由900°C直接淬火等熱處理過程而獲得。以ICP分析鑄錠之成分，DSC分析其麻田散體相變化溫度，並以XRD測量其晶體結構，並以電子背向散射繞射(Electron Back Scattering Diffraction, EBSD)技術分析其晶粒方向分佈，並進行FCT及BCT麻田散體相鑑定，表面形貌以OM、SEM觀察，並藉由VSM量取物理性質，以及DIC(Digital Image Correlation)量測磁致應變。
對於Fe70Pd30及Fe71.5Pd28.5麻田散體，可由結構分析發現分別為FCT麻田散體薄板狀雙晶及BCT麻田散體透鏡狀雙晶之結構，兩者均有晶體取向差沿<100>旋轉90°，並可由相變態分析知FCT為可逆麻田散體，及BCT為不可逆麻田散體，在物理性質上兩者皆為軟磁性質，矯頑磁力均低於20 Oe，但BCT雙晶之磁性質較FCT雙晶磁性質好，在磁致應變中可得Fe70Pd30具最大應變量X方向6×10-4。

The study is focused on the relationship between magnetostriction and microstructure of Fe-Pd alloys. Fe-Pd alloys were produced using a vacuum arc-melting furnace under protective atmosphere. The specimens were obtained by annealing at 1000°C for 24h, homogenizing at 900°C for 2h and quenching directly from 900°C. The chemical compositions of the specimen were measured by ICP. XRD was applied for determination of crystal structures. EBSD (Electron Back Scattering Diffraction) was used to analyze the grain orientation and to distinguish FCT and BCT phases. The temperature of phase transformation was obtained by DSC and OM/SEM was used to observe the morphology. The hysteresis loop was obtained using VSM and DIC (digital image correlation) was applied to determine the magnetostriction during increasing magnetic field.
Fe70Pd30 and Fe71.5Pd28.5 alloys reveal that FCT phase has thin plate martensite and BCT phase has lenticular martensite. These twins of FCT and BCT phases have an angle/axis relation of <100>90°, that is, a 90° rotation angle along the <100> direction. According to results of phase transformation, martensites of FCT phase and BCT phase, which are soft magnetic and the coercivity are under 20 Oe, are reversible and irreversible, respectively. In addition, it is formed that the maximum value of magnetostriction 6×10-4 is obtained in the X direction for Fe70Pd30.

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