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- 저자 : Hwa-Teng Lee (검색결과 2 건)
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Microstructure and Magnetic Property of Ferromagnetic Fe-Pd-Rh Alloys
Yin-Chih Lin,Hwa-Teng Lee 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.52 No.5
This study shows the appearance of an intermediate martensitic structure between the fcc → L10 martensitic transformation in aged Fe-30Pd-4Rh alloys. The intermediate phase (L1m) has a monoclinic structure with lattice parameters of a = 3.193 A, b = 3.684 A, c = 3.141 A and β = 92.042˚, as confirmed by transmission electron microscopy (TEM) and X-ray diffraction. The crystal orientation between L1m and L10 can be demonstrated as [101]L10//[100]L1m. This observation suggests that the observed intermediate L1m monoclinic phase may be an adaptive martensite. The magnetization (M) versus magnetic field (H) M-H curve measured at temperatures of 50, 200 and 350 K of the alloys, which were first solution-treated (ST) and then thermally aged at 450 ℃ for 100 hours, revealed an abrupt drop at the saturation remanence (Mr). This result indicates that two phases exist in the aged alloys and that the saturation remanences of these two phases differ. The two phases, i.e., the adaptive L1m monoclinic phase and the ordered L10 martensitic structure, were conrmed by TEM and X-ray studies. This study shows the appearance of an intermediate martensitic structure between the fcc → L10 martensitic transformation in aged Fe-30Pd-4Rh alloys. The intermediate phase (L1m) has a monoclinic structure with lattice parameters of a = 3.193 A, b = 3.684 A, c = 3.141 A and β = 92.042˚, as confirmed by transmission electron microscopy (TEM) and X-ray diffraction. The crystal orientation between L1m and L10 can be demonstrated as [101]L10//[100]L1m. This observation suggests that the observed intermediate L1m monoclinic phase may be an adaptive martensite. The magnetization (M) versus magnetic field (H) M-H curve measured at temperatures of 50, 200 and 350 K of the alloys, which were first solution-treated (ST) and then thermally aged at 450 ℃ for 100 hours, revealed an abrupt drop at the saturation remanence (Mr). This result indicates that two phases exist in the aged alloys and that the saturation remanences of these two phases differ. The two phases, i.e., the adaptive L1m monoclinic phase and the ordered L10 martensitic structure, were conrmed by TEM and X-ray studies.
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