Microstructure and magnetic property of ferromagnetic Fe-Pd-Rh alloys

Yin Chih Lin, Hwa-Teng Lee

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

This study shows the appearance of an intermediate martensitic structure between the fcc β L10 martensitic transformation in aged Fe-30Pd-4Rh alloys. The intermediate phase (L1m) has a monoclinic structure with lattice parameters of a = 3.193 Å, 6 = 3.684 Å, c = 3.141 Åand β = 92.042°, as confirmed by transmission electron microscopy (TEM) and X-ray diffraction. The crystal orientation between L1 m 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 °C 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 L1 0 martensitic structure, were confirmed by TEM and X-ray studies.

Original languageEnglish
Pages (from-to)1410-1414
Number of pages5
JournalJournal of the Korean Physical Society
Volume52
Issue number5
DOIs
Publication statusPublished - 2008 Jan 1

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remanence
magnetic properties
microstructure
saturation
transmission electron microscopy
martensitic transformation
martensite
lattice parameters
x rays
magnetization
curves
diffraction
magnetic fields
crystals
temperature

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

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title = "Microstructure and magnetic property of ferromagnetic Fe-Pd-Rh alloys",
abstract = "This study shows the appearance of an intermediate martensitic structure between the fcc β L10 martensitic transformation in aged Fe-30Pd-4Rh alloys. The intermediate phase (L1m) has a monoclinic structure with lattice parameters of a = 3.193 {\AA}, 6 = 3.684 {\AA}, c = 3.141 {\AA}and β = 92.042°, as confirmed by transmission electron microscopy (TEM) and X-ray diffraction. The crystal orientation between L1 m 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 °C 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 L1 0 martensitic structure, were confirmed by TEM and X-ray studies.",
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Microstructure and magnetic property of ferromagnetic Fe-Pd-Rh alloys. / Lin, Yin Chih; Lee, Hwa-Teng.

In: Journal of the Korean Physical Society, Vol. 52, No. 5, 01.01.2008, p. 1410-1414.

Research output: Contribution to journalArticle

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AB - This study shows the appearance of an intermediate martensitic structure between the fcc β L10 martensitic transformation in aged Fe-30Pd-4Rh alloys. The intermediate phase (L1m) has a monoclinic structure with lattice parameters of a = 3.193 Å, 6 = 3.684 Å, c = 3.141 Åand β = 92.042°, as confirmed by transmission electron microscopy (TEM) and X-ray diffraction. The crystal orientation between L1 m 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 °C 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 L1 0 martensitic structure, were confirmed by TEM and X-ray studies.

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