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Thermal analysis of metastable Fe-Cu-Ag prepared by mechanical alloying

Pankhurst, QA; Cohen, NS; Odlyha, M; (1998) Thermal analysis of metastable Fe-Cu-Ag prepared by mechanical alloying. J PHYS-CONDENS MAT , 10 (7) 1665 - 1676.

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Abstract

The thermal properties of metastable Fe-Cu-Ag alloys have been investigated using differential scanning calorimetry, complementing an earlier x-ray diffraction and Mossbauer spectroscopy study. Samples were mechanically alloyed under nitrogen in a high-energy ball mill for 70 hours. DSC and x-ray data on milled and unmilled elemental powders show that Fe sustains more lattice distortion than Cu or Ag, with an rms strain of order 0.6%. In the equimolar binary alloys Fe-Cu, Fe-Ag and Cu-Ag the presence of DSC exotherms below 400 degrees C is found to correspond to a gradual decomposition of the alloy, while exotherms above 400 degrees C denote recrystallization and grain growth. The absence of low-temperature DSC exotherms in Fe-Ag confirms phase segregation in this granular alloy. In equimolar Fe-Cu-Ag, DSC curves after successive heat treatments indicate a highly disordered state, with fine-scale residual crystallinity. Heating promotes the decomposition of this metastable state into polycrystalline and segregated Fe, Cu and Ag.

Type: Article
Title: Thermal analysis of metastable Fe-Cu-Ag prepared by mechanical alloying
Keywords: GIANT MAGNETORESISTANCE, SYSTEM
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences > Eastman Dental Institute
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Med Phys and Biomedical Eng
URI: http://discovery.ucl.ac.uk/id/eprint/59480
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