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<p>Nanometric Cr<sub>70</sub>Co<sub>30</sub> powders mixture was obtained by ball milling from highly purified Cr and Co powders using a planetary ball mill under an argon atmosphere. Microstructural and structural parameters were deduced from Rietveld refinement of the XRD patterns. Thermal stability and forming of nanostructured Cr<sub>70</sub>Co<sub>30</sub> powders were studied by differential scanning calorimetry and sintering in solid phase at a heating temperature of 950&#xa0;°C. The X-ray diffraction results along with Rietveld refinement has revealed the notable structural evolution along with milling time. The initial mixture of phases: Bcc-Cr, Fcc-Co along with minor contribution of Hcp-Co tend to diminish progressively with prolonged milling starting with Hcp-Co which disappeared shortly after 5&#xa0;h. Meanwhile, the disordered Bcc Cr(Co) phase appeared, became dominant and ultimately accounted for 100% of the mixture which is attributed to the affluence of the Co atoms towards the Cr lattice. The DSC thermograms of the milled Cr<sub>70</sub>Co<sub>30</sub> powder exhibits an exothermic and endothermic peak, which extend over the temperature range (100–1200) °C reflecting the structural relaxation, phase transformations, grain growth and magnetic transitions. The mechanical quantities such as H/E and H<sup>3</sup>/E<sup>2</sup> are of about 9 and 152 GPa, respectively, after 30&#xa0;h of milling.</p>

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Phase transformations, thermal stability and forming studies of the ball-milled Cr70Co30 powders

  • 期刊论文

  • 发表日期：

    2026年1月6日

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  • Achraf Djallel Eddine Sid,
  • Leila Dekhil,
  • Amina Grairia,
  • Saida Boukeffa

摘要

Nanometric Cr70Co30 powders mixture was obtained by ball milling from highly purified Cr and Co powders using a planetary ball mill under an argon atmosphere. Microstructural and structural parameters were deduced from Rietveld refinement of the XRD patterns. Thermal stability and forming of nanostructured Cr70Co30 powders were studied by differential scanning calorimetry and sintering in solid phase at a heating temperature of 950 °C. The X-ray diffraction results along with Rietveld refinement has revealed the notable structural evolution along with milling time. The initial mixture of phases: Bcc-Cr, Fcc-Co along with minor contribution of Hcp-Co tend to diminish progressively with prolonged milling starting with Hcp-Co which disappeared shortly after 5 h. Meanwhile, the disordered Bcc Cr(Co) phase appeared, became dominant and ultimately accounted for 100% of the mixture which is attributed to the affluence of the Co atoms towards the Cr lattice. The DSC thermograms of the milled Cr70Co30 powder exhibits an exothermic and endothermic peak, which extend over the temperature range (100–1200) °C reflecting the structural relaxation, phase transformations, grain growth and magnetic transitions. The mechanical quantities such as H/E and H3/E2 are of about 9 and 152 GPa, respectively, after 30 h of milling.