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<p>In the present work a novel approach has been proposed to fabricate the Fe-20Mn-10Al-0.7C (fmac) alloy through powder metallurgy route. The novel high-temperature powder forging (HTPF) processing method was used for the fabrication of proposed alloy. Solid Works and Ansys software were used for finalization of the design of mold used in HTPF and to optimize processing parameters. The fabricated sample was aged and quenched at three different temperatures 252, 480 and 870&#xa0;°C. The in-depth analysis of microstructure and phase formation was studied using advance characterization techniques, e.g., synchrotron x-ray diffraction (SXRD) and electron back scattered diffraction (EBSD). The microstructure of the composed alloy having the austenite-based matrix with an average grain size of around 3&#xa0;µm. This study further investigates the evolution of <i>β</i>-Manganese (<i>β</i>-Mn), k-Carbides, Aluminum carbide (Al<sub>4</sub>C<sub>3</sub>) and Fe<sub>2</sub>Al<sub>5</sub> phases. The k-Carbides displayed early formation at 250&#xa0;°C near the grain boundaries. Also, due to the application of high pressure, the hexaferrum (<InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\varepsilon\)</EquationSource> <EquationSource Format="MATHML"><math> <mi>ε</mi> </math></EquationSource> </InlineEquation>) phase was formed during HTPF in as fabricated alloy, confirmed by EBSD. The findings reveal that the sample aged and quenched at 480&#xa0;°C exhibits significant growth in hardness of around 680 ± 28&#xa0;Hv (79.94% higher from base alloy) due to the presence of brittle intermetallic phase like Fe<sub>2</sub>Al<sub>5</sub>. Additionally, the fabricated alloy was tested through Methylthiazolyldiphenyl-tetrazolium bromide (MTT) assay, and it demonstrated excellent cell viability at concentrations up to 500&#xa0;µg/mL. Remarkable cell viability of 94% was observed for 5&#xa0;μg/mL concentration. This behavior highlights the strong potential of fmac alloy for biomedical application-based research. The sintering mechanism was proposed and different stages of sintering involved during HTPF was explained.</p>

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Analyzing Phase Evolution through Synchrotron x-ray Diffraction in Fe-20Mn-10Al-0.7C Alloy Fabricated via High-Temperature Powder Forging

  • 期刊论文

  • 发表日期：

    2025年12月22日

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  • Ravi Kumar Singh,
  • Deepak kumar,
  • Divya Pareek,
  • Nikhil Kumar

摘要

In the present work a novel approach has been proposed to fabricate the Fe-20Mn-10Al-0.7C (fmac) alloy through powder metallurgy route. The novel high-temperature powder forging (HTPF) processing method was used for the fabrication of proposed alloy. Solid Works and Ansys software were used for finalization of the design of mold used in HTPF and to optimize processing parameters. The fabricated sample was aged and quenched at three different temperatures 252, 480 and 870 °C. The in-depth analysis of microstructure and phase formation was studied using advance characterization techniques, e.g., synchrotron x-ray diffraction (SXRD) and electron back scattered diffraction (EBSD). The microstructure of the composed alloy having the austenite-based matrix with an average grain size of around 3 µm. This study further investigates the evolution of β-Manganese (β-Mn), k-Carbides, Aluminum carbide (Al4C3) and Fe2Al5 phases. The k-Carbides displayed early formation at 250 °C near the grain boundaries. Also, due to the application of high pressure, the hexaferrum ( \(\varepsilon\) ε ) phase was formed during HTPF in as fabricated alloy, confirmed by EBSD. The findings reveal that the sample aged and quenched at 480 °C exhibits significant growth in hardness of around 680 ± 28 Hv (79.94% higher from base alloy) due to the presence of brittle intermetallic phase like Fe2Al5. Additionally, the fabricated alloy was tested through Methylthiazolyldiphenyl-tetrazolium bromide (MTT) assay, and it demonstrated excellent cell viability at concentrations up to 500 µg/mL. Remarkable cell viability of 94% was observed for 5 μg/mL concentration. This behavior highlights the strong potential of fmac alloy for biomedical application-based research. The sintering mechanism was proposed and different stages of sintering involved during HTPF was explained.