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Neutron diffraction investigation of vacuum sintering in a binary Fe/Mn powder mixture

Journal Article


Abstract


  • This study investigated the sublimation of Mn and microstructural evolution of binary Fe/Mn compacts sintered at various temperatures in a vacuum. A high sintering temperature or a lengthy holding time promotes powder densification. Due to sublimation of Mn, the weight loss of the compacts mainly occurs during the isothermal holding stage of the sintering process; it increases significantly from 1.5 wt.% for sintering at 1000 °C to 8.6 wt.% at 1200 °C. For the first time, the phase evolution in the binary elemental compacts was clarified using in situ neutron diffraction. The γ-austenite phase emerges during temperature ramping to 536 °C, while β-Mn and α-Fe disappear at 774 °C and 881 °C. The neutron diffraction also revealed that single phase γ-austenite forms in the Fe-Mn compacts if the temperature is ≥ 881 °C.

Publication Date


  • 2018

Citation


  • Xu, Z., Liss, K. D., Hodgson, M. A., Chang, K., Chen, G., Hayat, M. D., . . . Cao, P. (2018). Neutron diffraction investigation of vacuum sintering in a binary Fe/Mn powder mixture. Journal of Alloys and Compounds, 768, 563-571. doi:10.1016/j.jallcom.2018.07.262

Scopus Eid


  • 2-s2.0-85050678821

Start Page


  • 563

End Page


  • 571

Volume


  • 768

Abstract


  • This study investigated the sublimation of Mn and microstructural evolution of binary Fe/Mn compacts sintered at various temperatures in a vacuum. A high sintering temperature or a lengthy holding time promotes powder densification. Due to sublimation of Mn, the weight loss of the compacts mainly occurs during the isothermal holding stage of the sintering process; it increases significantly from 1.5 wt.% for sintering at 1000 °C to 8.6 wt.% at 1200 °C. For the first time, the phase evolution in the binary elemental compacts was clarified using in situ neutron diffraction. The γ-austenite phase emerges during temperature ramping to 536 °C, while β-Mn and α-Fe disappear at 774 °C and 881 °C. The neutron diffraction also revealed that single phase γ-austenite forms in the Fe-Mn compacts if the temperature is ≥ 881 °C.

Publication Date


  • 2018

Citation


  • Xu, Z., Liss, K. D., Hodgson, M. A., Chang, K., Chen, G., Hayat, M. D., . . . Cao, P. (2018). Neutron diffraction investigation of vacuum sintering in a binary Fe/Mn powder mixture. Journal of Alloys and Compounds, 768, 563-571. doi:10.1016/j.jallcom.2018.07.262

Scopus Eid


  • 2-s2.0-85050678821

Start Page


  • 563

End Page


  • 571

Volume


  • 768