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Materials Data on Mn3AlC by Materials Project

AlCMn3 is (Cubic) Perovskite structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Mn is bonded in a linear geometry to four equivalent Al and two equivalent C atoms. All Mn–Al bond lengths are 2.69 Å. Both Mn–C bond lengths are 1.90 Å. Al is bonded to twelve equivalent Mn atoms to form AlMn12 cuboctahedra that share corners with twelve equivalent AlMn12 cuboctahedra, faces with six equivalent AlMn12 cuboctahedra, and faces with eight equivalent CMn6 octahedra. C is bonded to six equivalent Mn atoms to form CMn6 octahedra that share corners with six equivalent CMn6 octahedra and faces with eight equivalent AlMn12 cuboctahedra. The corner-sharing octahedral tilt angles are 0°.

36 MATERIALS SCIENCE↗

Iron-base superalloys - A phase analysis of the multicomponent system (Fe-Mn-Cr-Mo-Nb-Al-Si-C)

In the course of studies on the iron-rich multicomponent system Fe-Mn-Cr-Mo-Nb-Al-Si-C, work was concentrated on pertinent quinary and six-component combinations namely Fe-Mn-Al-Si-C, Fe-Cr-Al-Si-C and Fe-Mn-Cr-Al-Si-C which had been elaborated at 65, 72, and 80 wt pct Fe. Manganese acts as a strong stabilizer for the cementite carbide. Chromium seems to stabilize the iron aluminide Fe2Al5 which forms in a considerable amount within an alloy of nominal composition Fe(65)Mn(15)Cr(12)Al(5)Si(2)C(1) (percent by weight). Although the Mn3AlC carbide is, like Fe3AlC, a perovskite carbide, manganese does not appear to favor the formation of the perovskite carbide. Because of the relatively low sintering temperature (700 C), for al large portion of the samples equilibria conditions are not always reached.

Gupta, H.↗