Phase fields in rapidly solidified MnTi and MnAlTi alloys studied by X-ray diffraction

While rapid solidification causes little modification of phase fields in Mn_x Ti_1–x alloys forx < 30at%, alloys richer in manganese present metastable phases. A structure intermediate between crystalline and quasi-crystalline phases is observed in the range 0.3 <x < 0.45. Aluminium addition is found to stabilize the C14 phase down to manganese contents as low as 35 at % and Mn₃₅ (AlTi)₆₅ is found to be single-phased C14. The ternary alloy's C14 phase field emerges due to aluminium substitution for manganese at low manganese contents.