Development of a novel fcc structure for an amorphous-nanocrystalline Ti-33Nb-4Mn (at.%) ternary alloy

摘要

AbstractIn this work, a novel amorphous-nanocrystalline titanium?niobium?manganese solid solution ternary alloy with a Ti-33Nb-4Mn (at.%) nominal composition was developed by a High-Energy Mechanical Alloying. Nb and Mn were added to the elemental Ti as a β-phase (bcc) stabilizer and an amorphization promoter, respectively. The system evolved from the elemental Ti, Nb and Mn raw materials to a body centred cubic (bcc) TiNbMn alloy and, finally, to the formation of an original and stable face centred cubic (fcc) nanocrystalline TiNbMn alloy, not reported until now, at short milling time (20h). This alloy remains invariant until 120h. In turn, the partial amorphization of the system occurs and increases until at intermediate milling time (80h). The production of both originalfccand the amorphous TiNbMn alloy may be beneficial for reducing the Young's modulus and improving the mechanical strength pursued for the Ti alloy. The optimal milling time respect to the amorphization, nanocrystalline size and Fe mount from milling media was 60h and 80h (TiNbMn60handTiNbMn80h), with >50wt% of an amorphous phase and a crystalline domain size of approximately 5nm.Graphical AbstractDisplay OmittedHighlights?An amorphized-nanocrystalline TiNbMn alloy was obtained via mechanical alloying.?The obtained TiNbMn ternary alloy evolved with the mechanical alloying time.?At lower milling time, two nanocrystalline phases (bcc and fcc) were developed.?At higher milling time, a stable amorphous-nanocrystalline fcc-alloy was obtained.?The fcc structure has not been previously published for Ti based alloys.]]>