Investigation of the Ti-rich Ti-Fe-Mn System (1st Report). On the TiMn&lt;SUB&gt;2&lt;/SUB&gt;-Mn Range of the Binary Ti-Mn System

陽太郎, 村上; 敏男, 圓城

doi:10.2320/jinstmet1952.22.5_261

Cited by 9 publications

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“…Both compounds TiMn B3 and TiMn B4 form through peritectic reactions at 1245 1C and 1225 1C, respectively (Table 2). All these temperatures are close to those reported in the literature 10,[38][39][40][41][42][43][44][45][46][47] (see Fig. 1a and b).…”

Section: Resultssupporting

confidence: 89%

“…1a. Although these results confirm the essential features of the Ti-Mn phase diagram as hitherto reported, [10][11][12][13][14][38][39][40][41][42][43][44][45][46][47][48] there are significant changes and improvements. Our diffusion couple Ti + TiMn 2 , annealed at 900 1C, revealed three phases in the region around 50 at% Mn: aTiMn 1Àx (44.0 to 46.6 at% Mn; henceforth called TiMn 1Àx ), TiMn (at 49.3 to 50.2 at% Mn) and bTiMn 1+x (54.6 to 56.3 at% Mn; hereforth called TiMn 1+x ).…”

Section: Resultssupporting

confidence: 82%

“…for TiTi As the first step in the thermodynamic optimisation of the Ti-Mn system, the DFT calculated ground state energies of real and hypothetical structures of the Laves phase Ti 1+x Mn 2Àx were included and taken as fixed values. As the second step, the thermodynamic parameters of the Laves phase and of the liquid and the bcc phases were adjusted to fit to experimental information, [10][11][12][13][14][39][40][41][42][43][44][45][46][47][48] preferentially to the experimental data from this work. Subsequently the data for the phases in the Ti-rich part of the phase diagram were optimised.…”

Section: Resultsmentioning

confidence: 99%

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The Ti–Mn system revisited: experimental investigation and thermodynamic modelling

Khan

Brož

Premović

et al. 2016

Phys. Chem. Chem. Phys.

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As the Ti-Mn phase diagram is part of numerous ternary and higher order systems of technological importance, the present paper defines phase relations which have been experimentally established throughout this work from 800 °C to the melting range based on Differential Thermal Analyses (DTA), X-ray powder diffraction, metallography and Electron Probe Micro Analysis (EPMA) techniques on ∼50 alloys, which were prepared by arc melting or high frequency melting under high purity argon starting from freshly cleaned metal ingots. Novel compounds were identified and reaction isotherms were redefined accordingly. In the Ti-rich region a novel compound TiMn was detected, sandwiched between the known phases: TiMn1-x (∼45 at% Mn) and TiMn1+x (∼55 at% Mn). In the Mn-rich region the hitherto unknown crystal structure of TiMn∼3 was solved from X-ray single crystal diffraction data and found to be of a unique structure type Ti6(Ti1-xMnx)6Mn25 (x = 0.462; space group Pbam (#55); a = 0.79081(3) nm, b = 2.58557(9) nm, c = 0.47931(2) nm), which consists of two consecutive layers of the hexagonal MgZn2-type Laves phase (TiMn2) and a combined layer of alternate structure blocks of MgZn2 type and Zr4Al3 type. Whereas TiMn can be considered as a line compound (solubility range <∼1 at%), the homogeneity regions of the Ti-Mn compounds are significant (determined by EPMA): TiMn1-x (44.0 to 46.6 at% Mn), TiMn1+x (54.6 to 56.3 at% Mn), Ti1+xMn2-x (MgZn2-type, 59 to 69 at% Mn at 1000 °C: -0.08 < x < 0.23), TiMn∼3 (unique type; 74 to 76.5 at% Mn) and TiMn∼4 (R-phase: Ti8(TixMn1-x)6Mn39, 80 to 84 at% Ti). Supported by ab initio calculations of the ground state energy for the Laves phase, the new experimental results enabled thermodynamic modelling of the entire Ti-Mn phase diagram providing a complete and novel set of thermodynamic data thus providing a sound basis for future thermodynamic predictions of higher order Ti-Mn-X-Y systems.

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Section: Resultssupporting

confidence: 89%