Structure of mechanically alloyed Ti-Al-Nb powders

Consolidation of nanocrystalline powders

“…This is expected to be the disordered version of the B2 phase reported in Ti-A1-Nb alloys [13]. In the B2 lattice, the A1 and Nb atoms occupy the cube comer positions and the Ti atoms occupy the body-centered position.…”

“…Since the X-ray atomic scattering factors of Ti and the average (AI+Nb) atom are almost equal to each other, the intensities of the superlattice reflections in this alloy are so low that they cannot be observed in the X-ray diffraction patterns. Thus, it is difficult to distinguish between the ordered and disordered forms of the B2 structure in Ti-A1-Nb alloys by the X-ray diffraction technique [13]. However, since the heavy plastic deformation introduced during mechanical alloying is expected to disorder the ordered intermetallics [15], we suspect that the phase formed in these alloys is the disordered bcc phase.…”

Mechanical alloying characteristics and thermal stability of Ti–Al–Si and Ti–Al–Si–C powders

“…Nowadays, the process has been extensively used [1][2][3][4] as an effective tool to synthesize metastable phases, such as supersaturated solid solutions, amorphous alloys and nanocrystalline materials. Among such materials, a great effort has been devoted in recent years to develop titanium-aluminum intermetallics [5][6][7][8][9], TiAl-based ternary systems [10][11][12], and composites such as TiAl/Ti 5 Si 3 .…”

Analysis of Ball‐Milled ZrAlNiCu Bulk Metallic Glass Powders

“…[4,5] However, the crystallization of amorphous alloys under ball-milling, which is considered as mechanically induced crystallization (MIC), has been observed extensively in a number of alloy systems, i.e., Al-, Fe-, Ti-and Zr-based ones. [6][7][8][9][10][11][12][13][14] In particular, a cyclic crystalline-glassy-crystalline phase transformation induced by BM has been reported in CoÀTi, ZrÀNi, ZrÀAlÀNi and ZrÀAlÀNiÀCuÀPd systems. [12][13][14][15] These previous works have shown that the crystallization process and the corresponding procedures under ball-milling are significantly different from those obtained under conventional thermal crystallization, indicating that the MIC cannot be attributed only to the local temperature rise.…”

“…[8,9] The exact mechanisms of MIC are not fully understood but have been suggested to be related to the effects -possibly combined -of pressure and mechanically induced defects. [7][8][9][10][11]16] This manuscript gives the first results of an on-going research project set up to improve the understanding of MIC in Zr-based BMGs. To this end, the crystallization behaviors of Zr 65 Al 7.5 Ni 10 Cu 17.5 (Z1) and Zr 58 Al 16 Ni 11 Cu 15 (Z2) BMGs under ball-milling and thermal cycles are here compared.…”