In-situ time resolved X-ray diffraction study of the formation of the nanocrystalline NbAl3 phase by mechanically activated self-propagating high-temperature synthesis reaction

Reactive synthesis and characterization of titanium aluminides produced from elemental powder mixtures

“…It seems that as the aluminum melt reacts with titanium particles, some pores are left behind at the sites originally occupied by aluminum. Similar behavior has been attributed to the formation of pores during the synthesis of various aluminides from powder mixtures [31][32][33][34][35][36]. This is also in agreement with studies suggesting that the diffusion of aluminum atoms into titanium particles is the predominant mechanism governing the formation of titanium aluminides [21,22,[25][26][27].…”

In-situ neutron diffraction of titanium silicide, Ti5Si3, during self-propagating high-temperature synthesis (SHS)

“…The effect this has on synthesis kinetics and reaction pathways remains largely unknown due to limited opportunity for in situ analysis, but has been proposed to produce a highly metastable environment. Diffraction based techniques have been used previously for in situ study of SHS reaction sequences for many compounds [9][10][11][12][13][14][15][16][17][18][19], though this has typically focused on using X-rays (either Cu K a or synchrotron radiation) to analyse propagating mode reactions. In situ neutron diffraction has several advantages for resolving the SHS reaction mechanisms during simultaneous mode synthesis, especially in systems where possibly irreversible reactions occur over a broad range of stoichiometries and therefore require an equally wide 2q range.…”

Ignition and reaction mechanism of Co–Al and Nb–Al intermetallic compounds prepared by combustion synthesis

“…Transition metals aluminides exhibit fairly high melting points, good resistance to corrosion and oxidation at high temperatures, high mechanical strength, together with good chemical and thermal expansion compatibility with Al 2 O 3 reinforcing fibers, that enable the fabrication of light weight and high creep strength composites [1][2][3]. Ni-Al is the most investigated system.…”

“…pose according to a peritectic reaction at 2060 and 1940 • C, respectively. NbAl 3 has a potential application as turbine blade material in aircraft engines and stationary gas turbine [15], thanks to its relatively low density (4.54 g/cm 3 ) and very good resistance to oxidation processes. Nb 3 Al shows superconducting properties and has broad potential for alloying with transition metals as V, providing an opportunity for significant improvements of mechanical properties of Nb 3 Al-based alloys [16].…”