Mechanically alloyed Mo–Si–B alloys with a continuous α-Mo matrix and improved mechanical properties

Similarities and Differences in Mechanical Alloying Processes of V-Si-B and Mo-Si-B Powders

“…Milling durations for periods longer than 50 h lead to a decrease of the powder particle size. In the present experiments at 200 rpm the growth of the particles is observed during the first 5 h of milling which is in good agreement with previous studies on V-Si [38] and Mo-Si(-B) [19] powders. A lower kinetic energy, generated by using a rotational speed of 150 rpm, extends the duration of welding processes (correlating with rising particle sizes) up to a maximum of 20 h in the case of V-9Si-13B powders milled with stainless steel tools.…”

“…However, this element has a very small solubility [39,40] and a less pronounced effect on the lattice parameters due to its comparatively small atomic radius. Here it is assumed that Si substitutes the V or Mo sites, respectively, and B occupies the interstitial sites as it was also observed in a previous study during MA of Mo-Si, Mo-B and Mo-Si-B powders [19]. In general, all observations in the present study follow this trend, but the development of these characteristics is significantly dependent on the milling parameters.…”

“…Only small peaks of Si remain after that short milling time which is in good agreement with the results of our previous experiments on the MA of V-Si, Mo-Si and Mo-Si-B powders with Si concentrations in the range between 9 and 15 at. % [19,38]. Further indicators for the dissolution of Si in the V lattice are the peak shifting (marked with the red line in Figure 1a) as well as an elimination of the clear separation of the Kα and Kβ peak due to the varying parameters of the unit cell by the formation of a V(Si,B) solid solution.…”

“…% silicon and 5-12 at. % boron aimed in the formation of silicides with an outstanding creep phases [11,16,19]. A variation of the rotational speed of the planetary ball mill and the type of grinding materials enables the variation of the impact energy and, therefore, helps to optimize this process.…”

Combustion features in the Mo–Si–B system. Part 1. Mechanism and kinetics

“…В работах [5][6][7] изучены свойства сплавов в тройной системе Mo-Si-B при варьиро вании концентраций в интервалах 9-12 ат.% Si и 8-20 ат.% B. Данные материалы помимо высоко температурной прочности и стойкости к окисле нию обладают высокой вязкостью разрушения. Значительная часть работ посвящена исследова нию сплавов на основе Т 2 фазы (Mo 5 SiB 2 ) [8][9][10][11][12][13], которая обладает высоким потенциалом в обла сти ультравысокотемпературных применений.…”