Mechanical alloying by ball milling of Ti and Mg elemental powders: Operation condition considerations

The effect of ball milling treatment on structure and porosity of maize starch granule

“…The milled starch granules at 2 h showed the loss of alternate growth rings and the occurrence of the desired cavities and tunnels in the inner of distorted starch granules, however, the distorted granules still remained their intact granule periphery. It was indicated that ball milling treatment facilitated the transition from heterogeneous matrix to homogeneous matrix in starch granules and induced development of central cavities caused by the melting of crystalline structure (Kuo & Lai, 2007;Phasha, Maweja, & Babst, 2010). These phenomena were similar with the studies on the cassava starch with heating at intermediate water contents (Garcia, Colonna, Bouchet, & Gallant, 1997) and the barley starch with heat treatment (Li et al, 2004).…”

Microstructure and crystal structure of an equimolar Mg–Ti alloy processed by Simoloyer high-energy ball mill

“…The X-ray spectra of the powders milled at 800 rpm and 400 rpm for different times are shown in Figure 4 and Figure 5, synthesized from previous work [13].…”

“…Previous work by Phasha et al [13] showed that the milling speed and the starting average particle size ratio between Mg and Ti affected both the mechanism and the kinetics of solid solution during mechanical alloying. The authors observed that the mechanical alloying process was slowed and solid solution of Ti in Mg was difficult to achieve when the starting particle size of the soft Mg was 8 times larger than that of the hard Ti.…”

Desarrollo de aleaciones ß Ti-Nb-Mo mediante pulvimetalurgia para aplicaciones biomédicas

“…No obstante, el contacto entre la superficie limpia de las partículas de polvo metálico con las superficies de las herramientas de molienda conduce a una pronunciada soldadura en frío entre estas, lo que puede disminuir considerablemente el rendimiento del proceso (Grosjean & Roué, 2006). En el estudio de Pasha y col. con polvos de Ti y Mg indican que el rendimiento del polvo después de la mezcla mecánica disminuyó dramáticamente al aumentar el tiempo de molienda (Phasha, Maweja, & Babst, 2010). Esto suele suceder cuando el fenómeno de soldadura en frío domina el proceso.…”