Synthesis of Al–Y–Ni–Co composites by mechanical alloying and consecutive spark-plasma sintering

Effect of consolidation pressure on phase evolution during sintering of mechanically alloyed Al86Ni8Y6 amorphous powders via spark plasma sintering

“…Preliminary work by Povstugar et al on SPS consolidation of mechanically alloyed Al 85 Y 8 Ni 5 Co 2 revealed presence of Al nanograins along with large size ( $ 20 μm) porosities in the partially amorphous matrix [18]. Li et al reported formation of a nanocrystalline Al 5 Co 2 phase in SPS consolidated gas atomized Al 86 Ni 6 Y 4.5 Co 2 La 1.5 glassy powders attributed to "abnormal crystallization" resulting from high pressure sintering in SPS [12].…”

In situ reaction synthesis of Ti–TiB composites containing high volume fraction of TiB by spark plasma sintering process

“…Spark plasma sintering (SPS), also known as the field-assisted sintering technique (FAST), is a comparatively novel sintering process that allows the compacted powders to be sintered at low temperatures, with short heating, holding, and cooling time compared to that used in conventional sintering technique [1][2][3]. In SPS process, raw powders in a graphite die are pressed uniaxially and a high-density pulsed direct current is applied, both the joule heating and the plastic deformation effects contribute to densification of the powders.…”

Crystallization Behavior and Control of Amorphous Alloys

“…This opens up the possibility of preparing truly bulk samples through powder consolidation in supercooled liquid region. In the Zr-, Cu-, Fe-and Ni-based alloy systems, some successful consolidation of amorphous powders with wide supercooled liquid region has been achieved by warm extrusion, spark plasma sintering and equal channel angular pressing (ECAP) (Choi et al, 2007;Ishihará et al, 2002;Itoi et al, 2001;Karaman et al, 2004;Kawamura et al, 1997;Kim et al, 2004;Kim et al, 2009;Lee et al, 2003;Mear et al, 2009;Robertson et al, 2003;Senkov et al, 2004;Senkov et al, 2005;Sordelet et al, 2002;Zhang et al, 2006b;Zhang, et al, 2007a). The consolidated samples show almost the same thermal properties, mechanical properties, and/or soft magnetic properties as those of the BMGs prepared by direct melt casting from molted The data of the onset temperature of crystallization (T x ) and the glass transition temperature (T g ) at the heating rate of 0.67 K s -1 are also shown.…”