Primary Crystallization of Al-Based Metallic Glasses

Studies on the formability of Al-based metallic glasses/nanocomposites based on isochronal DSC analysis

“…The first crystallization event can be attributed to the precipitation of fcc-Al, the only phase up to 560 K, which is in well accordance with other Al-TM-RE alloys [22][23][24][25]. With the same highly asymmetric shape of the primary transformation as in other Al-based amorphous alloys, the primary crystallization onsets of the above two alloys, especially for Al 86 Si 0.5 Ni 4.06 Co 2.94 Y 6 Sc 0.5 , are relatively sharp with an initial heat flow followed by a gradual return to baseline, which implies the initially fast precipitation of nanoscale fcc-Al and the chemical homogenization later on [26,27].…”

Study of non-isothermal primary crystallization kinetics of Al84Ni12Zr1Pr3 amorphous alloy

“…As we know, compositions suited for the achievement of such microstructure are mostly based on Al-transition metal-rare earth (Al-TM-Re) system. Crystallization behaviors of various Al-Y-Ni, Al-Y-Ni-Co Al-Ni-Nd, Al-Fe-Ni-Nd and Al-Ni-La alloys have been studied at definite compositions and formation of the fcc-Al was observed at the primary stage [9][10][11][12][13][14][15]. In other case, the fcc-Al and other compounds were coexistence in the first stage crystallization in the Al-Ni-Ce alloys with Ce > 4 at.% [16].…”

Comparative study of the effect of cold rolling on the structure of Al–RE–Ni–Co (RE = rare-earth metals) amorphous and glassy alloys

“…The formation of nanoscale a-Al precipitates at the primary stage of crystallization is quite common for Al-based amorphous alloys and glass-formers, for example, one can enumerate Al-Y-Ni, Al-Y-Ni-Co [8][9][10][11], Al-Fe-Y [12], Al-Sm [12], Al-Ni-Nd [13] Al-Fe-Nd [14,15] and Al-Fe-Ni-Nd [15] alloys.…”