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The glass forming ability (GFA) of metallic glasses (MGs) is quantified by the critical cooling rate ( R   C ). Despite its key role in MG research, experimental challenges have limited measured  R   C  to a minute fraction of known glass formers. We present a combinatorial approach to directly measure  R   C  for large compositional ranges. This is realized through the use of compositionally-graded alloy libraries, which were photo-thermally heated by scanning laser spike annealing of an absorbing layer, then melted and cooled at various rates. Coupled with X-ray diffraction mapping, GFA is determined from direct  R   C  measurements. We exemplify this technique for the Au-Cu-Si system, where we identify Au 56 Cu 27 Si 17  as the alloy with the highest GFA. In general, this method enables measurements of  R   C  over large compositional areas, which is powerful for materials discovery and, when correlating with chemistry and other properties, for a deeper understanding of MG formation.

Determination of critical cooling rates in metallic glass forming alloy libraries through laser spike annealing