TY - JOUR
T1 - Nanometer-scale solute clustering in aluminum-nickel-ytterbium metallic glasses
AU - Isheim, Dieter
AU - Seidman, David N.
AU - Perepezko, John H.
AU - Olson, Gregory B.
N1 - Funding Information:
The authors wish to thank Dr R. Wu for preparing and precharacterizing the investigated alloy. This research was supported by the Department of Defense through the DARPA initiative under contract number DAAH01-01-C-R009 (D.I., D.N.S., and G.B.O.) and DAAD19-01-1-0486 (J.H.P.).
PY - 2003/7/25
Y1 - 2003/7/25
N2 - The transformation sequence of melt-spun Al-5.2at.% Ni-6.8at.% Yb is characterized by X-ray diffraction, differential scanning calorimetry (DSC), and atom-probe field-ion microscopy. An isochronal DSC thermogram detects three major exothermic transformation steps, with onset temperatures of 180, 292, and 327°C, respectively. Atom-probe analyses reveal the evolution of compositional inhomogeneities on an atomic scale. In addition to Ni-clusters present in the as-quenched alloy, Ni-Yb co-clusters form during isochronal heating to 188°C. Al-rich precipitates are detected after heating to 250°C, with the Ni and Ni-Yb clusters still present, constituting possible precursors of intermetallic phases formed during advanced transformation stages.
AB - The transformation sequence of melt-spun Al-5.2at.% Ni-6.8at.% Yb is characterized by X-ray diffraction, differential scanning calorimetry (DSC), and atom-probe field-ion microscopy. An isochronal DSC thermogram detects three major exothermic transformation steps, with onset temperatures of 180, 292, and 327°C, respectively. Atom-probe analyses reveal the evolution of compositional inhomogeneities on an atomic scale. In addition to Ni-clusters present in the as-quenched alloy, Ni-Yb co-clusters form during isochronal heating to 188°C. Al-rich precipitates are detected after heating to 250°C, with the Ni and Ni-Yb clusters still present, constituting possible precursors of intermetallic phases formed during advanced transformation stages.
KW - Aluminum-nickel-ytterbium alloy
KW - Amorphous and partially crystallized material
KW - Clustering
UR - http://www.scopus.com/inward/record.url?scp=0038722806&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0038722806&partnerID=8YFLogxK
U2 - 10.1016/S0921-5093(02)00674-3
DO - 10.1016/S0921-5093(02)00674-3
M3 - Article
AN - SCOPUS:0038722806
VL - 353
SP - 99
EP - 104
JO - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
JF - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
SN - 0921-5093
IS - 1-2
ER -