TY - GEN
T1 - Bulk amorphous alloys: Preparation and properties of (Mg0.98Al0.02)x(Cu0.75Y0.25)100-x
AU - Eldrup, Morten Mostgaard
AU - Pedersen, Allan Schrøder
AU - Ohnuma, M.
AU - Pryds, Nini
AU - Linderoth, Søren
PY - 2000
Y1 - 2000
N2 - New bulk amorphous quaternary alloys of the composition (Mg1-xAlx)(60)Cu30Y10 (x = 0 - 0.17) were recently reported by the authors and preliminary results of the influence of Al content on the ability to form a bulk amorphous phase were presented. In the present note we extend this work to look for the influence of the Mg-Al content on the glass forming ability by studying a range of compositions, (Mg0.98Al0.02)(x)(Cu0.75Y0.25)(100-x) for x = 60 - 80 at.%. As previously, the alloys were prepared by a relatively simple technique, i.e. rapid cooling of the melt in a wedge-shaped copper mould. This method provides a range of cooling rates within a single ingot during the solidification that link the slowly and rapidly cooled microstructure for each alloy composition. Hence, the maximum thickness of the amorphous part of the cast material will be a measure of the glass forming ability (GFA) of the particular alloy. X-ray diffraction (XRD) and Differential Scanning Calorimetry (DSC) have been used to investigate the structure and the various structural transitions in the alloys. One observation is that the GFA decreases with increasing content of (Mg0.98Al0.02)(x). For x > similar to 75 at.% no amorphous phase is formed. Based on these measurements a phase diagram was constructed.
AB - New bulk amorphous quaternary alloys of the composition (Mg1-xAlx)(60)Cu30Y10 (x = 0 - 0.17) were recently reported by the authors and preliminary results of the influence of Al content on the ability to form a bulk amorphous phase were presented. In the present note we extend this work to look for the influence of the Mg-Al content on the glass forming ability by studying a range of compositions, (Mg0.98Al0.02)(x)(Cu0.75Y0.25)(100-x) for x = 60 - 80 at.%. As previously, the alloys were prepared by a relatively simple technique, i.e. rapid cooling of the melt in a wedge-shaped copper mould. This method provides a range of cooling rates within a single ingot during the solidification that link the slowly and rapidly cooled microstructure for each alloy composition. Hence, the maximum thickness of the amorphous part of the cast material will be a measure of the glass forming ability (GFA) of the particular alloy. X-ray diffraction (XRD) and Differential Scanning Calorimetry (DSC) have been used to investigate the structure and the various structural transitions in the alloys. One observation is that the GFA decreases with increasing content of (Mg0.98Al0.02)(x). For x > similar to 75 at.% no amorphous phase is formed. Based on these measurements a phase diagram was constructed.
KW - Industrielle materialer
KW - bulk amorphous alloy
KW - glass forming ability
KW - Mg-based alloys
KW - quaternary alloys
U2 - 10.4028/www.scientific.net/MSF.343-346.123
DO - 10.4028/www.scientific.net/MSF.343-346.123
M3 - Article in proceedings
SN - 0-87849-858-3
T3 - Materials Science Forum
SP - 123
EP - 128
BT - Metastable, Mechanically Alloyed and Nanocrystalline Materials
PB - Trans Tech Publications Ltd.
T2 - International Symposium on Metastable, Mechanically Alloyed and Nanocrystalline Materials
Y2 - 30 August 1999 through 3 September 1999
ER -