TY - JOUR
T1 - Phase transformation behaviour in continuously cooled Zr65Al7.5Ni10Cu17.5- xPdx (x = 0 - 17.5) glass-forming alloys and consequences for structure and property control
AU - Setyawan, A. D.
AU - Kato, H.
AU - Saida, J.
AU - Inoue, A.
N1 - Funding Information:
This work was supported by a Grant-in-Aid for Priority Areas on ‘Materials Science of Bulk Metallic Glasses’ and ‘Scientific Research B’ from the Ministry of Education, Sports, Culture, Science and Technology, Japan and Japan Science Promotion Society (JSPS), Asian Core Program.
PY - 2008/3
Y1 - 2008/3
N2 - Continuous cooling transformation (CCT) diagrams were successfully constructed for Zr65Al7.5Ni10Cu17.5-xPdx (x=0-17.5) glass-forming alloys, comparing phase-transformation features in the alloy system to composition. While a low-Pd alloy (x=5) showed a single transformation curve, corresponding to the formation of a crystalline phase on the high-temperature side of the undercooled-liquid region, for a given time-scale, a high-Pd alloy (x=17.5) revealed an additional curve, corresponding to quasicrystalline phase formation on the lower temperature side. The result provides a clue to the structural and property control on the alloy system. Glassy specimens of the same size but with different intrinsic structure, evaluated by structural relaxation during continuous heating, could be fabricated for the low-Pd alloy (x=5). Plasticity was found to increase proportionally with the relaxation enthalpy. On the other hand, the critical size for glass formation could be improved considerably from 5 to 7 mm in diameter for the high-Pd alloy (x=17.5).
AB - Continuous cooling transformation (CCT) diagrams were successfully constructed for Zr65Al7.5Ni10Cu17.5-xPdx (x=0-17.5) glass-forming alloys, comparing phase-transformation features in the alloy system to composition. While a low-Pd alloy (x=5) showed a single transformation curve, corresponding to the formation of a crystalline phase on the high-temperature side of the undercooled-liquid region, for a given time-scale, a high-Pd alloy (x=17.5) revealed an additional curve, corresponding to quasicrystalline phase formation on the lower temperature side. The result provides a clue to the structural and property control on the alloy system. Glassy specimens of the same size but with different intrinsic structure, evaluated by structural relaxation during continuous heating, could be fabricated for the low-Pd alloy (x=5). Plasticity was found to increase proportionally with the relaxation enthalpy. On the other hand, the critical size for glass formation could be improved considerably from 5 to 7 mm in diameter for the high-Pd alloy (x=17.5).
KW - Metallic glasses
KW - Phase transformation
KW - Quasicrystals
KW - Undercooling
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U2 - 10.1080/14786430801958380
DO - 10.1080/14786430801958380
M3 - Article
AN - SCOPUS:46249093093
VL - 88
SP - 1125
EP - 1136
JO - Philosophical Magazine
JF - Philosophical Magazine
SN - 1478-6435
IS - 8
ER -