TY - JOUR

T1 - Golden Mean analysis of bulk metallic glasses with critical diameter over half-inch for their mole fractions of compositions

AU - Takeuchi, A.

AU - Yavari, A. R.

AU - Inoue, A.

PY - 2009/9

Y1 - 2009/9

N2 - Eighteen bulk metallic glasses (BMGs) with critical diameters over ∼15 mm in Pd-, Zr-, Mg-, Y-, La-, Pt- and Ca-based multicomponent alloys were analyzed for their mole fractions of compositions with Golden Mean (φ{symbol} ∼ 1.618). The results proved that the 18 BMG compositions are describable with mφ{symbol}-n or mΦ-n where Φ-n is φ{symbol}-(n+1) plus φ{symbol}-(n-1) and m and n are positive integers. The maximum difference in fractions between the analyzed and experimental compositions was 0.038. The irrational nature of φ{symbol} makes the compositions of the 18 BMGs different from those of the stoichiometric intermetallic compounds and near eutectic compositions, leading to the high glass-forming ability. The possible prototypes of the 18 BMGs have the ability to form critically-percolated local atomic arrangements for both Metal-Metal and Metal-Metalloid types of BMGs. Golden Mean analysis provides a new alloy design for fractions of alloying elements owing to its irrationality.

AB - Eighteen bulk metallic glasses (BMGs) with critical diameters over ∼15 mm in Pd-, Zr-, Mg-, Y-, La-, Pt- and Ca-based multicomponent alloys were analyzed for their mole fractions of compositions with Golden Mean (φ{symbol} ∼ 1.618). The results proved that the 18 BMG compositions are describable with mφ{symbol}-n or mΦ-n where Φ-n is φ{symbol}-(n+1) plus φ{symbol}-(n-1) and m and n are positive integers. The maximum difference in fractions between the analyzed and experimental compositions was 0.038. The irrational nature of φ{symbol} makes the compositions of the 18 BMGs different from those of the stoichiometric intermetallic compounds and near eutectic compositions, leading to the high glass-forming ability. The possible prototypes of the 18 BMGs have the ability to form critically-percolated local atomic arrangements for both Metal-Metal and Metal-Metalloid types of BMGs. Golden Mean analysis provides a new alloy design for fractions of alloying elements owing to its irrationality.

KW - B. Alloy design

KW - B. Glasses, metallic

KW - E. Phase diagram, prediction

KW - E. Phase stability, prediction

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U2 - 10.1016/j.intermet.2009.02.006

DO - 10.1016/j.intermet.2009.02.006

M3 - Article

AN - SCOPUS:67349150669

VL - 17

SP - 696

EP - 703

JO - Intermetallics

JF - Intermetallics

SN - 0966-9795

IS - 9

ER -