Precious metal amorphous AgAuSi: Alloy design by swapping gold for silver
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In: Materials and Design, Vol. 232.2023, No. August, 112099, 17.06.2023.
Research output: Contribution to journal › Article › Research › peer-review
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TY - JOUR
T1 - Precious metal amorphous AgAuSi
T2 - Alloy design by swapping gold for silver
AU - Weniger, Lisa-Marie
AU - Gammer, Christoph
AU - Niewczas, Marek
AU - Cordill, Megan J.
AU - Spieckermann, Florian
AU - Djemia, Philippe
AU - Faurie, Damien
AU - Li, Chen-Hui
AU - Lassnig, Alice
AU - Terziyska, Velislava
AU - Mitterer, Christian
AU - Eckert, Jürgen
AU - Glushko, Oleksandr
N1 - Publisher Copyright: © 2023 The Author(s)
PY - 2023/6/17
Y1 - 2023/6/17
N2 - To expand the basis for property-oriented material design, complex relationships between chemistry, atomistic structure, and properties of sputter-deposited AgxAu85-xSi15 alloys are investigated using versatile experimental methods. According to differential scanning calorimetry and X-ray diffraction data, the alloys are amorphous within a wide compositional range of 20 ≤ x ≤ 60 at%. However, high-resolution transmission electron microscopy revealed noticeable amounts of crystallites in limiting compositions with x = 20 at% and x = 60 at%. Glass transition and crystallization temperatures grow with increasing Ag content, while room-temperature resistivity and temperature coefficient of resistance are shown to be highly sensitive to the amount of crystalline phase. Neither the existence of nanocrystallites nor the substitution of Ag by Au affected significantly the mechanical properties. All compositions exhibit similar nanoindentation hardness of about 4.3 GPa, Young’s modulus of about 55 GPa, and macroscopic elastic limit of about 2%. The unique combination of high hardness, high elastic strain but low Young’s modulus together with the expected chemical inertness inherited from noble metals makes this alloy family suitable for biomedical applications in form of coatings or in jewelry if an economic bulk production route will be developed.
AB - To expand the basis for property-oriented material design, complex relationships between chemistry, atomistic structure, and properties of sputter-deposited AgxAu85-xSi15 alloys are investigated using versatile experimental methods. According to differential scanning calorimetry and X-ray diffraction data, the alloys are amorphous within a wide compositional range of 20 ≤ x ≤ 60 at%. However, high-resolution transmission electron microscopy revealed noticeable amounts of crystallites in limiting compositions with x = 20 at% and x = 60 at%. Glass transition and crystallization temperatures grow with increasing Ag content, while room-temperature resistivity and temperature coefficient of resistance are shown to be highly sensitive to the amount of crystalline phase. Neither the existence of nanocrystallites nor the substitution of Ag by Au affected significantly the mechanical properties. All compositions exhibit similar nanoindentation hardness of about 4.3 GPa, Young’s modulus of about 55 GPa, and macroscopic elastic limit of about 2%. The unique combination of high hardness, high elastic strain but low Young’s modulus together with the expected chemical inertness inherited from noble metals makes this alloy family suitable for biomedical applications in form of coatings or in jewelry if an economic bulk production route will be developed.
UR - https://pureadmin.unileoben.ac.at/portal/en/publications/precious-metal-amorphous-agausi(81ba56c3-ad07-4f94-ad63-856d3ec910db).html
U2 - 10.1016/j.matdes.2023.112099
DO - 10.1016/j.matdes.2023.112099
M3 - Article
VL - 232.2023
JO - Materials and Design
JF - Materials and Design
SN - 0264-1275
IS - August
M1 - 112099
ER -
