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Dependence of Modulus and Hardness on the Annealing Conditions of Pt57.5Cu14.7Ni5.3P22.5 Bulk Metallic Glass

Published online by Cambridge University Press:  17 January 2019

Zheng Chen ,
Amit Datye Open the ORCID record for Amit Datye [Opens in a new window] ,
P. Aidan Brooks ,
Madison Sprole ,
Jittisa Ketkaew ,
Sungwoo Sohn ,
Jan Schroers  and
Udo D. Schwarz
Zheng Chen
Affiliation:
Department of Mechanical Engineering and Materials Science, Yale University, New Haven, CT06520, U.S.A.
Amit Datye*
Affiliation:
Department of Mechanical Engineering and Materials Science, Yale University, New Haven, CT06520, U.S.A.
P. Aidan Brooks
Affiliation:
Department of Mechanical Engineering and Materials Science, Yale University, New Haven, CT06520, U.S.A.
Madison Sprole
Affiliation:
Department of Mechanical Engineering and Materials Science, Yale University, New Haven, CT06520, U.S.A.
Jittisa Ketkaew
Affiliation:
Department of Mechanical Engineering and Materials Science, Yale University, New Haven, CT06520, U.S.A.
Sungwoo Sohn
Affiliation:
Department of Mechanical Engineering and Materials Science, Yale University, New Haven, CT06520, U.S.A.
Jan Schroers
Affiliation:
Department of Mechanical Engineering and Materials Science, Yale University, New Haven, CT06520, U.S.A.
Udo D. Schwarz
Affiliation:
Department of Mechanical Engineering and Materials Science, Yale University, New Haven, CT06520, U.S.A.
*
*(Email: amit.datye@yale.edu)
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Abstract

The mechanical properties of metallic glasses are often tuned by annealing, which influences these properties by adjusting the relaxation and/or crystallization status of the glasses. Here, we studied the hardness and modulus of Pt57.5Cu14.7Ni5.3P22.5 bulk metallic glass annealed at different temperatures by nanoindentation, where the annealing gives the material different fictive temperatures and fractions of crystallization. It is found that both reducing the fictive temperature of a fully amorphous sample and increasing the degree of crystallization in a partially crystallized sample increase hardness and modulus. Combining the two approaches, elevated hardness and modulus values are found for composite materials containing both crystalline and amorphous phases when they are compared to chemically identical alloys featuring similar percentages of crystalline and amorphous phases that have been prepared by annealing at higher temperatures. Our findings indicate that the mechanical properties of the platinum-based alloys can be customized by processing them with targeted heat treatments.

Keywords

glassnano-indentationcrystallizationcalorimetry
Type
Articles
Information
MRS Advances , Volume 4 , Issue 2: Characterization, Mechanical Properties and Structure-Property Relationships , 2019 , pp. 73 - 79
Copyright
Copyright © Materials Research Society 2019 

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References

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