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Elastic Properties and Microstructure of Metallic Glasses Pd39Ni10Cu30P21 Studied by Microacoustical Technique

Published online by Cambridge University Press:  11 February 2011

Vadim M. Levin ,
Julia S. Petronyuk ,
Limin Wang ,
Jiankai Hu  and
Qianlin Zhang
Vadim M. Levin
Affiliation:
Lab. of Acoustic Microscopy, Institute of Biochemical Physics, Russian Academy of Sciences, 4 Kosygin st., 119991, Moscow, Russia
Julia S. Petronyuk
Affiliation:
Lab. of Acoustic Microscopy, Institute of Biochemical Physics, Russian Academy of Sciences, 4 Kosygin st., 119991, Moscow, Russia
Limin Wang
Affiliation:
Institute of Physics & Center for Condensed Matter Physics, Chinese Academy of Sciences, P.O.Box 603, 100080, Beijing, People's Republic of China
Jiankai Hu
Affiliation:
Lab. of Ultrasonic NDT, Dept. of Electr. Engineering, Univ. of Science & Technology of China, 230026, Hefei, Anhui, China
Qianlin Zhang
Affiliation:
Dept. of Electronic Engineering, Graduate School, Chinese Academy of Sciences, 100039, Beijing, China
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Abstract

The elastic properties of Pd39Ni10Cu10P21 bulk metallic glass (BMG) have been analysed using measurements of sound velocities. Different states of the Pd39Ni10Cu10P21 system (glassy state, supercooled liquid (SCL) and polycrystalline state) were obtained by annealing the samples near the glass transition and crystallization onset temperature. The microacoustical technique has been applied to measure local values of longitudinal and transverse elastic wave velocities and their distribution over a specimen. Finally sound velocities VL and VT, density ρ, bulk K and shear G elastic moduli were measured for different states. The values of ρ, VL and K decrease as temperature increases and the transition from glass to SCL takes place. In the crystalline state ultrasonic measurements were performed by the standard pulse ultrasonic technique with low-frequency flat transducer because of high ultrasonic attenuation in this state. Acoustic images (C-scans) demonstrate coarse-grained microstructure in this state. This is assumed to be characteristic of the microstructure obtained by crystallizing BMG.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 754: Symposium CC – Supercooled Liquids, Glass Transition and Bulk Metallic Glasses , 2002 , CC11.18
Copyright
Copyright © Materials Research Society 2003

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References

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