<abstract xmlns="http://www.w3.org/1999/xhtml">The aim of this work was to investigate the effects of moderate vacuum conditions (10 Pa, 1 × 103 Pa and 2 × 104 Pa) on glass forming ability, thermal stability and aging behavior of Co42Cu1Fe20Ta5:5B26:5Si5 amorphous samples in terms of size and distribution of crystalline precipitates. The thinnest parts (300 μm) of the wedge-shaped samples were amorphous for all vacuum conditions, and they had similar compositional, structural and thermal characteristics. However, they represented different microstructural features after heat treatments at 950 K and 1100 K. The same phases precipitated in all samples but the amount and the size of the precipitates increased as the pressure was raised to the normal atmospheric value. The differences in the glass forming ability and the microstructure due to aging are considered to originate from lower thermal characteristics, such as relaxation and reduced glass temperature as well as γ parameter, resulting from the poor vacuum pressure used in the production process. The differences in the microstructures and hardness values caused by heat treatments have been observed.</abstract>

The aim of this work was to investigate the effects of moderate vacuum conditions (10 Pa, 1 × 103 Pa and 2 × 104 Pa) on glass forming ability, thermal stability and aging behavior of Co42Cu1Fe20Ta5:5B26:5Si5 amorphous samples in terms of size and distribution of crystalline precipitates. The thinnest parts (300 μm) of the wedge-shaped samples were amorphous for all vacuum conditions, and they had similar compositional, structural and thermal characteristics. However, they represented different microstructural features after heat treatments at 950 K and 1100 K. The same phases precipitated in all samples but the amount and the size of the precipitates increased as the pressure was raised to the normal atmospheric value. The differences in the glass forming ability and the microstructure due to aging are considered to originate from lower thermal characteristics, such as relaxation and reduced glass temperature as well as γ parameter, resulting from the poor vacuum pressure used in the production process. The differences in the microstructures and hardness values caused by heat treatments have been observed.

Effect of vacuum conditions on stability and crystallization of cobalt based amorphous alloy

Department of Materials Science and Engineering

Materials Science-Poland

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

The aim of this work was to investigate the effects of moderate vacuum conditions (10 Pa, 1 × 103 Pa and 2 × 104 Pa) on glass forming ability, thermal...

Effect of vacuum conditions on stability and crystallization of cobalt based amorphous alloy

Published Online: May 08, 2020

Page range: 181 - 188

Received: Jan 06, 2019

Accepted: Aug 07, 2019

DOI: https://doi.org/10.2478/msp-2020-0003

Keywords
metallic glass, glass forming ability, crystallization behavior, thermal stability, casting atmosphere

© 2020 Ziya Ozgur Yazici, published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Effect of vacuum conditions on stability and crystallization of cobalt based amorphous alloy

Published Online: May 08, 2020

Page range: 181 - 188

Received: Jan 06, 2019

Accepted: Aug 07, 2019

DOI: https://doi.org/10.2478/msp-2020-0003

Keywordsmetallic glass, glass forming ability, crystallization behavior, thermal stability, casting atmosphere

© 2020 Ziya Ozgur Yazici, published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Keywords
metallic glass, glass forming ability, crystallization behavior, thermal stability, casting atmosphere