Relaxation behavior of Zr-Cu-Al ternary bulk glassy alloy studied by using positron annihilation techniques

Akito Ishii; Shinya Mineno; Akihiro Iwase; Yoshihiko Yokoyama; Toyohiko J. Konno; Fuminobu Hori

doi:10.4028/www.scientific.net/MSF.654-656.1070

Relaxation behavior of Zr-Cu-Al ternary bulk glassy alloy studied by using positron annihilation techniques

Akito Ishii, Shinya Mineno, Akihiro Iwase, Yoshihiko Yokoyama, Toyohiko J. Konno, Fuminobu Hori

Materials Processing and Characterization Division

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

1 Citation (Scopus)

Abstract

Zr-based bulk glassy (BG) alloys show high tensile strength and a high Charpy impact value. In this study, the free volume changes for the hypoeutectic Zr₆₀Cu₃₀Al₁₀ BG alloy during isothermal annealing below glass transition temperature (T_g) have been investigated by positron annihilation lifetime and coincidence Doppler broadening (CDB) measurements. The positron lifetime of hypoeutectic and eutectic BG alloys is almost the same, although the atomic volume ratio, estimated by the density for the eutectic BG alloy is different from that for the hypoeutectic BG alloy. The CDB spectra show a marked difference between eutectic and hypoeutectic BG alloys; that is, the spectrum of the hypoeutectic BG alloy is closes to that of Zr metal than that of the eutectic BG alloy. This result exhibits that the elemental fraction of Zr atoms around free volume in hypoeutectic BG alloy is greater than that in eutectic BG alloy. The CDB ratio profiles for the hypoeutectic BG alloy during annealing shows no appreciable change. The same trend was observed in the eutectic BG alloy.

Original language	English
Title of host publication	PRICM7
Publisher	Trans Tech Publications Ltd
Pages	1070-1073
Number of pages	4
ISBN (Print)	0878492550, 9780878492558
DOIs	https://doi.org/10.4028/www.scientific.net/MSF.654-656.1070
Publication status	Published - 2010 Jan 1
Event	7th Pacific Rim International Conference on Advanced Materials and Processing, PRICM-7 - Cairns, QLD, Australia Duration: 2010 Aug 2 → 2010 Aug 6

Publication series

Name	Materials Science Forum
Volume	654-656
ISSN (Print)	0255-5476
ISSN (Electronic)	1662-9752

Other

Other	7th Pacific Rim International Conference on Advanced Materials and Processing, PRICM-7
Country	Australia
City	Cairns, QLD
Period	10/8/2 → 10/8/6

Keywords

Bulk glassy alloy
Positron annihilation techniques
Structural relaxation

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

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Relaxation behavior of Zr-Cu-Al ternary bulk glassy alloy studied by using positron annihilation techniques. / Ishii, Akito; Mineno, Shinya; Iwase, Akihiro; Yokoyama, Yoshihiko; Konno, Toyohiko J.; Hori, Fuminobu.

PRICM7. Trans Tech Publications Ltd, 2010. p. 1070-1073 (Materials Science Forum; Vol. 654-656).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Ishii, A, Mineno, S, Iwase, A, Yokoyama, Y, Konno, TJ & Hori, F 2010, Relaxation behavior of Zr-Cu-Al ternary bulk glassy alloy studied by using positron annihilation techniques. in PRICM7. Materials Science Forum, vol. 654-656, Trans Tech Publications Ltd, pp. 1070-1073, 7th Pacific Rim International Conference on Advanced Materials and Processing, PRICM-7, Cairns, QLD, Australia, 10/8/2. https://doi.org/10.4028/www.scientific.net/MSF.654-656.1070

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title = "Relaxation behavior of Zr-Cu-Al ternary bulk glassy alloy studied by using positron annihilation techniques",

abstract = "Zr-based bulk glassy (BG) alloys show high tensile strength and a high Charpy impact value. In this study, the free volume changes for the hypoeutectic Zr60Cu30Al10 BG alloy during isothermal annealing below glass transition temperature (Tg) have been investigated by positron annihilation lifetime and coincidence Doppler broadening (CDB) measurements. The positron lifetime of hypoeutectic and eutectic BG alloys is almost the same, although the atomic volume ratio, estimated by the density for the eutectic BG alloy is different from that for the hypoeutectic BG alloy. The CDB spectra show a marked difference between eutectic and hypoeutectic BG alloys; that is, the spectrum of the hypoeutectic BG alloy is closes to that of Zr metal than that of the eutectic BG alloy. This result exhibits that the elemental fraction of Zr atoms around free volume in hypoeutectic BG alloy is greater than that in eutectic BG alloy. The CDB ratio profiles for the hypoeutectic BG alloy during annealing shows no appreciable change. The same trend was observed in the eutectic BG alloy.",

keywords = "Bulk glassy alloy, Positron annihilation techniques, Structural relaxation",

author = "Akito Ishii and Shinya Mineno and Akihiro Iwase and Yoshihiko Yokoyama and Konno, {Toyohiko J.} and Fuminobu Hori",

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AU - Yokoyama, Yoshihiko

AU - Konno, Toyohiko J.

AU - Hori, Fuminobu

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N2 - Zr-based bulk glassy (BG) alloys show high tensile strength and a high Charpy impact value. In this study, the free volume changes for the hypoeutectic Zr60Cu30Al10 BG alloy during isothermal annealing below glass transition temperature (Tg) have been investigated by positron annihilation lifetime and coincidence Doppler broadening (CDB) measurements. The positron lifetime of hypoeutectic and eutectic BG alloys is almost the same, although the atomic volume ratio, estimated by the density for the eutectic BG alloy is different from that for the hypoeutectic BG alloy. The CDB spectra show a marked difference between eutectic and hypoeutectic BG alloys; that is, the spectrum of the hypoeutectic BG alloy is closes to that of Zr metal than that of the eutectic BG alloy. This result exhibits that the elemental fraction of Zr atoms around free volume in hypoeutectic BG alloy is greater than that in eutectic BG alloy. The CDB ratio profiles for the hypoeutectic BG alloy during annealing shows no appreciable change. The same trend was observed in the eutectic BG alloy.

AB - Zr-based bulk glassy (BG) alloys show high tensile strength and a high Charpy impact value. In this study, the free volume changes for the hypoeutectic Zr60Cu30Al10 BG alloy during isothermal annealing below glass transition temperature (Tg) have been investigated by positron annihilation lifetime and coincidence Doppler broadening (CDB) measurements. The positron lifetime of hypoeutectic and eutectic BG alloys is almost the same, although the atomic volume ratio, estimated by the density for the eutectic BG alloy is different from that for the hypoeutectic BG alloy. The CDB spectra show a marked difference between eutectic and hypoeutectic BG alloys; that is, the spectrum of the hypoeutectic BG alloy is closes to that of Zr metal than that of the eutectic BG alloy. This result exhibits that the elemental fraction of Zr atoms around free volume in hypoeutectic BG alloy is greater than that in eutectic BG alloy. The CDB ratio profiles for the hypoeutectic BG alloy during annealing shows no appreciable change. The same trend was observed in the eutectic BG alloy.

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