Sub-nanometer open volume regions in a bulk metallic glass investigated by positron annihilation

被引：99

作者：

Flores, K. M. ^{[1
]}

Sherer, E.

Bharathula, A.

Chen, H.

Jean, Y. C.

机构：

[1] Ohio State Univ, Dept Mat Sci & Engn, Columbus, OH 43201 USA

[2] Univ Missouri, Dept Chem, Kansas City, MO 64110 USA

来源：

ACTA MATERIALIA | 2007年 / 55卷 / 10期

基金：

美国国家科学基金会;

关键词：

metallic glass; free volume; plastic deformation; positron annihilation;

D O I：

10.1016/j.actamat.2007.01.040

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The size distribution of open volume regions in a Zr-based bulk metallic glass is investigated by positron annihilation lifetime spectroscopy. Three lifetime components are identified, indicating the presence of three distinct size ranges for open volume defects in the glass. The first two components compare favorably with literature values for bulk and vacancy annihilation in crystalline Zr, and are assigned to annihilation in the densely packed bulk and loosely packed flow defects within the glass. The third lifetime component corresponds to the annihilation of ortho-Positronium in a very low concentration of voids with radii 2.1-2.7 angstrom. The sizes of all three defects decrease with inhomogeneous deformation, while the concentrations of flow defects and voids increase. (C) 2007 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：3403 / 3411

页数：9

共 48 条

[1]

[Anonymous], LIQUIDS STRUCTURE PR

[2] PLASTIC-DEFORMATION IN METALLIC GLASSES [J].

ARGON, AS .

ACTA METALLURGICA, 1979, 27 (01) :47-58

[3] Chemical ordering around open-volume regions in bulk metallic glass Zr52.5Ti5Al10Cu17.9Ni14.6 [J].

Asoka-Kumar, P ;

Hartley, J ;

Howell, R ;

Sterne, PA ;

Nieh, TG .

APPLIED PHYSICS LETTERS, 2000, 77 (13) :1973-1975

[4] GEOMETRICAL APPROACH TO THE STRUCTURE OF LIQUIDS [J].

BERNAL, JD .

NATURE, 1959, 183 (4655) :141-147

[5] GEOMETRY OF THE STRUCTURE OF MONATOMIC LIQUIDS [J].

BERNAL, JD .

NATURE, 1960, 185 (4706) :68-70

[6]

Campillo JM, 1998, PHYS STATUS SOLIDI B, V206, P509, DOI 10.1002/(SICI)1521-3951(199804)206:2<509::AID-PSSB509>3.0.CO

[7]

2-J

[8] STRUCTURAL INVESTIGATION OF COLD-ROLLED METALLIC GLASSES USING POSITRON-ANNIHILATION METHODS [J].

CHEN, HS ;

CHUANG, SY .

APPLIED PHYSICS LETTERS, 1975, 27 (06) :316-317

[9] Thermal evidence of stress-induced structural disorder of a Zr55Al10Ni5Cu30 glassy alloy in the non-Newtonian region [J].

Chen, HS ;

Kato, H ;

Inoue, A ;

Saida, J ;

Nishiyama, N .

APPLIED PHYSICS LETTERS, 2001, 79 (01) :60-62

[10] MOLECULAR TRANSPORT IN LIQUIDS AND GLASSES [J].

COHEN, MH ;

TURNBULL, D .

JOURNAL OF CHEMICAL PHYSICS, 1959, 31 (05) :1164-1169

← 1 2 3 4 5 →