POSITRON STUDIES OF THE CHEMICAL-COMPOSITION OF GUINIER-PRESTON ZONES IN AL-ZN ALLOYS

被引：11

作者：

DLUBEK, G

GERBER, W

机构：

[1] Fachbereich Physik, Pädagogischen Hochschule Halle‐ Köthen

来源：

PHYSICA STATUS SOLIDI B-BASIC RESEARCH | 1991年 / 163卷 / 01期

关键词：

D O I：

10.1002/pssb.2221630106

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

Various decomposed Al-Zn alloys are investigated by position lifetime and angular correlation technique in order to study the potential of positron method in estimating the composition of Guinier-Preston zones. From experiments the curve shape parameters, S, the core annihilation rate, lambda-c, and the number of free conduction electrons, z, derived from the zeros of the one-dimensional Fourier-transform of the angular correlation curve are estimated. The response of the various annihilation parameters to zone composition, positron affinity, and alloying effects (lattice change, charge transfer) is discussed. The number of free electrons per atom reflects most clearly the chemical composition of the GP zones.

引用

页码：83 / 89

页数：7

共 21 条

[1] RESPONSE OF POSITRONS TO CLUSTERING IN AL-ZN ALLOYS [J].

BHARATHI, A ;

CHAKRABORTY, B .

JOURNAL OF PHYSICS F-METAL PHYSICS, 1988, 18 (03) :363-375

[2] A POSITRON-ANNIHILATION STUDY OF CLUSTERING OF AG ATOMS IN A QUENCHED AL-1 ATMOSPHERIC-PERCENT AG ALLOY [J].

BHARATHI, A ;

SUNDAR, CS ;

VASUMATHI, D ;

GOPINATHAN, KP .

PHYSICA STATUS SOLIDI A-APPLIED RESEARCH, 1987, 102 (01) :139-143

[3] PRECIPITATION AND DISSOLUTION PROCESSES IN AGE-HARDENABLE AL-ALLOYS - COMPARISON OF POSITRON-ANNIHILATION AND X-RAY SMALL-ANGLE SCATTERING INVESTIGATIONS .1. AL-ZN(3 AT-PERCENT),AL-ZN(4.5 AT-PERCENT),AL-ZN(6 AT-PERCENT),AL-ZN(10 AT-PERCENT),AND AL-ZN(18 AT-PERCENT) [J].

DLUBEK, G ;

KABISCH, O ;

BRUMMER, O ;

LOFFLER, H .

PHYSICA STATUS SOLIDI A-APPLIED RESEARCH, 1979, 55 (02) :509-518

[4] STUDY OF INFLUENCE OF SHORT-RANGE ORDER, CLUSTERING AND CRYSTAL-LATTICE DEFECTS ON POSITRON-ANNIHILATION IN ALPHA AND ALPHA + BETA-BRASS [J].

DLUBEK, G ;

BRUMMER, O .

KRISTALL UND TECHNIK-CRYSTAL RESEARCH AND TECHNOLOGY, 1978, 13 (05) :577-585

[5] ESTIMATION OF THE FERMI MOMENTUM IN AL FROM THE FOURIER-TRANSFORM OF THE POSITRON-ANNIHILATION ANGULAR-CORRELATION CURVE [J].

DLUBEK, G ;

GERBER, W .

PHYSICA STATUS SOLIDI B-BASIC RESEARCH, 1990, 161 (02) :K81-K84

[6]

DLUBEK G, 1987, 4TH P INT C AG HARD, V13, P11

[7] ESTIMATION OF FERMI-SURFACE PARAMETERS FROM THE ONE-DIMENSIONAL FOURIER-TRANSFORM OF THE POSITRON-ANNIHILATION ANGULAR-CORRELATION CURVES [J].

GERBER, W ;

HOPPE, W ;

BRUMMER, O ;

DLUBEK, G .

PHYSICA STATUS SOLIDI B-BASIC RESEARCH, 1982, 112 (01) :231-235

[8] DIE ZONENBILDUNG IN ALUMINIUM ZINK-LEGIERUNGEN [J].

GEROLD, V .

PHYSICA STATUS SOLIDI, 1961, 1 (01) :37-49

[9]

Glaser U. H., 1989, Positron Annihilation, P368

[10]

Hautojarvi P., 1979, TOP CURR PHYS, V12, P1

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