Positron annihilation study on hafnium metals given various treatments

Journal Article · Sun Aug 01 00:00:00 EDT 1993 · Scripta Metallurgica et Materialia; (United States)

DOI:https://doi.org/10.1016/0956-716X(93)90508-P· OSTI ID:6354102

Min, Duck Ki; Kang, Myung Soo ^[1]; Yoon, Young Ku ^[2]

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1. Korea Atomic Energy Research Inst., Taejon (Korea, Republic of)
2. Korea Advanced Inst. of Science and Tech., Taejon (Korea, Republic of)

The positron annihilation technique that enables measurements of positron lifetime, two-photon angular correlation and Doppler broadening due to annihilation radiation has been established for studies of the electronic configuration and defect properties in solids. In metals, positrons can be trapped at vacancies and their agglomerates as well as at dislocations, but not at interstitials. Because of these interactions, the positron annihilation method can be applied to studies of the behavior of dislocations during annealing of plastically deformed metals. Furthermore, it is possible by measurements of annihilation characteristics to identify defects such as vacancies, dislocations and vacancy-clusters, and to determine spatial dimensions of defects. In this work, positron annihilation measurements for annealed, cold worked, annealed and then quenched, and cold worked and then cathodically hydrogen charged hafnium specimens were made to obtain information on (a) positron annihilation characteristics of hafnium metal, (b) role of vacancy-type defects on hydrogen charging, (c) defects produced during hydrogen charging and (d) recovery of lattice defects in hafnium and effects of hydrogen on defects recovery upon annealing.

• OSTI ID: 6354102
• Journal Information: Scripta Metallurgica et Materialia; (United States), Vol. 29:3; ISSN 0956-716X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
HAFNIUM
CRYSTAL DEFECTS
ANNEALING
ANNIHILATION
COLD WORKING
DISLOCATIONS
EXPERIMENTAL DATA
HYDROGEN ADDITIONS
POSITRONS
VACANCIES
ANTILEPTONS
ANTIMATTER
ANTIPARTICLES
BASIC INTERACTIONS
CRYSTAL STRUCTURE
DATA
ELECTROMAGNETIC INTERACTIONS
ELEMENTARY PARTICLES
ELEMENTS
FABRICATION
FERMIONS
HEAT TREATMENTS
INFORMATION
INTERACTIONS
LEPTONS
LINE DEFECTS
MATERIALS WORKING
MATTER
METALS
NUMERICAL DATA
PARTICLE INTERACTIONS
POINT DEFECTS
TRANSITION ELEMENTS
360102* - Metals & Alloys- Structure & Phase Studies
665100 - Nuclear Techniques in Condensed Matter Physics - (1992-)