Published March 1, 2016 | Version v1
Journal article Metadata-only

Defects evolution in nanoporous Au(Pt) during dealloying

Creators

  • 1. Corrosion and Protection Center, Key Laboratory for Environmental Fracture (MOE), University of Science and Technology Beijing, Beijing 100083 (China)
  • 2. School of Physics and Technology, Hubei Nuclear Solid Physics Key Laboratory, Wuhan University, Wuhan 430072 (China)
  • 3. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016 (China)
  • 4. Department of Mechanical Engineering, University of South Florida, Tampa, FL 33620 (United States)

Description

The vacancies and small voids evolution within the ligaments of nanoporous (np) Au(Pt) in dealloying processes were investigated by positron annihilation spectroscopy. The np Au(Pt) samples with 5–8 nm ligaments were prepared by electrochemical dealloying of (Au0.95Pt0.05)25Ag75 ingots. The positron lifetime of as-prepared np Au(Pt) consists of the two main components. One is assigned to the positron annihilation at vacancies within the nano-ligaments and the other to the positron annihilation in the enclosed voids in the ligaments. Vacancy concentration increased significantly when silver atoms leached out further from the np structure, which supports the vacancy-mediated lattice diffusion mechanism of porosity evolution. - Graphical abstract: Vacancy concentration increased when silver atoms leached out further from the np structure during the dealloying process.

Availability note (English)

Available from http://dx.doi.org/10.1016/j.scriptamat.2015.10.006

Additional details

Identifiers

DOI
10.1016/j.scriptamat.2015.10.006;
PII
S1359-6462(15)30006-3;

Publishing Information

Journal Title
Scripta Materialia
Journal Volume
113
Journal Page Range
p. 68-70
ISSN
1359-6462
CODEN
SCMAF7

INIS

Country of Publication
United Kingdom
Country of Input or Organization
International Atomic Energy Agency (IAEA)
INIS RN
48012689
Subject category
S36: MATERIALS SCIENCE;
Descriptors DEI
ANNIHILATION; CONCENTRATION RATIO; DIFFUSION; ELECTROCHEMISTRY; GOLD; GOLD ALLOYS; LEACHING; LIFETIME; LIGAMENTS; PLATINUM; PLATINUM ALLOYS; POROSITY; POSITRONS; SILVER; SILVER BASE ALLOYS; VACANCIES; VOIDS
Descriptors DEC
ALLOYS; ANIMAL TISSUES; ANTILEPTONS; ANTIMATTER; ANTIPARTICLES; BODY; CHEMISTRY; CONNECTIVE TISSUE; CRYSTAL DEFECTS; CRYSTAL STRUCTURE; DIMENSIONLESS NUMBERS; DISSOLUTION; ELEMENTARY PARTICLES; ELEMENTS; FERMIONS; INTERACTIONS; LEPTONS; MATTER; METALS; PARTICLE INTERACTIONS; PLATINUM METAL ALLOYS; PLATINUM METALS; POINT DEFECTS; SEPARATION PROCESSES; SILVER ALLOYS; TRANSITION ELEMENT ALLOYS; TRANSITION ELEMENTS

Optional Information

Copyright
Copyright (c) 2015 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.