Study of Interaction Mechanism between Positrons and Ag Clusters in Dilute Al–Ag Alloys at Low Temperature

The microstructural evolution of dilute Al–Ag alloys in its early aging stage and at low temperatures ranging from 15 K to 300 K was studied by the combined use of Positron annihilation lifetime spectroscopy (PALS), high resolution transmission electron microscopy (HRTEM), and positron annihilation...

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Autores principales: Liu, Xiaoshuang, Zhang, Peng, Wang, Baoyi, Cao, Xingzhong, Jin, Shuoxue, Yu, Runsheng
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2021
Materias:
Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8002228/
https://www.ncbi.nlm.nih.gov/pubmed/33809744
http://dx.doi.org/10.3390/ma14061451
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author Liu, Xiaoshuang
Zhang, Peng
Wang, Baoyi
Cao, Xingzhong
Jin, Shuoxue
Yu, Runsheng
author_facet Liu, Xiaoshuang
Zhang, Peng
Wang, Baoyi
Cao, Xingzhong
Jin, Shuoxue
Yu, Runsheng
author_sort Liu, Xiaoshuang
collection PubMed
description The microstructural evolution of dilute Al–Ag alloys in its early aging stage and at low temperatures ranging from 15 K to 300 K was studied by the combined use of Positron annihilation lifetime spectroscopy (PALS), high resolution transmission electron microscopy (HRTEM), and positron annihilation Coincidence Doppler broadening (CDB) techniques. It is shown that at low temperatures below 200 K, an Ag–vacancy complex is formed in the quenched alloy, and above 200 K, it decomposes into Ag clusters and monovacancies. Experimental and calculation results indicate that Ag clusters in Al–Ag alloys can act as shallow trapping sites, and the positron trapping rate is considerably enhanced by a decreasing measurement temperature.
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spelling pubmed-80022282021-03-28 Study of Interaction Mechanism between Positrons and Ag Clusters in Dilute Al–Ag Alloys at Low Temperature Liu, Xiaoshuang Zhang, Peng Wang, Baoyi Cao, Xingzhong Jin, Shuoxue Yu, Runsheng Materials (Basel) Article The microstructural evolution of dilute Al–Ag alloys in its early aging stage and at low temperatures ranging from 15 K to 300 K was studied by the combined use of Positron annihilation lifetime spectroscopy (PALS), high resolution transmission electron microscopy (HRTEM), and positron annihilation Coincidence Doppler broadening (CDB) techniques. It is shown that at low temperatures below 200 K, an Ag–vacancy complex is formed in the quenched alloy, and above 200 K, it decomposes into Ag clusters and monovacancies. Experimental and calculation results indicate that Ag clusters in Al–Ag alloys can act as shallow trapping sites, and the positron trapping rate is considerably enhanced by a decreasing measurement temperature. MDPI 2021-03-16 /pmc/articles/PMC8002228/ /pubmed/33809744 http://dx.doi.org/10.3390/ma14061451 Text en © 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Liu, Xiaoshuang
Zhang, Peng
Wang, Baoyi
Cao, Xingzhong
Jin, Shuoxue
Yu, Runsheng
Study of Interaction Mechanism between Positrons and Ag Clusters in Dilute Al–Ag Alloys at Low Temperature
title Study of Interaction Mechanism between Positrons and Ag Clusters in Dilute Al–Ag Alloys at Low Temperature
title_full Study of Interaction Mechanism between Positrons and Ag Clusters in Dilute Al–Ag Alloys at Low Temperature
title_fullStr Study of Interaction Mechanism between Positrons and Ag Clusters in Dilute Al–Ag Alloys at Low Temperature
title_full_unstemmed Study of Interaction Mechanism between Positrons and Ag Clusters in Dilute Al–Ag Alloys at Low Temperature
title_short Study of Interaction Mechanism between Positrons and Ag Clusters in Dilute Al–Ag Alloys at Low Temperature
title_sort study of interaction mechanism between positrons and ag clusters in dilute al–ag alloys at low temperature
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8002228/
https://www.ncbi.nlm.nih.gov/pubmed/33809744
http://dx.doi.org/10.3390/ma14061451
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