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Volume 14
Issue 6
10.3390/ma14061451
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Article

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

by
Xiaoshuang Liu
1,2,
Peng Zhang
1,
Baoyi Wang
1,2,
Xingzhong Cao
1,2,
Shuoxue Jin
1 and
Runsheng Yu
1,*
1
Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
2
School of Nuclear Science and Technology, Chinese Academy of Sciences, Beijing 100039, China
*
Author to whom correspondence should be addressed.
Materials 2021, 14(6), 1451; https://doi.org/10.3390/ma14061451
Submission received: 9 February 2021 / Revised: 9 March 2021 / Accepted: 12 March 2021 / Published: 16 March 2021
(This article belongs to the Special Issue Metallurgical Process Simulation and Optimization)
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Abstract

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.
Keywords: Al–Ag alloys; Ag clusters; positron annihilation; monovacancies; shallow trapping Al–Ag alloys; Ag clusters; positron annihilation; monovacancies; shallow trapping

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MDPI and ACS Style

Liu, X.; Zhang, P.; Wang, B.; Cao, X.; Jin, S.; Yu, R. Study of Interaction Mechanism between Positrons and Ag Clusters in Dilute Al–Ag Alloys at Low Temperature. Materials 2021, 14, 1451. https://doi.org/10.3390/ma14061451

AMA Style

Liu X, Zhang P, Wang B, Cao X, Jin S, Yu R. Study of Interaction Mechanism between Positrons and Ag Clusters in Dilute Al–Ag Alloys at Low Temperature. Materials. 2021; 14(6):1451. https://doi.org/10.3390/ma14061451

Chicago/Turabian Style

Liu, Xiaoshuang, Peng Zhang, Baoyi Wang, Xingzhong Cao, Shuoxue Jin, and Runsheng Yu. 2021. "Study of Interaction Mechanism between Positrons and Ag Clusters in Dilute Al–Ag Alloys at Low Temperature" Materials 14, no. 6: 1451. https://doi.org/10.3390/ma14061451

APA Style

Liu, X., Zhang, P., Wang, B., Cao, X., Jin, S., & Yu, R. (2021). Study of Interaction Mechanism between Positrons and Ag Clusters in Dilute Al–Ag Alloys at Low Temperature. Materials, 14(6), 1451. https://doi.org/10.3390/ma14061451

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