Microstructural analysis of impurity segregation around β-Nb precipitates in Zr–Nb alloy using positron annihilation spectroscopy and atom probe tomography. (November 2015)

• Record Type: Journal Article
• Authors: Toyama, T.; Matsukawa, Y.; Saito, K.; Satoh, Y.; Abe, H.; Shinohara, Y.; Nagai, Y.
• Is Part Of: Scripta materialia. Volume 108(2015)
• Page Start: 156
• Page End: 159
• Publication Date: 2015-11
• Subjects: Impurity segregation -- Precipitate interface -- Positron annihilation spectroscopy -- Atom probe tomography -- Zirconium alloy; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2015.07.005
• Languages: English
• ISSNs: 1359-6462

Abstract

Graphical abstract: Fe segregation are evident at the interface between β-Nb precipitates and α-Zr matrix by atom probe tomography (APT). Defects are observed at the interface by positron annihilation spectroscopy. It is also suggested that Fe was segregated to a concentration of several tens of percent at a local region at the interface, which is approximately one order of magnitude higher than APT and difficult to observe directly even using APT. Abstract: Impurity segregation at the interface between β-Nb precipitates and α-Zr matrix in Zr-2.5 wt.%Nb alloy was investigated by complementary analysis with positron annihilation spectroscopy (PAS) and atom probe tomography (APT). Fe segregation and Fe-decorated defects were found at the interface. PAS also suggested that Fe was segregated to a concentration of several tens of percent at a local region at the interface, which is approximately one order of magnitude higher than APT and difficult to observe directly even using APT.