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Microstructure and microchemistry study of irradiation-induced precipitates in proton irradiated ZrNb alloys
- Source :
- Acta Materialia. 178:228-240
- Publication Year :
- 2019
- Publisher :
- Elsevier BV, 2019.
-
Abstract
- Proton irradiation induced Nb redistribution in Zr-xNb alloys (x = 0.4, 0.5, 1.0 wt%) has been investigated using scanning transmission electron microscopy/energy dispersive X-ray spectroscopy (STEM/EDS). Zr-xNb alloys are mainly composed of Zr matrix, native Zr–Nb–Fe phases, and β-Nb precipitates. After 2 MeV proton irradiation at 350 °C, a decrease of Nb content in native precipitates, as well as irradiation-induced precipitation of Nb-rich platelets (135 ± 69 nm long and 27 ± 12 nm wide) were found. Nb-rich platelets and Zr matrix form the Burgers orientation relationship, [ 1 1 ¯ 1 ]//[ 2 1 ¯ 1 ¯ 0 ] and (011)//(0002). The platelets were found to be mostly coherent with the matrix with a few dislocations near the ends of the precipitate. The coherent strain field has been measured in the matrix and platelets by the 4D-STEM technique. The growth of Nb-rich platelets is mainly driven by coherency and dislocation-induced strain fields. Irradiation may both enhance the diffusion and induce segregation of interstitial Nb to the ends of the irradiation induced platelets, further facilitating their growth.
- Subjects :
- 010302 applied physics
Materials science
Polymers and Plastics
Precipitation (chemistry)
Metals and Alloys
02 engineering and technology
021001 nanoscience & nanotechnology
Microstructure
01 natural sciences
Electronic, Optical and Magnetic Materials
Crystallography
0103 physical sciences
Scanning transmission electron microscopy
Ceramics and Composites
Redistribution (chemistry)
Irradiation
Matrix form
0210 nano-technology
Spectroscopy
Subjects
Details
- ISSN :
- 13596454
- Volume :
- 178
- Database :
- OpenAIRE
- Journal :
- Acta Materialia
- Accession number :
- edsair.doi...........2415fda62583553c3ad855257c8e92a7