A new mechanism for void-cascade interaction from nondestructive depth-resolved atomic-scale measurements of ion irradiation–induced defects in Fe | Zendy

Sahil Agarwal | Zendy; Maciej Oskar Liedke | Zendy; A. C. L. Jones | Zendy; E. Reed | Zendy; Aaron A. Kohnert | Zendy; Blas P. Uberuaga | Zendy; Yongqiang Wang | Zendy; J. Cooper | Zendy; Djamel Kaoumi | Zendy; Nan Li | Zendy; R. Auguste | Zendy; Peter Hosemann | Zendy; Laurent Capolungo | Zendy; Danny J. Edwards | Zendy; Maik Butterling | Zendy; Eric Hirschmann | Zendy; A. Wagner | Zendy; F. A. Selim | Zendy

Open Access

A new mechanism for void-cascade interaction from nondestructive depth-resolved atomic-scale measurements of ion irradiation–induced defects in Fe

Author(s) -

Sahil Agarwal,

Maciej Oskar Liedke,

A. C. L. Jones,

E. Reed,

Aaron A. Kohnert,

Blas P. Uberuaga,

Yongqiang Wang,

J. Cooper,

Djamel Kaoumi,

Nan Li,

R. Auguste,

Peter Hosemann,

Laurent Capolungo,

Danny J. Edwards,

Maik Butterling,

Eric Hirschmann,

A. Wagner,

F. A. Selim

Publication year - 2020

Publication title -

science advances

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 5.928

H-Index - 146

ISSN - 2375-2548

DOI - 10.1126/sciadv.aba8437

Subject(s) - vacancy defect , irradiation , void (composites) , materials science , positron annihilation spectroscopy , ion , transmission electron microscopy , microstructure , molecular physics , atomic units , cascade , doppler broadening , atomic physics , porosity , electron , positron , positron annihilation , chemistry , spectral line , nanotechnology , crystallography , nuclear physics , physics , composite material , organic chemistry , chromatography , quantum mechanics , astronomy

The nondestructive investigation of single vacancies and vacancy clusters in ion-irradiated samples requires a depth-resolved probe with atomic sensitivity to defects. The recent development of short-pulsed positron beams provides such a probe. Here, we combine depth-resolved Doppler broadening and positron annihilation lifetime spectroscopies to identify vacancy clusters in ion-irradiated Fe and measure their density as a function of depth. Despite large concentrations of dislocations and voids in the pristine samples, positron annihilation measurements uncovered the structure of vacancy clusters and the change in their size and density with irradiation dose. When combined with transmission electron microscopy measurements, the study demonstrates an association between the increase in the density of small vacancy clusters with irradiation and a remarkable reduction in the size of large voids. This, previously unknown, mechanism for the interaction of cascade damage with voids in ion-irradiated materials is a consequence of the high porosity of the initial microstructure.

The content you want is available to Zendy users.

Already have an account? Click here to sign in.

Having issues? You can contact us here

Accelerating Research