Electron radiation damage in H.C.P. metals—I. The determination of the threshold displacement energy in Zn, Cd, Mg and Ti

Karim, Amna; Whitehead, M. E.; Loretto, M. H.; Smallman, R.E.

doi:10.1016/0001-6160(78)90048-2

Cited by 28 publications

(3 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Magnesium also has the same crystal structure and c/a ratio as that of zirconium; therefore, magnesium can be used as a suitable model system and analogue to zirconium. Magnesium also provides the luxury to perform in situ electron irradiation experiments with in a commonly available 200 keV electron microscope due to its low displacement energy (9 eV) [3,4] as compared to zirconium (25 eV) [5]. Most of the previous work on magnesium involves the investigation of microstructure after quenching to understand the formation and growth of vacancy loops [6,7].…”

Section: Introductionmentioning

confidence: 99%

Microstructure evolution during electron and ion irradiation in commercial purity magnesium

Khan¹,

Yao²,

Daymond³

2014

Philosophical Magazine

View full text Add to dashboard Cite

Microstructure evolution during in situ electron irradiation at room temperature within the transmission electron microscope has been studied on commercial purity magnesium. Magnesium foils of purity 99.8% were examined for comparative studies of defect structure formed by 200 keV electrons and 1 MeV krypton ions. Transmission electron microscopy has been used to quantify the type and nature of the microstructural changes taking place during irradiation. Hexagonal-shaped faulted c-component dislocation loops with Burgers vector of 1=6h2 0 2 3i are formed by electron irradiation. Formation of inner un-faulted loops also takes place inside the faulted loops. Analysis shows that all the faulted c-component dislocation loops are interstitial in nature and growth rate of these loops is proportional to the irradiation time. Dislocation loops with Burgers vector 1=3h1 1 2 0i also form but most of these loops shrink and disappear during subsequent electron irradiation. In some of the foils, only the pre-existing dislocations in the microstructure were observed to transform into vacancy type 1=3h1 1 2 0i loops and helical configurations and no other irradiation damage appeared. Ion irradiation for a dose up to 0.1 dpa produced dislocation loops with Burgers vector of 1=3h1 1 2 0i and these loops were mixed vacancy and interstitial in character.

show abstract

Section: Introductionmentioning

confidence: 99%

Microstructure evolution during electron and ion irradiation in commercial purity magnesium

Khan¹,

Yao²,

Daymond³

2014

Philosophical Magazine

View full text Add to dashboard Cite

show abstract

“…the threshold electron-beam energy (E 0 ) depends on the displacement energy of atoms (E d ) in the samples[62,[64][65][66][67]. The threshold energies (E 0 ) of different elements, such as Al, Cu, Mg, and Zn in Al alloys, have been estimated, as presented in Supplementary Materials.In the present work, the observations of GPII zones and η' and η 2 precipitates were carried out for a duration of time using a Tecnai-F20 Schottky FEG 200 kV HRTEM with a range of beam currents (I 0 ), (0.5 nA < I 0 < 2.5 nA).…”

mentioning

confidence: 99%

Transmission electron microscopy investigation of separated nucleation and in-situ nucleation in AA7050 aluminium alloy

et al. 2018

View full text Add to dashboard Cite

“…Very few direct measurements 7 , 9 – 12 and some estimation from experimental data 4 , 13 – 15 of displacement thresholds are available at present. The literature data for the threshold energies of Ti displacement and of metal and non-metal atoms in compounds similar to titanium monoxide are given in Table 2 .…”

Section: Resultsmentioning

confidence: 99%

In situ disordering of monoclinic titanium monoxide Ti5O5 studied by transmission electron microscope TEM

Rempel

Renterghem

Валеева

et al. 2017

Sci Rep

View full text Add to dashboard Cite

The superlattice and domain structures exhibited by ordered titanium monoxide Ti5O5 are disrupted by low energy electron beam irradiation. The effect is attributed to the disordering of the oxygen and titanium sublattices. This disordering is caused by the displacement of both oxygen and titanium atoms by the incident electrons and results in a phase transformation of the monoclinic phase Ti5O5 into cubic B1 titanium monoxide. In order to determine the energies required for the displacement of titanium or oxygen atoms, i.e. threshold displacement energies, a systematic study of the disappearance of superstructure reflections with increasing electron energy and electron bombardment dose has been performed in situ in a transmission electron microscope (TEM). An incident electron energy threshold between 120 and 140 keV has been observed. This threshold can be ascribed to the displacements of titanium atoms with 4 as well as with 5 oxygen atoms as nearest neighbors. The displacement threshold energy of titanium atoms in Ti5O5 corresponding with the observed incident electron threshold energy lies between 6.0 and 7.5 eV. This surprisingly low value can be explained by the presence of either one or two vacant oxygen lattice sites in the nearest neighbors of all titanium atoms.

show abstract

Electron radiation damage in H.C.P. metals—I. The determination of the threshold displacement energy in Zn, Cd, Mg and Ti

Cited by 28 publications

References 17 publications

Microstructure evolution during electron and ion irradiation in commercial purity magnesium

Microstructure evolution during electron and ion irradiation in commercial purity magnesium

Transmission electron microscopy investigation of separated nucleation and in-situ nucleation in AA7050 aluminium alloy

In situ disordering of monoclinic titanium monoxide Ti5O5 studied by transmission electron microscope TEM

Contact Info

Product

Resources

About