Effects of ion irradiation on structural and mechanical properties of crystalline Fe/amorphous SiOC nanolaminates

Zare, A.; Su, Qing; Gigax, Jonathan; Shojaee, S.A.; Nastasi, M.; Shao, Lin; Lucca, D.A.

doi:10.1016/j.actamat.2017.08.031

Cited by 21 publications

(18 citation statements)

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“…The simulations were performed using the ion distribution and quick calculation of damage option in Stopping and Range of Ions in Matter (SRIM) 25 . The density used for the SiOC was 2.2 g/cm 3 20 and the displacement energies of Si, O, and C were 15, 28, 28 eV, respectively 23 , 26 . For Fe, the density used was 6.92 g/cm 3 27 and the displacement energy was 40 eV 26 .…”

Section: Resultsmentioning

confidence: 99%

“…Potential applications of these nanolaminates include advanced reactor designs and fuel cycle technologies 20 , 22 , 24 . Our studies of the mechanical response of SiOC/Fe nanolaminates, with individual layer thicknesses of 72 ± 10 nm, that were subjected to 3.5 MeV Fe ions to damage levels of 10, 20, or 50 displacements per atom (dpa) demonstrated a lower magnitude of irradiation hardening for the nanolaminate compared to films consisting of only SiOC or Fe 23 . Despite the desirable mechanical properties and irradiation tolerance of the SiOC/Fe nanolaminates, their mechanical response after He implantation has not been reported.…”

Section: Introductionmentioning

confidence: 82%

“…Our previous studies on SiOC demonstrated that He bubble formation can be entirely averted due to the rapid diffusion of implanted ions out of the structure 13 , 19 . It was also demonstrated that amorphous/crystalline nanolaminates consisting of amorphous SiOC/crystalline α-Fe have desirable structural stability over a range of irradiation/implantation conditions (i.e., ion species, energy, and temperature) 20 – 23 . Potential applications of these nanolaminates include advanced reactor designs and fuel cycle technologies 20 , 22 , 24 .…”

Section: Introductionmentioning

confidence: 99%

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Mechanical Response of He-Implanted Amorphous SiOC/Crystalline Fe Nanolaminates

Zare

Gigax

et al. 2019

Sci Rep

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This study investigates the microstructural evolution and mechanical response of sputter-deposited amorphous silicon oxycarbide (SiOC)/crystalline Fe nanolaminates, a single layer SiOC film, and a single layer Fe film subjected to ion implantation at room temperature to obtain a maximum He concentration of 5 at. %. X-ray diffraction and transmission electron microscopy indicated no evidence of implantation-induced phase transformation or layer breakdown in the nanolaminates. Implantation resulted in the formation of He bubbles and an increase in the average size of the Fe grains in the individual Fe layers of the nanolaminates and the single layer Fe film, but the bubble density and grain size were found to be smaller in the former. By reducing the thicknesses of individual layers in the nanolaminates, bubble density and grain size were further decreased. No He bubbles were observed in the SiOC layers of the nanolaminates and the single layer SiOC film. Nanoindentation and scanning probe microscopy revealed an increase in the hardness of both single layer SiOC and Fe films after implantation. For the nanolaminates, changes in hardness were found to depend on the thicknesses of the individual layers, where reducing the layer thickness to 14 nm resulted in mitigation of implantation-induced hardening.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 82%

Section: Introductionmentioning

confidence: 99%

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Mechanical Response of He-Implanted Amorphous SiOC/Crystalline Fe Nanolaminates

Zare

Gigax

et al. 2019

Sci Rep

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“…In addition, amorphous SiOC has been shown to have high crystallization temperatures (over 1300 °C), good oxidation and creep resistance [10][11][12][13][14][15]. Composite systems based on SiOC, such as amorphous-SiOC/crystalline-Fe nanostructures, show enhanced radiation-tolerance due to the presence of amorphous-crystalline interfaces which act as strong sinks for defects [16][17][18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

“…Previous studies have mainly focused on Young's modulus and hardness of SiOC using micro/nano-indentation tests [6,24,25]. It was found that irradiation leads to an apparent densification and a subsequent increase in elastic modulus and hardness of the SiOC [6,17,24]. The stress-strain behavior of the materials is rarely measured because of the complex stress/strain field underneath the indenter.…”

Section: Introductionmentioning

confidence: 99%