Defect and Diffusion Forum Vol. 373 | p. 3

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<div class="page-name-block underline-begin"> <h1 class="page-name-block-text">Defect and Diffusion Forum Vol. 373</h1> </div> <div class="clearfix title-details"> <div class="papers-block-info col-lg-12"> <div class="row"> <div class="info-row-name normal-text-gray col-md-2 col-sm-3 col-xs-4"> <div class="row"> <p>DOI:</p> </div> </div> <div class="info-row-content semibold-middle-text col-md-10 col-sm-9 col-xs-8"> <div class="row"> <p><a href="https://doi.org/10.4028/www.scientific.net/DDF.373">https://doi.org/10.4028/www.scientific.net/DDF.373</a></p> </div> </div> </div> </div> <div id="titleMarcXmlLink" style="display: none" class="papers-block-info col-lg-12"> <div class="row"> <div class="info-row-name normal-text-gray col-md-2 col-sm-3 col-xs-4"> <div class="row"> <p>Export:</p> </div> </div> <div class="info-row-content semibold-middle-text col-md-10 col-sm-9 col-xs-8"> <div class="row"> <p><a href="/DDF.373/marc.xml">MARCXML</a></p> </div> </div> </div> </div> <div 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rel="next">…</a></li><li class="PagedList-skipToNext"><a href="/DDF.373/4" rel="next">></a></li><li class="PagedList-skipToLast"><a href="/DDF.373/7">>></a></li></ul></div> </div> <div class="block-volume-title normal-text-gray"> <p> Paper Title <span>Page</span> </p> </div> <div class="item-block"> <div class="item-link"> <a href="/DDF.373.104">The Evolution Behavior of Defects in the Nanofilms of W/Cu and W Probed by Doppler Broadening Positron Annihilation Spectroscopy</a> </div> <div class="item-link volume-authors"> <div class="semibold-middle-text"> Authors: Ling Wang, Ai Hong Deng, Kang Wang, Yong Wang, Xiao Bo Lu, Yuan Wang, Ran Li </div> </div> <div id="abstractTextBlock495171" class="volume-info volume-info-text volume-info-description"> Abstract: W/Cu multilayer nanofilms and pure W nanofilms were prepared in pure Ar and He/Ar mixing atmosphere by radio frequency magnetron sputtering method. The defect evolution of the samples was characterized by Doppler broadening positron annihilation spectroscopy (DB-PAS).The results show that plenty of defects can be produced by introducing helium (He) into W/Cu multilayer nanofilms. With the natural storage time increasing, the helium located in the near surface of W/Cu multilayer nanofilm would be released gradually and induce the coalescence of the helium related defects due to the diffusion of the helium and defects. In addition, the pure W nanofilms were irradiated by 30 keV helium ions and 40 keV hydrogen (H) ions in sequence at room temperature. From the DB-PAS analysis, it can be shown that a large number of vacancy-type defects are produced due to the He and/or H irradiation. H ions would be trapped by He related defects and produced He-H-V complexes. </div> <div> <a data-readmore="{ block: '#abstractTextBlock495171', lines: 2, expandText: '...more', collapseText: '...less' }"></a> </div> <div class="page-number semibold-large-text"> 104 </div> </div> <div class="item-block"> <div class="item-link"> <a href="/DDF.373.108">Evolution of the Helium-Related Defect in Polycrystalline Tungsten</a> </div> <div class="item-link volume-authors"> <div class="semibold-middle-text"> Authors: Xiao Bo Lu, Ai Hong Deng, Yong Wang, Kang Wang, Ling Wang </div> </div> <div id="abstractTextBlock495172" class="volume-info volume-info-text volume-info-description"> Abstract: The evolution of the helium-related defect in polycrystalline tungsten was studied by Doppler Broadening Positron Annihilation Spectroscopy and Scanning Electron Microscope as functions of annealing temperature and implantation fluence. The experimental results showed that the defect type was not changed at lower annealing temperature, and the decline of S parameter manifested that the lower temperature annealing led the decrease of defect concentration. In addition there existed the same defect type with the increment of the implantation fluence, thus the rise of S parameter implied the increase of the defect concentration. </div> <div> <a data-readmore="{ block: '#abstractTextBlock495172', lines: 2, expandText: '...more', collapseText: '...less' }"></a> </div> <div class="page-number semibold-large-text"> 108 </div> </div> <div class="item-block"> <div class="item-link"> <a href="/DDF.373.113">Fe<sup>+</sup> Implantation Induced Damage in Oxide Dispersion Strengthened Steels Investigated by Doppler Broadening Spectroscopy</a> </div> <div class="item-link volume-authors"> <div class="semibold-middle-text"> Authors: Wolfgang Anwand, Teresa Leguey, Masa Scepanovic, Fernando Jose Sanchez, Isabel García-Cortés, Andreas Wagner </div> </div> <div id="abstractTextBlock495182" class="volume-info volume-info-text volume-info-description"> Abstract: Open volume defects created by 1 MeV Fe<sup>+</sup> implantation up to a damage of 15 displacements per atom into Fe14wt%Cr and into oxide dispersion strengthened (ODS) Fe14wt%Cr were investigated by positron annihilation spectroscopy, especially single Doppler broadening (DBS) and coincidence Doppler broadening spectroscopies (cDBS). The influence of W and Ti alloying elements on the evolution of defects during ion implantation were probed in addition. Whereas no effect of the W and Ti alloying constituents on the line-shape parameters S and W could be detected both before and after ion implantation, fine dispersed Y<sub>2</sub>O<sub>3</sub> particles showed important changes in the structural properties compared to pure FeCr steel, which could be detected by DBS and cDBS. The distribution of the electron momenta in implanted ODS Fe14Cr, obtained with cDBS, shows that oxide particles form obstacles for expanded vacancy mobility and that the vacancies are localized around the oxide particles. </div> <div> <a data-readmore="{ block: '#abstractTextBlock495182', lines: 2, expandText: '...more', collapseText: '...less' }"></a> </div> <div class="page-number semibold-large-text"> 113 </div> </div> <div class="item-block"> <div class="item-link"> <a href="/DDF.373.117">Synergistic Effect on Formation of Radiation Damage in CLAM Steel Studied by Triple Beam Irradiation</a> </div> <div class="item-link volume-authors"> <div class="semibold-middle-text"> Authors: Da Qing Yuan, Hai Liang Ma, Ping Fan, Yong Nan Zheng, Yi Zuo, Qiao Li Zhang, Ali Wen, Wei Feng, Jun Chen Liang, Wen Jun Xiong, Xiao Qiang Ma, Bao Qun Cui, Li Hua Chen, Wei Sheng Jiang, Qun Ying Huang, Yi Can Wu, Peng Lei, Xing Zhong Cao, Bao Yi Wang, Long Wei, Hai Hong Xia, Sheng Yun Zhu </div> </div> <div id="abstractTextBlock495183" class="volume-info volume-info-text volume-info-description"> Abstract: The synergistic effect associated with displacement damage, hydrogen and heliumin the China Low Activation Martensitic (CLAM) steel has been investigated using the triple ion beamirradiation. Triple ion beams, an iron beam of 109 MeV degraded by a tantalum foil of 7.45 μm thick, the100 keV hydrogen and 200 keV helium, were injected into the CLAM steel samples simultaneously or sequentially.The radiation damage examinations were carried out by the slow positron Doppler broadening technique. Themeasured S parameters indicate that the radiation damage is different for different irradiationprocedures with same dpa and concentrations of H and He. The sample suffers most severe damage in the simultaneoustriple beam irradiation. The present experimental results support the molecular dynamics simulation result that the H facilitates the He-bubble nucleation and growth. </div> <div> <a data-readmore="{ block: '#abstractTextBlock495183', lines: 2, expandText: '...more', collapseText: '...less' }"></a> </div> <div class="page-number semibold-large-text"> 117 </div> </div> <div class="item-block"> <div class="item-link"> <a href="/DDF.373.122">Hydrogen-Induced Defects in Titanium</a> </div> <div class="item-link volume-authors"> <div class="semibold-middle-text"> Authors: Petr Hruška, Jakub Čížek, František Lukáč, Jan Knapp, Sylvie Mašková, Jan Drahokoupil, Oksana Melikhova, Ivan Procházka </div> </div> <div id="abstractTextBlock496435" class="volume-info volume-info-text volume-info-description"> Abstract: The aim of this work was investigation of hydrogen interaction with defects in Ti. Well-annealed Ti samples were loaded with hydrogen either electrochemically or using H<sub>2</sub> gas phase. The hydrogen content and the phase composition of hydrogen loaded samples was determined by thermogravimetric analysis and by X-ray diffraction (XRD) respectively. Positron lifetime (LT) spectroscopy was employed for investigation of defects created by hydrogen loading. High-temperature H<sub>2</sub> gas loading led to complete transformation of the whole sample into δ-TiH<sub>2</sub> while low-temperature H<sub>2</sub> gas loading and the electrochemical loading resulted in a non-uniform structure with most of the hydrogen absorbed in a sub-surface layer. All hydrogen-loaded samples exhibit positron lifetime component of ≈ 170 ps corresponding to positrons trapped at dislocations. Vacancy clusters were observed in the electrochemically loaded sample and the H<sub>2</sub> gas phase loaded sample at low temperature. </div> <div> <a data-readmore="{ block: '#abstractTextBlock496435', lines: 2, expandText: '...more', collapseText: '...less' }"></a> </div> <div class="page-number semibold-large-text"> 122 </div> </div> <div class="item-block"> <div class="item-link"> <a href="/DDF.373.126">Study of Defects Introduced by 2 and 9 MeV Electron Irradiation in B2 Type Fe-Al Alloy</a> </div> <div class="item-link volume-authors"> <div class="semibold-middle-text"> Authors: Youhei Ueno, Akihiro Iwase, Kazuhito Ohsawa, Qiu Xu, Koichi Sato, Yuichi Saitoh, Fuminobu Hori </div> </div> <div id="abstractTextBlock496442" class="volume-info volume-info-text volume-info-description"> Abstract: It is well known that intermetallic compound alloys possibly include more than two types of vacancies basically, that is A-vacancy and B-vacancy in A-B compound alloy. Although MeV ordered electron irradiation produces vacancies and interstitials, the threshold energy of displacement for each elemental atom in intermetallic alloys is not necessarily same. Then the defect type introduced by the irradiation depends on electron energy. In this study, we performed positron annihilation lifetime and Doppler broadening measurements for different energy of electron irradiated B2 type Fe50%Al alloy. The values of positron annihilation lifetime for this alloy after 2 and 9 MeV electron irradiation were 200 and 172 psec, respectively. Also, the Doppler broadening parameters S and W show difference for this alloy with different energy of electron irradiation. These results suggest that different types of vacancy were induced into Fe-Al compound alloy by electron irradiation with different energies. </div> <div> <a data-readmore="{ block: '#abstractTextBlock496442', lines: 2, expandText: '...more', collapseText: '...less' }"></a> </div> <div class="page-number semibold-large-text"> 126 </div> </div> <div class="item-block"> <div class="item-link"> <a href="/DDF.373.130">Structural Relaxation of Open Volume in Hyper-Eutectic Zr-Cu-Al Bulk Amorphous Alloys Measured by Positron Annihilation</a> </div> <div class="item-link volume-authors"> <div class="semibold-middle-text"> Authors: Taishi Ishiyama, Kazukui Kobayashi, Yoshihiko Yokoyama, Toyohiko J. Konno, Akihiro Iwase, Fuminobu Hori </div> </div> <div id="abstractTextBlock496446" class="volume-info volume-info-text volume-info-description"> Abstract: The Zr-Cu-Al bulk amorphous (BA) alloys, which have no long-range ordered structure, possess various properties such as high strength and toughness with compositional dependence. In the present study, in order to estimate the natures of local structure change and relaxation behavior of hyper-eutectic BA alloys during annealing, positron annihilation measurements and density measurement have been performed for hyper-eutectic Zr-Cu-Al BA alloys with annealing. The enthalpy relaxation and structural relaxation was also measured by differential scanning calorimetry (DSC) measurement. These results show that the relaxation process of free volume containing in hyper-eutectic BA alloys is different from that in hypo-eutectic alloys. </div> <div> <a data-readmore="{ block: '#abstractTextBlock496446', lines: 2, expandText: '...more', collapseText: '...less' }"></a> </div> <div class="page-number semibold-large-text"> 130 </div> </div> <div class="item-block"> <div class="item-link"> <a href="/DDF.373.134">A Preliminary Study of Oxidation Behavior of Mo-50Re Alloy at Different Temperature Using Positron Annihilation Lifetime Spectroscopy</a> </div> <div class="item-link volume-authors"> <div class="semibold-middle-text"> Authors: Zhe Jie Zhu, Wei Yang, Jian Jian Shi, Tong Guang Zhai, Yi Chu Wu </div> </div> <div id="abstractTextBlock497316" class="volume-info volume-info-text volume-info-description"> Abstract: The oxidized Mo-50Re alloys in air at 573 K and 873 K for various times were investigated by X-Ray diffraction and positron annihilation lifetime spectroscopy. The results indicated that main orthogonal phase MoO<sub>3</sub> together with small amount of monoclinic phase Mo<sub>8</sub>O<sub>23</sub> were formed on on the surface of the specimens, and the oxide film of specimens oxidized at 873 K were much thicker than that of specimens oxidized at 573 K. Meanwhile, when Mo-50Re specimens oxidized in air at 873K, the defect’s size within interface layer of the specimens was larger, and the oxide film on the surface of the specimens contained much more defects. Faster oxidation process were observed occured at 873K, which was likely due to the formation of larger-size interfacial defects. </div> <div> <a data-readmore="{ block: '#abstractTextBlock497316', lines: 2, expandText: '...more', collapseText: '...less' }"></a> </div> <div class="page-number semibold-large-text"> 134 </div> </div> <div class="item-block"> <div class="item-link"> <a href="/DDF.373.138">Positron Spectroscopy of Defects in Hydrogen-Saturated Zirconium</a> </div> <div class="item-link volume-authors"> <div class="semibold-middle-text"> Authors: Yurii Bordulev, K. Lee, Roman S. Laptev, Viktor N. Kudiiarov, Andrey M. Lider </div> </div> <div id="abstractTextBlock494837" class="volume-info volume-info-text volume-info-description"> Abstract: Zirconium alloys, such as Zr-1Nb are widely used as cladding materials for nuclear fuel elements of light water reactors. Hydrogen embrittlement problem causes degradation of these parts of nuclear reactors. It is known, that hydrogen uptake causes changes in microstructure and defect structure of metals. The aim of this work is study of Zr-1Nb alloys’ defect structure after hydrogen saturation up to the concentration of 600 ppm. Saturation of hydrogen was carried out from the gas phase under high temperature and pressure. This study reveals the increase of average positron lifetime with the increase of hydrogen concentration. Value of the average positron lifetime achieves plateau when the concentration of hydrogen is about 600 ppm. Also the following effects were detected in the material after hydrogen uptake up to different concentrations: crystal lattice expansion, dislocations and vacancy-like defects formation, as well as the defect-hydrogen complexes formation. </div> <div> <a data-readmore="{ block: '#abstractTextBlock494837', lines: 2, expandText: '...more', collapseText: '...less' }"></a> </div> <div class="page-number semibold-large-text"> 138 </div> </div> <div class="item-block"> <div class="item-link"> <a href="/DDF.373.142">Study the Effect of Plastic Deformation in 8006 Al-Alloys by Positron Lifetime Spectroscopy, Vickers Hardness and X-Ray Diffraction</a> </div> <div class="item-link volume-authors"> <div class="semibold-middle-text"> Authors: Emad A. Badawi, M.A. Abdel-Rahman, Mohammed Salah, Mohamed Abdel-Rahman </div> </div> <div id="abstractTextBlock494925" class="volume-info volume-info-text volume-info-description"> Abstract: Due to the great effect of defects on the properties of the material including strength, ductility, resistivity and opacity, there are many techniques that are used in defect detecting. Positron annihilation spectroscopy (PAS), Vickers hardness, and X-ray diffraction were used to study the influence of plastic deformation on the properties of 8006 Al-alloy in this work. An increase in the positron lifetime and Vickers hardness with a bit Broadening of XRD peaks was observed with increasing the degree of deformation reflecting a large dislocation density produced by plastic deformation. </div> <div> <a data-readmore="{ block: '#abstractTextBlock494925', lines: 2, expandText: '...more', collapseText: '...less' }"></a> </div> <div class="page-number semibold-large-text"> 142 </div> </div> <div class="block-bottom-pagination"> <div class="pager-info"> <p>Showing 21 to 30 of 68 Paper Titles</p> </div> <div class="pagination-container"><ul class="pagination"><li class="PagedList-skipToPrevious"><a href="/DDF.373/2" rel="prev"><</a></li><li><a href="/DDF.373">1</a></li><li><a href="/DDF.373/2">2</a></li><li class="active"><span>3</span></li><li><a href="/DDF.373/4">4</a></li><li><a href="/DDF.373/5">5</a></li><li class="PagedList-ellipses"><a class="PagedList-skipToNext" href="/DDF.373/6" rel="next">…</a></li><li class="PagedList-skipToNext"><a href="/DDF.373/4" rel="next">></a></li><li class="PagedList-skipToLast"><a href="/DDF.373/7">>></a></li></ul></div> </div> </div> </div> </div> </div> </div> </div> <div class="social-icon-popup"> <a href="https://www.facebook.com/Scientific.Net.Ltd/" target="_blank" rel="noopener" title="Scientific.Net"><i class="inline-icon facebook-popup-icon social-icon"></i></a> <a href="https://twitter.com/Scientific_Net/" target="_blank" rel="noopener" title="Scientific.Net"><i class="inline-icon twitter-popup-icon social-icon"></i></a> <a href="https://www.linkedin.com/company/scientificnet/" target="_blank" rel="noopener" title="Scientific.Net"><i class="inline-icon linkedin-popup-icon social-icon"></i></a> </div> </div> <div class="sc-footer"> <div class="footer-fluid"> <div class="container"> <div class="row"> <div class="footer-menu col-md-12 col-sm-12 col-xs-12"> <ul class="list-inline menu-font"> <li><a href="/ForLibraries">For Libraries</a></li> <li><a href="/ForPublication/Paper">For Publication</a></li> <li><a href="/insights" target="_blank">Insights</a></li> <li><a href="/DocuCenter">Downloads</a></li> <li><a href="/Home/AboutUs">About Us</a></li> <li><a href="/PolicyAndEthics/PublishingPolicies">Policy & Ethics</a></li> <li><a href="/Home/Contacts">Contact Us</a></li> <li><a href="/Home/Imprint">Imprint</a></li> <li><a href="/Home/PrivacyPolicy">Privacy Policy</a></li> <li><a href="/Home/Sitemap">Sitemap</a></li> <li><a href="/Conferences">All Conferences</a></li> <li><a href="/special-issues">All Special Issues</a></li> <li><a href="/news/all">All News</a></li> <li><a href="/read-and-publish-agreements">Read & Publish Agreements</a></li> </ul> </div> </div> </div> </div> <div class="line-footer"></div> <div class="footer-fluid"> <div class="container"> <div class="row"> <div class="col-xs-12"> <a href="https://www.facebook.com/Scientific.Net.Ltd/" target="_blank" rel="noopener" title="Scientific.Net"><i class="inline-icon facebook-footer-icon social-icon"></i></a> <a href="https://twitter.com/Scientific_Net/" target="_blank" rel="noopener" title="Scientific.Net"><i class="inline-icon twitter-footer-icon social-icon"></i></a> <a href="https://www.linkedin.com/company/scientificnet/" target="_blank" rel="noopener" title="Scientific.Net"><i class="inline-icon linkedin-footer-icon social-icon"></i></a> </div> </div> </div> </div> <div class="line-footer"></div> <div class="footer-fluid"> <div class="container"> <div class="row"> <div class="col-xs-12 footer-copyright"> <p> © 2024 Trans Tech Publications Ltd. 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Defect and Diffusion Forum Vol. 373 | p. 3 | Scientific.Net