{"title":"Strengthening of aluminium-lithium alloys by long-range ordered δ'-precipitates","authors":"C. Schlesier, E. Nembach","doi":"10.1016/0956-7151(95)00089-E","DOIUrl":null,"url":null,"abstract":"<div><p>Strengthening of aluminium-rich aluminium-lithium single crystals by spherical, coherent particles of Ll<sub>2</sub>-long-range ordered δ'-phase has been investigated experimentally and theoretically. The total critical resolved shear stress<em>τ<sub>1</sub></em> has been measured as a function of the radius<em>r</em> and the volume fraction <em>f</em> of the δ'-particles. <em>r</em> and <em>f</em> covered the ranges 0.0–17.6 and 0.0–0.11, respectively. The δ'-particles' contribution τ<sub>p</sub> to τ<sub>t</sub> is analysed with reference to a model, which had originally been developed for the description of the strengthening effect of L1<sub>2</sub>-long-range ordered γ'-particles in nickel-base superalloys. The experimental data τ<sub>p(r,f)</sub> of the present aluminium-lithium single crystals are well represented by this model. This specific antiphase boundary energy of the δ'-particles has been found to be 0.070 ± 0.020J/m<sup>2</sup>. This value refers to {111}-planes.</p></div>","PeriodicalId":100018,"journal":{"name":"Acta Metallurgica et Materialia","volume":"43 11","pages":"Pages 3983-3990"},"PeriodicalIF":0.0000,"publicationDate":"1995-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0956-7151(95)00089-E","citationCount":"44","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Acta Metallurgica et Materialia","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/095671519500089E","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 44
Abstract
Strengthening of aluminium-rich aluminium-lithium single crystals by spherical, coherent particles of Ll2-long-range ordered δ'-phase has been investigated experimentally and theoretically. The total critical resolved shear stressτ1 has been measured as a function of the radiusr and the volume fraction f of the δ'-particles. r and f covered the ranges 0.0–17.6 and 0.0–0.11, respectively. The δ'-particles' contribution τp to τt is analysed with reference to a model, which had originally been developed for the description of the strengthening effect of L12-long-range ordered γ'-particles in nickel-base superalloys. The experimental data τp(r,f) of the present aluminium-lithium single crystals are well represented by this model. This specific antiphase boundary energy of the δ'-particles has been found to be 0.070 ± 0.020J/m2. This value refers to {111}-planes.
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