{"@context":{"@vocab":"https://cir.nii.ac.jp/schema/1.0/","rdfs":"http://www.w3.org/2000/01/rdf-schema#","dc":"http://purl.org/dc/elements/1.1/","dcterms":"http://purl.org/dc/terms/","foaf":"http://xmlns.com/foaf/0.1/","prism":"http://prismstandard.org/namespaces/basic/2.0/","cinii":"http://ci.nii.ac.jp/ns/1.0/","datacite":"https://schema.datacite.org/meta/kernel-4/","ndl":"http://ndl.go.jp/dcndl/terms/","jpcoar":"https://github.com/JPCOAR/schema/blob/master/2.0/"},"@id":"https://cir.nii.ac.jp/crid/1390001205118968960.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.2320/matertrans1960.6.123"}},{"identifier":{"@type":"URI","@value":"https://www.jstage.jst.go.jp/article/matertrans1960/6/3/6_3_123/_pdf"}},{"identifier":{"@type":"NAID","@value":"130003486653"}}],"dc:title":[{"@language":"en","@value":"New Yielding Phenomenon in Some Aluminium Alloys at High Temperatures"}],"dc:language":"en","description":[{"type":"abstract","notation":[{"@language":"en","@value":"A new type yielding phenomenon was observed in Al-Mg and Al-Cu alloys which were pulled at high temperatures above about 350°C. In order to determine characteristics of this high temperature yielding phenomenon, several binary aluminium alloys were investigated by tensile tests at various temperatures from room temperature to 500°C and at various strain rates from 4×10<SUP>−4</SUP> to 4×10<SUP>−2</SUP> sec<SUP>−1</SUP>. The results were as follows: (1) This yielding was observed only in Al-Mg and Al-Cu alloys which were relatively large in the size difference between solute and solvent atoms, but it was not shown in pure aluminium and its alloys such as Al-Ag, Al-Li and Al-Zn which were relatively small in the atomic size difference. (2) This yielding was observed to occur from a lower temperature with the increase of the solute concentration and the decrease of the strain rate. (3) Work hardening after the yield drop was practically zero. (4) The stress drop in this high temperature yielding was not so rapid as those in usual yielding phenomena, but it proceeds relatively slowly. The pre-yield strain in this yielding was fairly large. (5) Under a condition where this type of yielding was observed,the flow stress was severely affected by the test temperature and the strain rate. The temperature and strain rate dependences of the flow stress can be expressed by the state equation<BR>\\dotε=<I>A</I>σ<I><SUP>n</SUP></I>exp(−<I>U</I><SUB>0</SUB>⁄<I>kT</I>).<BR>In Al-5.5 at% Mg, <I>n</I>=2,8∼3.3 and <I>U</I><SUB>0</SUB>=1.4 eV. In Al-2.2 at% Cu, <I>n</I>=4.5 and <I>U</I><SUB>0</SUB>=1.5 eV. (6) This yielding reappeared by annealing at the test temperatures. (7) No heterogeneous deformation related to this yielding phenomenon took place, the flow stress was independent of grain size.<BR>From these experimental results it may be concluded that under the condition where the high temperature yielding occurs, the plastic deformation is controlled by the viscous motion of dislocations which drag the solute atmosphere around them and thereby the increase in the mobile dislocation density during plastic deformation causes a remarkable yield drop, as proposed by Johnston."}],"abstractLicenseFlag":"disallow"}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1410001205118968832","@type":"Researcher","personIdentifier":[{"@type":"NRID","@value":"9000253026354"}],"foaf:name":[{"@language":"en","@value":"Horiuchi Ryo"}],"jpcoar:affiliationName":[{"@language":"en","@value":"Institute of Space and Aeronautical Science, University of Tokyo"},{"@language":"ja","@value":"Institute of Space and Aeronautical Science, University of Tokyo"}]},{"@id":"https://cir.nii.ac.jp/crid/1410001205118968960","@type":"Researcher","personIdentifier":[{"@type":"NRID","@value":"9000253026355"}],"foaf:name":[{"@language":"en","@value":"Yoshinaga Hideo"}],"jpcoar:affiliationName":[{"@language":"en","@value":"Institute of Space and Aeronautical Science, University of Tokyo"},{"@language":"ja","@value":"Institute of Space and Aeronautical Science, University of Tokyo"}]},{"@id":"https://cir.nii.ac.jp/crid/1410001205118968961","@type":"Researcher","personIdentifier":[{"@type":"NRID","@value":"9000253026356"}],"foaf:name":[{"@language":"en","@value":"Hama Shigeo"}],"jpcoar:affiliationName":[{"@language":"en","@value":"Institute of Space and Aeronautical Science, University of Tokyo"},{"@language":"ja","@value":"Institute of Space and Aeronautical Science, University of Tokyo"}]}],"publication":{"publicationIdentifier":[{"@type":"PISSN","@value":"00214434"},{"@type":"EISSN","@value":"24324701"}],"prism:publicationName":[{"@language":"en","@value":"Transactions of the Japan Institute of Metals"},{"@language":"ja","@value":"Transactions of the Japan Institute of Metals"},{"@language":"ja","@value":"Trans. JIM"},{"@language":"en","@value":"Trans. JIM"}],"dc:publisher":[{"@language":"en","@value":"The Japan Institute of Metals"},{"@language":"ja","@value":"社団法人 日本金属学会"}],"prism:publicationDate":"1965","prism:volume":"6","prism:number":"3","prism:startingPage":"123","prism:endingPage":"130"},"reviewed":"false","dcterms:accessRights":"http://purl.org/coar/access_right/c_abf2","url":[{"@id":"https://www.jstage.jst.go.jp/article/matertrans1960/6/3/6_3_123/_pdf"}],"availableAt":"1965","relatedProduct":[{"@id":"https://cir.nii.ac.jp/crid/1360004232237009536","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Effect of yttrium addition on the hot deformation behaviors and microstructure development of magnesium alloy"}]},{"@id":"https://cir.nii.ac.jp/crid/1360016870442114560","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Solid-solution hardening by hydrogen in Fe–Cr–Ni-based 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