{"@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/1390282680095680384.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.2320/matertrans1960.6.131"}},{"identifier":{"@type":"URI","@value":"https://www.jstage.jst.go.jp/article/matertrans1960/6/3/6_3_131/_pdf"}},{"identifier":{"@type":"NAID","@value":"130003486654"}}],"dc:title":[{"@language":"en","@value":"Mechanism of the High Temperature Yield Point Phenomenon in Some Aluminium Alloys"}],"dc:language":"en","description":[{"type":"abstract","notation":[{"@language":"en","@value":"A new type yield point phenomenon observed in some binary aluminium alloys such as Al-Mg and Al-Cu which are deformed at high temperatures above about 350°C has been reported in a previous papar. The present paper is devoted to a detailed explanation of the mechanism which controls the high temperature yield point phenomenon. The proposed theory in this work concerns the viscous motion of dislocations dragging the Cottrell atmosphere around them and the state equaton of deformation derived theoretically explains quite well the phenomenon observed at high temperatures. In the viscous motion of a dislocation, a fairly larger stress is needed to increase the dislocation velocity. This means that a remarkable yield drop must occur due to the dislocation multiplication during the deformation. This is the fundamental idea of the proposed theory to explain the high temperature yield point phenomenon. Comparing the state equations obtained experimentally and theoretically, it is deduced that the apparent relation between strain rate and stress, in which the strain rate increases in proportion to about the third power of the stress, occurs as a result of the proportional relationship of dislocation density to the second power of the stress and the proportional dependence of the dislocation velocity to the stress. The process of the increasing dislocation density calculated from the stress-strain curves shows that the density increases very rapidly in the initial deformation stage up to about 0.1% plastic strain and then gradually increases to an equilibrium density determined by the tensile conditon. For example, the equilibrium density is 2×10<SUP>9</SUP> cm<SUP>−2</SUP> and 7×10<SUP>8</SUP> cm<SUP>−2</SUP>, respectively, when strained at 400°C at strain rates of 3×10<SUP>−3</SUP> sec<SUP>−1</SUP> and 4×10<SUP>−4</SUP> sec<SUP>−1</SUP>, and 2×10<SUP>7</SUP> cm<SUP>−2</SUP> at 500°C when the strain rate is 4×10<SUP>−4</SUP> sec<SUP>−1</SUP>. The density saturation to an equilibrium value is attained more rapidly at a higher temperature.<BR>The stress-strain curves obtained by rapidly changing the tensile speed agree with the theoretical predictions from the strain rate dependence of the dislocation density. Further the theoretical prediction of the critical temperature, above which the viscous motion of dislocations dragging solute atmospheres controls the deformation, agrees well with the critical temperature for the yield point phenomenon determined experimentally. This shows that of the theory serves fairly well to explain the observation."}],"abstractLicenseFlag":"disallow"}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1410282680095680385","@type":"Researcher","personIdentifier":[{"@type":"NRID","@value":"9000253026352"}],"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/1410282680095680384","@type":"Researcher","personIdentifier":[{"@type":"NRID","@value":"9000253026353"}],"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"}]}],"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":"131","prism:endingPage":"138"},"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_131/_pdf"}],"availableAt":"1965","relatedProduct":[{"@id":"https://cir.nii.ac.jp/crid/1360011144018621824","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Die Erdölchemie GmbH"}]},{"@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 austenitic steel: Temperature and strain rate effects"}]},{"@id":"https://cir.nii.ac.jp/crid/1360285707359184768","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Transition of creep mechanism by solute hydrogen in Zircaloy-4"}]},{"@id":"https://cir.nii.ac.jp/crid/1360286991570742784","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@value":"Unique deformation behavior and microstructure evolution in high temperature processing of HfNbTaTiZr refractory high entropy alloy"}]},{"@id":"https://cir.nii.ac.jp/crid/1360292620029975424","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Solution hardening"}]},{"@id":"https://cir.nii.ac.jp/crid/1360292621204654848","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"On the Interactions of Dislocations and Solute Atoms"}]},{"@id":"https://cir.nii.ac.jp/crid/1360574095420202240","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Elektronentheoretische Untersuchungen �ber Fehlstellen in Metallen"}]},{"@id":"https://cir.nii.ac.jp/crid/1360855569223498880","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Steady-State Creep of Crystals"}]},{"@id":"https://cir.nii.ac.jp/crid/1360855569251492608","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Yield points in aluminum at high temperatures"}]},{"@id":"https://cir.nii.ac.jp/crid/1361137046112228480","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Yield Points and Delay Times in Single Crystals"}]},{"@id":"https://cir.nii.ac.jp/crid/1361137046431378304","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Distribution of solute atoms round a slow dislocation"}]},{"@id":"https://cir.nii.ac.jp/crid/1361418519980140800","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"Kritische schubspannung von aluminium-einkristallen bei höheren temperaturen"}]},{"@id":"https://cir.nii.ac.jp/crid/1362544419106489856","@type":"Article","relationType":["references"],"jpcoar:relatedTitle":[{"@value":"CXI. 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