2015 Fiscal Year Final Research Report
Development of continuous high-pressure torsion for the mass production of high-strength aluminum alloy
| Project/Area Number |
26630030
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Production engineering/Processing studies
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| Research Institution | Doshisha University |
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Principal Investigator |
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| Project Period (FY) |
2014-04-01 – 2016-03-31
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| Keywords | 教ひずみ加工 / 結晶粒界 / 超微細結晶材料 |
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| Outline of Final Research Achievements |
Torsion extrusion (TE) is one of severe plastic deformation (SPD), where a long bar billet is subjected to shear strain with extrusion. This is an improved processing of high-pressure torsion (HPT) whose disadvantage is batch processing applicable for only short or small billet. However, in conventional TE, deformation processing is composed of two parts, which are extremely localized straining and rigid body rotation. Thus, the deformation is not efficient in view of grain size reduction and strengthening. In this project, we developed new type of TE where shear straining can be applied in more effective manner by modifying die geometry so that shear strain become more uniform throughout deformation process. We demonstrated the grain size is become smaller than that by the conventional process.
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| Free Research Field |
材料工学 組織制御
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