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Creation of Innovative Functions for Zn-22Al Superplastic Alloy through Friction Stir Processing
https://kokushikan.repo.nii.ac.jp/records/13147
https://kokushikan.repo.nii.ac.jp/records/1314755ee543d-ba29-468a-af87-e0293200d97a
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本文 (7.5 MB)
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内容の要旨及び論文審査の結果の要旨 (316.3 kB)
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| Item type | 学位論文 / Thesis or Dissertation(1) | |||||
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| 公開日 | 2018-06-26 | |||||
| タイトル | ||||||
| タイトル | Creation of Innovative Functions for Zn-22Al Superplastic Alloy through Friction Stir Processing | |||||
| 言語 | en | |||||
| 言語 | ||||||
| 言語 | eng | |||||
| 資源タイプ | ||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_db06 | |||||
| 資源タイプ | doctoral thesis | |||||
| アクセス権 | ||||||
| アクセス権 | open access | |||||
| アクセス権URI | http://purl.org/coar/access_right/c_abf2 | |||||
| その他(別言語等)のタイトル | ||||||
| その他のタイトル | 摩擦攪拌プロセスによるZn-22Al超塑性合金の革新的機能の創成 | |||||
| 言語 | ja | |||||
| 著者 |
Mofidi Tabatabaei, Hamed
× Mofidi Tabatabaei, Hamed |
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| 著者ID | ||||||
| 内容記述タイプ | Other | |||||
| 内容記述 | J-GLOBAL ID : 201801016373837352 | |||||
| 発表年月日 | ||||||
| 値 | 2018-03-20 | |||||
| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | This dissertation is a systematic study on the developments of innovative functions for Zn-22Al superplastic alloy through friction stir processing (FSP), which is a type of friction stir welding (FSW). Superplastic materials are fine-grained polycrystalline solids that have recently gathered interest because of their excellent tensile elongation and behavior in superplastic forming (SPF) technology. SPF is a forming method that produces complex shaped parts in a single forming process. The grain size, which is one of the most important superplastic parameters, affects the strain rate and ductility in grain boundary sliding (GBS). In GBS, a smaller grain size leads to a larger grain boundary area that results in higher elongation and therefore more favorable superplastic behavior. In the present study, we concentrated on Zn-22Al, a commercial superplastic alloy having a wide range of applications in different fields of studies. Zn-22Al has a seismic property, which makes it applicable in buildings for energy absorption during earthquakes. Zn-22Al is also used for electronic enclosures, cabinets and panels, business machine parts, and medical and other laboratory tools. Zn-22Al has the characteristic of reaching its highest superplasticity at a relevantly lower temperature comparing other conventional superplastic alloys and can be used for superplastic forming and diffusion bonding purposes. However, applications of Zn-22Al receive some limitation especially in structural industries such as easily deformation under constant pressure due to its high strain rate sensitivity. Therefore, methods of improving mechanical properties of Zn-22Al, also developing new techniques for manufacturing new composites of this alloy would become essential. The FSP technique, which is a relatively new processing method requiring fewer processing parameters, was used in the present study to refine the grain structure and improve the mechanical and superplastic properties of Zn-22Al. The results revealed FSP can achieve fine grains and improve the superplastic properties of Zn-22Al. In addition, FSP was used for a novel forming method, known as friction stir forming (FSF), to produce multi-functional superplastic composites. By using the FSF technique, perforated steel sheet was mechanically interlocked between Zn-22Al sheets to produce a superplastic damping sheet with outstanding damping capacity. Moreover, insulated copper wire was mechanically interlocked within Zn-22Al alloy to produce a multi-functional superplastic alloy with the ability to transfer information or energy. Finally, FSF can improve the mechanical properties of Zn-22Al superplastic alloy by interlocking the stainless steel strands within the alloy. Using the friction stir based technique can have a significant scientific impact on the production of functional composites with respect to both mechanical engineering and electrical engineering. |
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| 学位名 | ||||||
| 学位名 | 博士 (工学) | |||||
| 学位授与機関 | ||||||
| 学位授与機関識別子Scheme | kakenhi | |||||
| 学位授与機関識別子 | 32616 | |||||
| 学位授与機関名 | 国士舘大学 | |||||
| 学位授与年度 | ||||||
| 内容記述タイプ | Other | |||||
| 内容記述 | 平成29年度 | |||||
| 学位授与年月日 | ||||||
| 学位授与年月日 | 2018-03-20 | |||||
| 報告番号 | ||||||
| 値 | 甲第46号 | |||||
| 学位授与番号 | ||||||
| 学位授与番号 | 甲第46号 | |||||
| NDC | ||||||
| 主題Scheme | NDC | |||||
| 主題 | 563.8 | |||||
| NDC | ||||||
| 主題Scheme | NDC | |||||
| 主題 | 566.6 | |||||
| フォーマット | ||||||
| 内容記述タイプ | Other | |||||
| 内容記述 | application/pdf | |||||
| 著者版フラグ | ||||||
| 出版タイプ | VoR | |||||
| 出版タイプResource | http://purl.org/coar/version/c_970fb48d4fbd8a85 | |||||
| キーワード | ||||||
| 値 | FSP | Friction Stir Processing | Zn-22Al | multi-functional superplastic composites | 超塑性合金 | 亜鉛合金 | アルミニウム含有合金 | |||||
