Creation of Innovative Functions for Zn-22Al Superplastic Alloy through Friction Stir Processing

• 資料種別: 博士論文
• タイトル: Creation of Innovative Functions for Zn-22Al Superplastic Alloy through Friction Stir Processing
• 著者・編者: Mofidi Tabatabaei, Hamed
• 著者標目: Mofidi Tabatabaei, Hamed
• 出版年月日等: 2018-03-20
• 出版年（W3CDTF）: 2018-03-20
• 並列タイトル等: 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
• 授与機関名: 国士舘大学
• 授与年月日: 2018-03-20
• 授与年月日（W3CDTF）: 2018-03-20
• 報告番号: 甲第46号
• 学位: 博士 (工学)
• 博論授与番号: 甲第46号
• 本文の言語コード: eng
• 著者別名: モフィディ タバタバイ, ハメッド
• 件名標目: 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
• NDC: 563.8; 566.6
• 対象利用者: 一般
• 一般注記: J-GLOBAL ID : 201801016373837352; 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.; 平成29年度; application/pdf
• 国立国会図書館永続的識別子: info:ndljp/pid/11122929; https://dl.ndl.go.jp/pid/11122929
• コレクション（共通）: 障害者向け資料
• コレクション（障害者向け資料：レベル1）: テキストデータ
• コレクション（個別）: 国立国会図書館デジタルコレクション > デジタル化資料 > 博士論文; https://dl.ndl.go.jp/collections/A00014
• 収集根拠: 博士論文（自動収集）
• 受理日（W3CDTF）: 2018-08-03T23:36:01+09:00
• 作成日（W3CDTF）: 2018-06-26
• 記録形式（IMT）: PDF; application/pdf
• オンライン閲覧公開範囲: 国立国会図書館内限定公開
• デジタル化資料送信: 図書館・個人送信対象外
• 遠隔複写可否（NDL）: 可
• 掲載誌（URI）: https://kokushikan.repo.nii.ac.jp/records/13147
• 連携機関・データベース: 国立国会図書館 : 国立国会図書館デジタルコレクション; https://dl.ndl.go.jp

目次

2023-09-02 再収集

2023-09-02 再収集