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博士論文
Creation of Innovative Functions for Zn-22Al Superplastic Alloy through Friction Stir Processing
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Creation of Innovative Functions for Zn-22Al Superplastic Alloy through Friction Stir Processing
- 国立国会図書館永続的識別子
- info:ndljp/pid/11122929
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- J-GLOBAL ID : 201801016373837352This dissertation is a systematic study on the developments of innovative functions for Zn-22Al superplastic alloy thr...
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デジタル
- 資料種別
- 博士論文
- タイトル
- 著者・編者
- 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
- 対象利用者
- 一般
- 一般注記
- J-GLOBAL ID : 201801016373837352This 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
- コレクション(共通)
- コレクション(障害者向け資料:レベル1)
- 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
- 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)
- PDFapplication/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
- 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