巨大ひずみ加工を必要としないナノ結晶金属の創製

2013 Fiscal Year Annual Research Report

• Project/Area Number: 25600039
• Research Institution: Kyoto University
• Principal Investigator: 辻 伸泰 京都大学, 工学(系)研究科(研究院), 教授 (30263213)
• Project Period (FY): 2013-04-01 – 2014-03-31
• Keywords: ナノ結晶 / 再結晶 / 変形 / 転位 / 力学特性 / 粒成長 / 塑性不安定 / 強加工

Research Abstract

本研究の目的は、いわゆる巨大ひずみ加工を行わずに、平均結晶粒径１μｍ以下の完全再結晶ナノ結晶粒組織を有する金属材料を創製することである。積層欠陥エネルギーの極めて低い合金系や超髙合金など、3種類の異なる合金系に対して通常の冷間圧延と種々の条件の焼鈍を行い、どれだけ微細な再結晶組織が得られるのか、その限界を１年間の集中的な研究により明らかにする。
Fe-30Mn-3Al-3Si、Cu-6.8Al、CrMnFeCoNi High Entropy Alloyという当初予定の３種類の合金において、それぞれ最適な加工と焼鈍熱処理を組み合わせることによって、平均粒径200～500nmの完全再結晶ナノ組織を得ることに成功した。これら完全再結晶ナノ組織合金が、いずれも優れた強度と延性を示すことを見いだした。

Research Products

• [Journal Article] Formation of Fully Annealed Nanocrystalline Austenite in Fe-Ni-C Alloy (2014)
  • Author(s): Shuai Chen, Akinobu Shibata, Si Gao and Nobuhiro Tsuji
  • Journal Title: Mater. Trans Volume: Vol.55, No.1 Pages: 223-226
  • DOI: 10.2320/matertrans.M2013324
• [Journal Article] Mechanical properties of bulk ultrafine grained aluminum fabricated by torsion deformation at various temperatures and strain rates (2014)
  • Author(s): Sunisa Khamsuk, Nokeun Park, Si Gao, Daisuke Terada, Hiroki Adachi and Nobuhiro Tsuji
  • Journal Title: Mater. Trans. (Hall-Petch special issue) Volume: 55 Pages: 106-113
  • DOI: 10.2320/matertrans.MA201321
  • Peer Reviewed
• [Journal Article] Nanocrystalline Twinning Induced Plasticity Steel with Superior Mechanical Properties Fabricated by Cold Rolling and Annealing (2013)
  • Author(s): Rajib Saha, Rintaro Ueji and Nobuhiro Tsuji
  • Journal Title: Mater. Sci. Forum Volume: Vol.753 Pages: 518-521
  • DOI: 10.4028/www.scientific.net/MSF.753.518
• [Journal Article] Fully Recrystallized Nanostructure Fabricated without Severe Plastic Deformation in High-Mn Austenitic Steel (2013)
  • Author(s): Rajib Saha, Rintaro Ueji and Nobuhiro Tsuji
  • Journal Title: Scripta Mater Volume: Vol.68, Issue 10 Pages: 813-816
  • DOI: 10.1016/j.scriptamat.2013.01.038
• [Presentation] Optimizing Strength and Ductility in Cu-Al Alloy with Fine and Homogeneous Recrystallized Structure by Simple Cold Rolling and Annealing (2014)
  • Author(s): Yanzhong Tian, Daisuke Terada, Akinobu Shibata, Nobuhiro Tsuji
  • Organizer: TMS Annual Meeting & Exhibition 2014
  • Place of Presentation: San Diego, USA
  • Year and Date: 20140216-20140220
• [Presentation] Fully Recrystallized Nanostructures in Steels (2013)
  • Author(s): Nobuhiro Tsuji, Rajib Saha, Rintaro Ueji, Yanzhong Tian, Shuai Chen, Daisuke Terada and Akinobu Shibata
  • Organizer: European Congress and Exhibition on Advanced Materials and Processes (EUROMAT 2013)
  • Place of Presentation: Sevilla, Spain
  • Year and Date: 20130908-20130913
• [Presentation] Nanocrystalline Austenite in Fe-24Ni-0.3C Alloy Fabricated by High Pressure Torsion and Subsequent Heat Treatment (2013)
  • Author(s): Shuai Chen, Akinobu Shibata and Nobuhiro Tsuji
  • Organizer: European Congress and Exhibition on Advanced Materials and Processes (EUROMAT 2013)
  • Place of Presentation: Sevilla, Spain
  • Year and Date: 20130908-20130913
• [Presentation] Nanocrystalline TWIP Steel with Superior Mechanical Properties Fabricated by Cold Rolling and Annealing (2013)
  • Author(s): Rajib Saha, Rintaro Ueji and Nobuhiro Tsuji
  • Organizer: 5th International Conference on Recrystallization & Grain Growth
  • Place of Presentation: Sydney, Australia
  • Year and Date: 20130505-20130510
• [Presentation] Optimizing Strength and Ductility in Cu-Al Alloy with Fine Homogeneous Recrystallized Structures by Simple Cold Rolling and Annealing (2013)
  • Author(s): Y.Tian, D.Terada, A.Shibata and N.Tsuji
  • Organizer: 日本金属学会秋期講演大会
  • Place of Presentation: 金沢大学
  • Year and Date: 2013-09-17