Fatigue crack retardation by deformation twin in magnesium alloy

• Project/Area Number: 26820318
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Structural/Functional materials
• Research Institution: Saga University
• Principal Investigator: Morita Shigeki 佐賀大学, 工学(系)研究科(研究院), 准教授 (00314089)
• Project Period (FY): 2014-04-01 – 2016-03-31
• Project Status: Completed (Fiscal Year 2015)
• Budget Amount: ¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000); Fiscal Year 2015: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2014: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
• Keywords: マグネシウム合金 / 変形双晶 / 集合組織 / 結晶粒径 / 疲労き裂 / マグネシウム

Outline of Final Research Achievements

The fatigue crack propagation behavior of pre-tension rolled and pre-compression extruded textured polycrystalline magnesium alloys were investigated. The pre-introduced deformation twins existing at a crack tip does not influence the fatigue crack propagation rate. There is the optimal volume of deformation twin. Finally, the fatigue crack does not propagate at the interface of deformation twins and/or deformation twin and matrix.

Research Products

• [Journal Article] Microstructure dependence of fatigue crack propagation behavior in wrought magnesium alloy (2016)
  • Author(s): S. Morita, S. Fujiwara, T. Hori, N. Hattori, H. Somekawa, T. Mayama
  • Journal Title: Fracture and Structural Integrity Volume: 35 Issue: 35 Pages: 82-87
  • DOI: 10.3221/igf-esis.35.10
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Presentation] AZ31Mg合金圧延材におけるミクロ組織変化の負荷方向依存性 (2016)
  • Author(s): 一ノ瀬彩実, 森田繁樹, 服部信祐, 眞山剛
  • Organizer: 日本機械学会九州学生会 第47回卒業研究発表講演会
  • Place of Presentation: 鹿児島高等専門学校
  • Year and Date: 2016-03-04
• [Presentation] AZ31Mg合金圧延材の疲労寿命に及ぼす負荷開始方向の影響 (2016)
  • Author(s): 坂口尚希, 池田亮太, 森田繁樹, 眞山剛, 服部信祐
  • Organizer: 日本機械学会九州学生会 第47回卒業研究発表講演会
  • Place of Presentation: 鹿児島高等専門学校
  • Year and Date: 2016-03-04
• [Presentation] 高応力振幅下における多結晶Mg 合金の疲労特性異方性 (2016)
  • Author(s): 森田繁樹
  • Organizer: 第60回高性能Mg合金創成加工研究会
  • Place of Presentation: 熊本大学
  • Year and Date: 2016-01-18
• [Presentation] AZ31マグネシウム合金圧延材における引張および圧縮変形中のミクロ組織変化 (2015)
  • Author(s): 森田繁樹, 森彩奈, 眞山剛, 服部信祐
  • Organizer: 日本機械学会 M& M2015材料力学カンファレンス
  • Place of Presentation: 慶應義塾大学
  • Year and Date: 2015-11-23
• [Presentation] AZ31マグネシウム合金押出板材の疲労き裂進展挙動 (2015)
  • Author(s): 田河博康, 岡本悠司, 森田繁樹, 染川英俊, 眞山剛, 服部信祐
  • Organizer: 軽金属学会第129回秋期大会
  • Place of Presentation: 日本大学
  • Year and Date: 2015-11-21
• [Presentation] Microstructure dependence of fatigue crack propagation behavior in wrought magnesium alloy (2015)
  • Author(s): S. Morita, S. Fujiwara, T. Hori, N. Hattori, H. Somekawa, T. Mayama
  • Organizer: The 5th International Conference on Crack Paths (CP2015)
  • Place of Presentation: Ferrara, Italy
  • Year and Date: 2015-09-16
• [Presentation] Influence of pre-strain on fatigue crack growth behavior in rolled AZ31 magnesium alloy (2015)
  • Author(s): R. Momoe, S. Morita, T. Mayama, N. Hattori
  • Organizer: 12th International Conference on the Mechanical Behavior of Materials (ICM12)
  • Place of Presentation: Karlsruhe, Germany
  • Year and Date: 2015-05-11
• [Presentation] Anisotropy of cyclic deforrmation and fatigue properties in rolled AZ31 magnesium alloy (2015)
  • Author(s): S. Morita, R. Ikeda, T. Mayama, N. Hattori
  • Organizer: 12th International Conference on the Mechanical Behavior of Materials (ICM12)
  • Place of Presentation: Karlsruhe, Germany
  • Year and Date: 2015-05-11
• [Presentation] Fatigue properties of fine-grained AZ31 magnesium alloy (2015)
  • Author(s): Y. Okamoto, T. Hori, S. Morita, H. Somekawa, T. Mayama, N. Hattori
  • Organizer: 12th International Conference on the Mechanical Behavior of Materials (ICM12)
  • Place of Presentation: Karlsruhe, Germany
  • Year and Date: 2015-05-11
• [Presentation] マグネシウム合金展伸材の擬弾性挙動に及ぼす結晶粒径および集合組織の影響 (2014)
  • Author(s): 森田繁樹
  • Organizer: 第55回高性能Mg合金創成加工研究会「マグネシウムの弾性変形と塑性変形」
  • Place of Presentation: 熊本大学
  • Year and Date: 2014-12-04
  • Invited
• [Presentation] Z31マグネシウム合金圧延材の疲労き裂進展挙動に及ぼす板厚方向の引張予ひずみの影響 (2014)
  • Author(s): 百枝亮一, 森田繁樹, 眞山剛, 服部信祐
  • Organizer: 軽金属学会第127回秋期大会
  • Place of Presentation: 東京工業大学
  • Year and Date: 2014-11-15 – 2014-11-16
• [Presentation] AZ31マグネシウム合金圧延材の疲労特性に及ぼす試験片採取方向の影響 (2014)
  • Author(s): 池田亮太, 森田繁樹, 眞山剛, 服部信祐
  • Organizer: 軽金属学会第127回秋期大会
  • Place of Presentation: 東京工業大学
  • Year and Date: 2014-11-15 – 2014-11-16
• [Presentation] 粗大粒AZ31マグネシウム合金押出材の疲労き裂進展挙動に及ぼす応力比の影響 (2014)
  • Author(s): 藤原誠也, 森田繁樹, 眞山剛, 服部信祐
  • Organizer: 軽金属学会第127回秋期大会
  • Place of Presentation: 東京工業大学
  • Year and Date: 2014-11-15 – 2014-11-16
• [Presentation] AZ31マグネシウム合金押出板材の疲労き裂進展挙動に及ぼす結晶粒径の影響 (2014)
  • Author(s): 堀爵仁, 岡本悠司, 森田繁樹, 染川英俊, 眞山剛, 服部信祐
  • Organizer: 軽金属学会第127回秋期大会
  • Place of Presentation: 東京工業大学
  • Year and Date: 2014-11-15 – 2014-11-16
• [Presentation] AZ３１マグネシウム合金圧延材の繰返し変形挙動に及ぼす試験片採取方向の影響 (2014)
  • Author(s): 森田繁樹，森彩名，藤原誠也，眞山剛，服部信祐
  • Organizer: 日本機械学会 M& M2014材料力学カンファレンス
  • Place of Presentation: 福島大学
  • Year and Date: 2014-07-19 – 2014-07-21
• [Remarks] 佐賀大学 理工学部 機械システム工学科 先端材料システム学講座
  • URL: http://www.me.saga-u.ac.jp/sentan/index.html