Synthesis of nano-bubble dispersion strengthened (BDS) alloys by organic-inorganic combination and elucidation of its strength mechanism

2014 Fiscal Year Final Research Report

• Project/Area Number: 24656425
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Material processing/treatments
• Research Institution: Hokkaido University
• Principal Investigator: UKAI Shigeharu 北海道大学, 工学(系)研究科(研究院), 教授 (00421529)
• Co-Investigator(Kenkyū-buntansha): ABE Yosuke 国立研究開発法人日本原子力研究開発機構, 研究員 (50400403)
• Co-Investigator(Renkei-kenkyūsha): OONO Naoko 北海道大学, 大学院工学研究院, 助教 (40512489)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: ナノプロセス / ナノバブル / 転位

Outline of Final Research Achievements

Nano bubbles in the size less than 10 nm have been successfully synthesized in copper metal by means of dissociated gases of organic PMMA powder. From the macroscopic hardness measurement of the nano-bubble dispersed copper (BDS-Cu) as well as direct measurement of bow-out angle of the moving dislocation on the bubble by in-situ TEM tensile test, an interaction strength between nano-bubble and dislocation was evaluated. The dislocation-bubble elastic interaction energy and stacking fault width were found to affect those interaction strength. MD simulation analyses provided information on a critical stress when an edge dislocation passes through bubbles, by replacing the dissociated gases with helium.

Free Research Field

材料工学