Development of high-strength Al alloy with high thermal stability by multi-directionally forging

2018 Fiscal Year Final Research Report

• Project/Area Number: 17K17810
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Materials/Mechanics of materials; Material processing/Microstructural control engineering
• Research Institution: Toyohashi University of Technology
• Principal Investigator: Aoba Tomoya 豊橋技術科学大学, 工学(系)研究科(研究院), 助教 (50757143)
• Project Period (FY): 2017-04-01 – 2019-03-31
• Keywords: アルミニウム合金 / 組織制御 / 多軸鍛造法 / 結晶粒微細化 / 析出

Outline of Final Research Achievements

This study investigated the grain refinement and thermal stability of aluminum alloy during multi-directional forging. The grain size of multi-directionally forged (MDFed) Al-Mg-Sc alloy up to cumulative strains of Σσ=6 was smaller than that of MDFed Al-Mg alloy due to dense shear banding. MDFed Al-Mg alloy was softened immediately by annealing for several hours, but the Al-Mg-Sc alloy maintained high hardness even after three months of annealing.

Free Research Field

材料工学

Academic Significance and Societal Importance of the Research Achievements

本研究は、時効硬化性のあるアルミニウム合金に対して巨大ひずみ加工法の一種である多軸鍛造法を施した後、焼鈍処理を行った。巨大ひずみ加工後のアルミニウム合金の析出挙動に関しては未解明な部分が多く、これに関して知見を得ることで、実用的な高強度合金設計に関する指針を作成するための一助となる。