비대칭압연이 시효처리된 Al-Mg-Si 합금의 기계적 특성과 성형성에 미치는 영향

다국어 초록 (Multilingual Abstract)

Al-Mg-Si alloy was rolled asymmetrically at several temperatures to apply shear deformation, and the effects of the initial precipitate on shear deformation, texture evolution, formability, and plastic anisotropy were studied. Texture was analyzed using a EBSD, and the formability and plastic anisotropy of the specimen were evaluated using the value and value calculated from the plastic strain ratio (r-value) which was determined from the change in the length of the specimen during tensile deformation. Asymmetric rolling
induces a larger equivalent strain than symmetric rolling, and the equivalent strain increases as the asymmetric rolling temperature increases. When a specimen with peak-aged initial precipitates was
asymmetrically rolled, less shear deformation occurred at room temperature than in a solution-treated specimen without initial precipitates. In contrast, a larger shear deformation occurred at high temperatures (500℃). With asymmetric rolling at room temperature, the specimens without initial precipitates had higher formability and lower plasticity, while for asymmetric rolling at high temperature, the specimens with initial precipitates had higher formability and lower plastic anisotropy. This is due to the <111>//ND texture, such
as {111}<110> and {111}<112> orientation that has similar and high r-values at 0°, 45°, and 90° to the rolling direction, developed by the shear deformation that occurred during asymmetric rolling.

목차 (Table of Contents)

• 목차
• 1. 서론 ··············································································· 5
• 1. 실험방법
• 2.1 6061 알루미늄 합금 ······················································ 9
• 2.2 비대칭 압연 (Asymmetric rolling) ······························· 11
• 2.3 등가변형률(Ɛeq) 계산 ··················································· 13
• 2.4 미세조직 분석 ···························································· 14
• 2.5 기계적 특성 분석 ······················································· 14
• 2.6 집합조직 분석 ···························································· 15
• 2.7 성형성과 소성이방성 분석 ·········································· 16
• 2. 결과 및 고찰
• 3.1 등가변형률 계산 ························································· 20
• 3.2 미세조직 ···································································· 23
• 3.3 경도변화 ···································································· 28
• 3.4 집합조직 ···································································· 30
• 3.5 성형성과 이방성 ························································· 36
• 2. 결론
• 3. 참고문헌
• ABSTRACT