DVRC 분석에 의한 A1-고농도 Mg (7 ~ 11 wt%) 합금의 석출분해 과정의 해석 = Analysis of Precipitation Decomposition Process of A1-High Mg (7 ~ 11 wt%) Alloys by the DVRC Investigation

다국어 초록 (Multilingual Abstract)

Utilizing electrical resistivity measurements during heating, precipitation behaviors of high Mg contented Al-Mg alloys, which is currently spotlighted as automotive sheet material, has been analyzed. In the attempt to analyze precipitation behavior in detail, electrical resistivity change ratio was differentiated by temperature and acquired DVRC (Differentiation values of electrical resistivity changes). By measuring DVRC during heating, more precise analysis was possible than conventional electrical resistivity measurement. The transformation process of precursor phase, such as G. P. zone, shown as positive peaks at low temperature region in DVRC, was accelerated by higher solid solution treatment temperature. This reaction was identified as being activated by excessive vacancy concentration. With increased heating rate and Mg addition, splitting of DVRC peaks in low and high temperature was observed. This indicates that in high Mg concentrated Al-Mg alloy various precipitation processes highly depend on heating rate and Mg concentration.

목차 (Table of Contents)

• 1. 서론
• 2. 실험 방법
• 합금제조 및 열처리
• 전기비저항의 측정
• 미세조직관찰
• 3. 실험 결과 및 고찰
• 승온시의 전기저항 변화
• 승온시의 DVRC 변화
• G. P. zone의 분해 활성화 에너지와 β'과 β의 석출 활성화 에너지
• 4. 결론