Cu-Co 합금의 불연속석출에 미치는 시효와 소성변형의 영향 = The Effects of Aging and Plastic Deformation on the Discontinous Precipitation in Cu-Co Alloys

다국어 초록 (Multilingual Abstract)

The effects of aging and plastic deformation on the discontinuous precipitation in Cu-2.5% Co alloy were investigated. Specimens were prepared by melting of high-purity electrolytic copper and cobalt powders at 1250℃ for 24 hours in hydrogen atmosphere. Ingot was homogenized at 1050℃ for 48 hours. Cold-rolled plate specimens were solution-treated and water-quenched. Subsequently, isothermal aging was carried out at various temperatures. The longer the aging time, the more discontinuous precipitation occurred. Although it was more pronounced at higher temperature, the amount of discontinuous precipitation was rather diminished at 800℃. The specimens cooled slowly from solution treatment temperature to aging temperature then isothermally aged, showed no discontinuous precipitation. On the other hand, slightly deformed specimens showed strain-induced grain bondary migration and subsequent discontinuous precipitation. The driving force for the discontinuous precipitation was discussed.

목차 (Table of Contents)

• Ⅰ. 서론
• Ⅱ. 실험방법
• 1. 시료 준비
• 2. 등온시효 및 서냉
• 3. 소성변형
• 4. 미세조직관찰
• Ⅲ. 실험결과 및 고찰
• 1. 등온시효에 의한 불연속석출
• 2. 서냉에 의한 입계석출
• 3. 변형유기입계이동과 불연속석출에 대한 소성변형의 영향
• 4. 불연속석출의 구동력
• Ⅳ. 결론
• Ⅴ. 참고문헌