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Al-4.0%Zn-1.5%Mg-0.9%Cu 합금의 압출, 압연 및 열처리에 따른 미세조직 변화
권혁곤,박종문,오명훈,박노진 한국열처리공학회 2018 熱處理工學會誌 Vol.31 No.2
In this study, microstructural changes due to extrusion, rolling and heat treatment were studied to fabricate Al-4.0wt%Zn-1.5wt%Mg-0.9wt%Cu alloys with homogeneous microstructure suitable for metal cases of smart phones and electronic products fabricated through plastic working. After extrusion microstructure and texture were developed very differently on the surface and inside. Inside, coarse grains were formed and a strong Cube component orientation was developed. On the surface, a weak texture was developed with small grains. After 72% cold rolling the intensity of the Cube component orientation was lower, and uniform texture was developed in all the layers and the R-value was uniformly predicted. After recrystallization, the grain size difference between at the surface and the inside is smaller, when 72% rolling was performed, indicating that a uniform structure is formed. Texture develops almost randomly after recrystallization and exhibits uniform R-values at all layers.
Ti-X계 합금의 분말야금 공정 차이에 따른 미세조직변화 분석
권혁곤 ( Hyeok-gon Kwon ),김두현 ( Doo-hyeon Kim ),강민 ( Min Gang ),박지환 ( Ji-hwan Park ),오명훈 ( Myung-hoon Oh ) 한국열처리공학회 2021 熱處理工學會誌 Vol.34 No.1
In this study, Ti-X (X=Mn, Fe, Mo) powder alloys were designed and manufactured by both powder metallurgy (PM) and metal powder injection molding (MIM) process to improve strength and formability compared to CP-Ti powder materials. It was found that the lamellar microstructure consisted of α and β phases was formed in PM-processed alloys. However, MIM-processed alloys showed not the lamellar microstucture but the equiaxed α + β microstructure. It was also revealed that the contents of X component and feedstock were not affected to microstructure evolution. The reason why different microstructure was appeared between PM-processed and MIM-processed alloys is not clear yet, but supposed to be the effect of intersticial elements such as C, H and N derived from feedstock during debinding process of MIM. (Received January 15, 2021; Revised January 19, 2021; Accepted January 22, 2021)