발간논문

Home > KJMM 논문 > 발간논문

Vol.28, No.9, 796 ~ 802, 1990
Title
A Study on the Precipitation Behavior in Rapidly Solidified Al - Li - Zr Ternary Alloys
정해용Hae Young Jeong, 윤재성Jae Seong Yoon, 박세윤Se Yun Park, 김인배In Bae Kim
Abstract
The precipitation behavior of rapidly solidified Al-Li-Zr alloys has been investigated after melt quenching and after subsequent aging at temperatures ranging from 160 to 240℃, by using a transmission electron microscopy and microhardness measurements. Metastable δ` and β` phases which are nearly spherical in shape are present in the as quenched condition. Composite precipitates are controlled by diffusion of Li atoms onto the initial morphology of β` phase. Heterogeneous precipitations are interpreted in terms of a combination of excess vacancies and capillarity effects on the particle stability at elevated temperatures. Precipitate free zone(PFZ) occurred by heterogeneous precipitation of δ phase formed perferentially at grain boundaries. The width of PFZ increased with (aging time)^½. From the analysis of the growth kinetics of PFZ, diffusivity was obtained to be 1.028×10^(-15)㎝/s at 240℃.
Key Words
| PDF
대한금속∙재료학회 │ (06633) 서울시 서초구 서초대로 56길 38 대한금속∙재료학회 회관 (서초1동 1666-12번지)
Tel : 070-4266-1646 │ FAX : 02-557-1080 │ E-mail : metal@kim.or.kr
Copyright ⓒ 2013 사단법인 대한금속∙재료학회 All rights reserved.