# 기계적 합금화법에 의해 제조된 Al+Al3Ti합금 및 Al+10wt.%Ti합금의 고용현상

• Kim, Hye-Sung (Dept. of Materials Science and Engineering, Chung-nam National University) ;
• Lee, Jung-Ill (Dept. of Materials Science and Engineering, Chung-ju National University) ;
• Kim, Gyeung-Ho (Division of Metals, korea Institute of Science and Technology) ;
• Kum, Dong-Wha (Division of Metals, korea Institute of Science and Technology) ;
• Shur, Dong-Soo (Dept. of Materials Science and Engineering, Chung-nam National University)
• 김혜성 (충남대학교 재료공학과) ;
• 이정일 (충주산업대학교 재료공학과) ;
• 김긍호 (한국과학기술연구원 금속연구부) ;
• 금동화 (한국과학기술연구원 금속연구부) ;
• 서동수 (충남대학교 재료공학과)
• Published : 1996.06.30

#### Abstract

The solubility of Ti in Al matrix was determined by X-ray diffraction method on two different mechanical alloying systems, i.e Al+$Al_3Ti$ and Al+Ti alloys. Starting powder compositions of two systems were chosen for final volume fraction of $Al_3Ti$ phase being 25%. The solubility of Ti in ${\alpha}$-Al was estimated by the lattice parameter measurement of Al. For Al+$Al_3Ti$ mixture, it appeared that some of $Al_3Ti$ particles decomposed during milling and maximum solubility of Ti in Al was about 0.99%. The majority of $Al_3Ti$ particles were dispersed uniformly in Al matrix, having approximate size of 100~200 nm. On the other hand, higher Ti solubility of 1.24 wt.% was found in Al+Ti system, with starting composition of Al+10 wt.%Ti. After 15 hours of milling, Ti phase was identified as 20 nm sized particles embedded in Al matrix. The annealing of mechanically alloyed powders from Al+$Al_3Ti$ and Al+10 wt.%Ti systems was followed in the temperature range of 200 to $600^{\circ}C$ to study thermal stability of supersaturated solution of Al(Ti). After annealing, the lattice parameter of Al reverted back to that of pure Al, and the peak intensity ratio of $Al_3Ti$/Al was increased more than the original value before annealing. These results suggest that Ti dissolve into alpha-Al solutions during milling, and by annealing, $Do_{22}-Al_3Ti$ phase forms from Al(Ti) solution.