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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2011.1
- 수록면
- 347 - 353 (7page)
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초록· 키워드
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There is thixo-extrusion to form high strength aluminum alloy. But, it is a problem that grains become grain coarsening during reheating process because the alloy was exposed at high temperature. In order to solve grain growth during reheating process, calcium was added in Al-Zn-Mg alloys. Primary a grain sizes of semi-solid Al-Zn-Mg-(0, 0.4, 0.6 and 0.9, wt.%)Ca were measured with image analyzer after reheating. Measured primary a grain sizes were applied to LSW(Lifshitz-Slyozov and Wagner) equation to check the effect of Ca on grain coarsening. Coarsening rate constant K values of semi-solid Al-Zn-Mg-(0, 0.4, 0.6 and 0.9, wt.%)Ca alloys were $371\;mm^3s^{-1}$, $247\;mm^3s^{-1}$, $198\;mm^3s^{-1}$ and $166 mm^3s^{-1}$, respectively. As increasing calcium content, K value decreased which means grains are refined. Also, grains of calcium addition were more spherical than that of calcium free.
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참고문헌 (32)
참고문헌 신청
ASM International / 1990 / Properties and Selection: Nonferrous Alloys and Special-Purpose Materials (10th Ed.), 2 / ASM International :142~143
M.C. Flemings / 1991 / Behavior of Metal Alloys in the Semisolid State / Metall. Trans 22:957~981
Z. Fan / 2002 / Semisolid metal processing / Int. Mater. Rev 47:49~85
M. Kiuchi / 2002 / Mushy / Semi-Solid Metal Forming Technology - Present and Future / Ann. CIRP 51:653~670
Y.O. Yoon / 2006 / Effect of thixoextrusion parameters on mechanical properties of 7003 Aluminum wrought alloy / RARE METALS 25:124~128
M.C. Flemings / 1991 / Behavior of Metal Alloys in the Semisolid State / Metall. Trans 22:957~981
Z. Fan / 2002 / Semisolid metal processing / Int. Mater. Rev 47:49~85
M. Kiuchi / 2002 / Mushy / Semi-Solid Metal Forming Technology - Present and Future / Ann. CIRP 51:653~670
Y.O. Yoon / 2006 / Effect of thixoextrusion parameters on mechanical properties of 7003 Aluminum wrought alloy / RARE METALS 25:124~128
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