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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2019.1
- 수록면
- 697 - 704 (8page)
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초록· 키워드
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Microstructure evolution of a new high-alloyed Al–Zn–Mg–Cu–Zr–Sc aluminium alloy during two-stage homogenizationprocess was investigated by use of scanning electron microscope, transition electron microscope and high resolution transitionelectron microscope. The results indicate that the morphology and chemical composition of Al 3 (Sc, Zr) particles formedin the fi rst stage were greatly aff ected by heating temperature. With the increase of heating temperature, the morphologyof Al 3 (Sc, Zr) particles transform from cuboidal with evident faceting to spheroidal due to improved Zr diff usivity. MoreZr atoms enrich in the interface of precipitate/matrix forming a thin layer. Moreover, the mean diameter of precipitatesincreases a little bit with the increase of heating temperature, showing very restricted coarsening rate and high thermal stabilityof Al 3 (Sc, Zr) particles. After an appropriate second stage heat treatment (474 °C × 48 h), the intermetallic formed inthe solidifi cation process could dissolve suffi ciently and Al 3 (Sc, Zr) particles still keep very good coherency with Al matrixwithout abnormal growth.
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