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Solidification behaviour and the effects of cerium on the intermetallic structure of an novel Al–Cu–Li alloy
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School of Materials Science and Engineering,Central South University,Central South University; Yantai Nanshan University,School of Materials Science and Engineering,Central South University,School of Materials Science and Engineering,Central South University,School of Materials Science and Engineering,Central South University

Fund Project:

Research Foundation of the General Armament Department(6140506); Foundation for Sci & Tech Development Project of Sandong (No. 2014GGX102006)

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    Abstract:

    In the present work, the microstructure evolution of a novel Al-Cu-Li alloy with rare earth cerium (Ce) additions (0, 0.1, 0.3, and 0.5 wt.%) were investigated. The as-cast samples were characterized by optical microscopy (OM), scanning electron microscopy (SEM), X-ray diffraction (XRD) and electron probe microanalysis (EPMA) with wavelength dispersive spectroscopic (WDS). The microstructural observation showed that the grains were significantly refined with increasing the addition contents of rare earth Ce. A Mg Ag-rich Al7Cu4Li intermetallic phase was observed in all experimental alloys except for the alloy with addition of 0.5wt.? that may be attributed to emerged an extra gray CuSi(AgMg) phase. Furthermore, the coarse rodlike Al2CuLi phase was completely absent with Ce level up to 0.3wt.%. The analysis shows that the Ce addition introduces changes in the precipitation sequence and consequently in the solidification behavior of the alloy. It can be deduced that the grain refinement is mainly the result of the primary Al8Cu4Ce promoting a (Al) nucleation and further prohibiting the grain growth for the cerium addition experimental alloys.

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[Yu Xinxiang, Yin Dengfeng, Yu Zhiming, Zhang Yiran, Li Shufei. Solidification behaviour and the effects of cerium on the intermetallic structure of an novel Al–Cu–Li alloy[J]. Rare Metal Materials and Engineering,2016,45(6):1423~1429.]
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History
  • Received:January 08,2015
  • Revised:February 06,2015
  • Adopted:May 13,2015
  • Online: October 08,2016