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Journal of Materials Science

, Volume 30, Issue 14, pp 3680–3689 | Cite as

The structure of a rapidly solidified Al-Fe-Ti-C alloy

  • X. C. Tong
  • N. F. Shen
  • B. C. Liu
Papers

Abstract

The microstructures of melt-spun Al-2.03 Fe-0.46 Ti-0.35 C (at %) superheated to 1523 K (ribbon I), and 1673 K (ribbon II), respectively, before quenching, have been characterized using analytical electron microscopy and X-ray diffraction. A duplex microstructure has been observed for ribbon I, consisting of a microcellular region, across a sharp transition, followed by a coarser cellular or dendritic structure. The intercellular phases consisted mostly of Al6Fe (few of Al3Fe) and the dispersed TiC particles distributed in the α-Al matrix with an exact orientation relationship. However, the microstructure of ribbon II comprised uniform, fine-scale dispersions of Al6Fe phase in α-Al grains, and larger size, elongated amorphous phase particles located along the grain boundaries, and approximately 0.46 at % Ti and 0.35 at % C dissolved in the α-Al matrix. During the annealing of ribbon II, the amorphous phase transformed to αT-AlFeSi phase, the Al6Fe dispersoids grew upwards and Al3Fe, TiC particles precipitated in the α-Al matrix. TiC phase formed both in ribbon I and in annealed ribbon II all had an atomic composition of TiC0.79 (the nominal atomic percent ratio for the alloy \(X_C /X_{T_{_j } } \) was 0.74) and a lattice parameter of 0.424 nm. Moreover, there is a cube-cube orientation relationship between TiC and α-Al matrix with a disregistry δ=0.049. In addition, the solidification characteristics of rapid solidification processing (RSP) Al-Fe-Ti-C alloy and mechanism of TiC formation have been discussed.

Keywords

Amorphous Phase Orientation Relationship Al3Fe Atomic Composition Analytical Electron 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Chapman & Hall 1995

Authors and Affiliations

  • X. C. Tong
    • 1
  • N. F. Shen
    • 1
  • B. C. Liu
    • 2
  1. 1.Research Centre for MaterialsZhengzhou Institute of TechnologyZhengzhouPeople’s Republic of China
  2. 2.Department of Mechanical EngineeringTsinghua UniversityBeijingPeople’s Republic of China

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