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Influence of La2O3 content on the microstructure and properties of Ni/Al composites fabricated by friction stir processing
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National Defence Key Discipline Laboratory of Light Alloy Processing Science and Techonology,Nachang Hangkong University

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TB331

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    Abstract:

    : (Ni+La2O3)/Al composites were fabricated by means of adding the mixed powder of (Ni+La2O3) with different La2O3 content to the Al substrate in the Friction Stir Processing (FSP) period. The microstructures of the composite zone were analyzed by SEM and EDS, the element distribution of the composite zone were analyzed by EPMA, the phase composition was examined by XRD, the mechanical properties of the composites were tested by tensile test at room temperature. Results show that: The microstructure and properties of (Ni+La2O3)/Al composites trend to be better firstly and then worse with increasing of La2O3 contents. When the contents of La2O3 are 5%, the contents of Al3Ni particles increase and the distribution of particles becomes uniform,the massive Ni agglomerates are decreased, so the tensile strength of the composites is the highest with 215MPa, which is increased by 22% than that of Ni/Al composites(The tensile strength is 176MPa); When the contents of La2O3 are 7%, the contents of Al3Ni particles decrease and the massive Ni agglomerates reappear, the tensile strength of the composites decreased to 201MPa.

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[Wang Yunhai, Xia Chun, Huang Chunping, Liu Fencheng, Ke Liming. Influence of La2O3 content on the microstructure and properties of Ni/Al composites fabricated by friction stir processing[J]. Rare Metal Materials and Engineering,2018,47(12):3829~3834.]
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History
  • Received:March 21,2017
  • Revised:September 11,2017
  • Adopted:September 29,2017
  • Online: January 04,2019
  • Published: