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Effect of alternating current on the structure and properties of in-situ synthesized Al matrix composites
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1.Xi’an Thermal Power Research Institute Co.,Ltd;2.Shaanxi Key Laboratory of Nanomaterials and Technology, Xi´an University of Architecture and Technology

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陕西省教育厅重点实验室项目(18JS060); 华能集团科技项目(HNKJ18-H45 HTR-PM)

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    Abstract:

    In the present work, Ti fiber with a diameter of 200μm was used as the reaction source, and pure aluminum with a purity of 99.6wt.% was used as the matrix. The reaction source was fixed in the matrix at equal intervals during the preparation of the preform to pre-control the initial position of the product. Subsequently, the preform was placed in the induction heating furnace, and at the same time, the constant gradient alternating current were applied to promote the in-situ reaction between Al-Ti, in order to obtain Al3Ti particle-reinforced aluminum matrix composite material. The phase composition, microstructure and wear resistance of the composite material under different currents were characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM) and wear testers. The results show that when the current is 15A, the Ti fiber is completely reacted, and the product is the isometric Al3Ti with a size of 1-2μm and a particle spacing of about 5μm, reaching the optimal value under all parameters. Under the condition of a load of 10N, the wear resistance of the composite is the best at 15A, and the friction coefficient and wear amount are the lowest values of 0.1 and 2.031mg/mm2 respectively.

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[yanyuting, Ma Jun, Yang Lei. Effect of alternating current on the structure and properties of in-situ synthesized Al matrix composites[J]. Rare Metal Materials and Engineering,2022,51(3):1055~1062.]
DOI:10.12442/j. issn.1002-185X.20200708

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History
  • Received:September 15,2020
  • Revised:December 08,2020
  • Adopted:December 22,2020
  • Online: April 06,2022
  • Published: March 30,2022