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交变电流对原位合成Al基复合材料的组织及性能影响
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1.西安热工研究院有限公司;2.西安建筑科技大学陕西省纳米材料与技术重点实验室

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基金项目:

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)


Effect of alternating current on the structure and properties of in-situ synthesized Al matrix composites
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Affiliation:

1.Xi’an Thermal Power Research Institute Co.,Ltd;2.Shaanxi Key Laboratory of Nanomaterials and Technology, Xi´an University of Architecture and Technology

Fund Project:

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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    摘要:

    本研究选用直径200μm的Ti纤维作为反应源,99.6wt.%的纯铝作为基体,并在预制体制备阶段将反应源等间距固定在基体中,以对生成物的初生位置进行预调控。随后将预制体置于感应加热炉内,施加等梯度变化的交变电流促进Al-Ti间原位反应,以期获得Al3Ti颗粒增强铝基复合材料。通过XRD、SEM及磨损测试对不同电流下复合材料的物相组成、显微组织和耐磨性能进行表征。结果表明:电流15A时,Ti纤维完全反应,产物为等轴状Al3Ti,尺寸为1-2μm,颗粒间距约5μm,达所有参数下的最优值。载荷10N下,15A时复合材料的耐磨性能最佳,摩擦系数、磨损量分别为最小值0.1、2.031mg/mm2。

    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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闫俞廷,马俊,杨蕾.交变电流对原位合成Al基复合材料的组织及性能影响[J].稀有金属材料与工程,2022,51(3):1055~1062.[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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历史
  • 收稿日期:2020-09-15
  • 最后修改日期:2020-12-08
  • 录用日期:2020-12-22
  • 在线发布日期: 2022-04-06
  • 出版日期: 2022-03-30