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交變電流對原位合成Al基復合材料的組織及性能影響
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1.西安熱工研究院有限公司;2.西安建筑科技大學陜西省納米材料與技術重點實驗室

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陜西省教育廳重點實驗室項目(18JS060); 華能集團科技項目(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

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陜西省教育廳重點實驗室項目(18JS060); 華能集團科技項目(HNKJ18-H45 HTR-PM)

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    摘要:

    本研究選用直徑200μm的Ti纖維作為反應源,99.6wt.%的純鋁作為基體,并在預制體制備階段將反應源等間距固定在基體中,以對生成物的初生位置進行預調控。隨后將預制體置于感應加熱爐內,施加等梯度變化的交變電流促進Al-Ti間原位反應,以期獲得Al3Ti顆粒增強鋁基復合材料。通過XRD、SEM及磨損測試對不同電流下復合材料的物相組成、顯微組織和耐磨性能進行表征。結果表明:電流15A時,Ti纖維完全反應,產物為等軸狀Al3Ti,尺寸為1-2μm,顆粒間距約5μm,達所有參數下的最優(yōu)值。載荷10N下,15A時復合材料的耐磨性能最佳,摩擦系數、磨損量分別為最小值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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閆俞廷,馬俊,楊蕾.交變電流對原位合成Al基復合材料的組織及性能影響[J].稀有金屬材料與工程,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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  • 收稿日期:2020-09-15
  • 最后修改日期:2020-12-08
  • 錄用日期:2020-12-22
  • 在線發(fā)布日期: 2022-04-06
  • 出版日期: 2022-03-30