12Mg17及少量的AlCu4、AlMg和Mg2Si、AlMg及少量的β-Al12Mg17組成。攪拌摩擦加工改性層與鎂合金基體結(jié)合良好,表面平整光滑、組織均勻細小。與鎂合金基體相比,表面改性層的顯微硬度和耐腐蝕性能均得到明顯提高,經(jīng)攪拌摩擦加工之后的添加Si Al混合粉末改性層的顯微硬度值最高可達296 HV,比母材提高了385.3%；添加Cu Al混合粉末改性層的自腐蝕電位最高可達-0.975 V,比母材也提高了37.4%。"/>

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AZ31B鎂合金表面激光熔敷 攪拌摩擦加工改性層結(jié)構(gòu)與性能研究
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榆林學(xué)院能源工程學(xué)院,太原理工大學(xué)材料科學(xué)與工程學(xué)院,榆林學(xué)院能源工程學(xué)院

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陜西省科技廳工業(yè)科技攻關(guān)項目(2015GY167)和榆林市科技局產(chǎn)學(xué)研資助項目(2014cxy-05-1)


Investigation on the Microstructure and Properties of AZ31B Magnesium Alloys Modified Layers by Laser Cladding Friction Stir Processing
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Yulin University,Taiyuan University of Technology,Yulin University

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    摘要:

    采用激光熔敷和攪拌摩擦加工技術(shù)相結(jié)合的方法對AZ31B鎂合金表面分別制備了Cu Al和Si Al改性層。通過SEM、XRD、顯微硬度以及電化學(xué)腐蝕測試系統(tǒng)對表面改性層的微觀組織、相組成及耐腐蝕等性能進行分析測試。用Cu Al和Si Al粉末分別制備的改性層化合物主要由β-Al12Mg17及少量的AlCu4、AlMg和Mg2Si、AlMg及少量的β-Al12Mg17組成。攪拌摩擦加工改性層與鎂合金基體結(jié)合良好,表面平整光滑、組織均勻細小。與鎂合金基體相比,表面改性層的顯微硬度和耐腐蝕性能均得到明顯提高,經(jīng)攪拌摩擦加工之后的添加Si Al混合粉末改性層的顯微硬度值最高可達296 HV,比母材提高了385.3%；添加Cu Al混合粉末改性層的自腐蝕電位最高可達-0.975 V,比母材也提高了37.4%。

    Abstract:

    Al Cu and Al Si powders were prepared on the surface of AZ31B magnesium alloy by a method of combining Laser cladding and friction stir processing. The microstructure and phase analyses of the modified layer were studied by scanning electron microscopy and X-ray diffraction measurement. Meanwhile, The microhardness and corrosion resistance of the modified layer were investigated in detail. The composite modified layers with Al Cu and Al Si powders are compose of β-Al12Mg17, AlCu4, AlMg and Mg2Si, AlMg, β-Al12Mg17, respectively. Both modified layer showed very good bonding with the magnesium alloy substrate. The microhardness and corrosion resistance of the modified layer are higher than that of substrate. Compared with the matrix, the maximum microhardness (296 HV) of the modified layer with Al Si powders increased by 385.3%, and the maximum self-corrosion potential (-0.975 V) with Al Cu powders increased by 37.4%.

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劉奮軍,孟慶森,李增生. AZ31B鎂合金表面激光熔敷 攪拌摩擦加工改性層結(jié)構(gòu)與性能研究[J].稀有金屬材料與工程,2016,45(9):2419~2423.[LIU Fenjun, MENG Qingsen, LI Zengsheng. Investigation on the Microstructure and Properties of AZ31B Magnesium Alloys Modified Layers by Laser Cladding Friction Stir Processing[J]. Rare Metal Materials and Engineering,2016,45(9):2419~2423.]
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  • 收稿日期:2015-12-29
  • 最后修改日期:2016-02-01
  • 錄用日期:2016-03-29
  • 在線發(fā)布日期: 2016-10-09
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