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Mg-Nd-Zn-Zr合金表面激光熔覆Al-Si/Al2O3復(fù)合涂層研究
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上海工程技術(shù)大學(xué)材料工程學(xué)院 上海,上海工程技術(shù)大學(xué)材料工程學(xué)院 上海,上海交通大學(xué)輕合金精密成型國(guó)家工程中心 上海,上海工程技術(shù)大學(xué)材料工程學(xué)院 上海

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TG146

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國(guó)家自然科學(xué)基金資助(項(xiàng)目號(hào)51271121,51471109)


Study on laser cladding of a Mg-Nd-Zn-Zr Mg alloy with Al-Si/Al2O3 powders
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School of Materials Engineering,Shanghai University of Engineering Science,School of Materials Engineering,Shanghai University of Engineering Science,National Engineering Research Center of Light Alloy Net Forming,Shanghai Jiao Tong University,School of Materials Engineering,Shanghai University of Engineering Science

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    摘要:

    本文采用激光熔覆Al-Si/Al2O3粉體來(lái)對(duì)Mg-Nd-Zn-Zr鎂稀土合金進(jìn)行表面改性，并對(duì)熔覆層的形貌、組織、相組成及性能進(jìn)行了表征。X射線(xiàn)衍射（XRD）分析和掃描電鏡（SEM）觀察顯示，熔覆層主要由α-Mg、Mg2Si、Mg12Nd以及Al3.21Si0.47或Mg17Al12幾種相組成，而Al2O3則大部分聚集在熔覆層和基體之間的界面處。截面硬度測(cè)試顯示，熔覆層的顯微硬度最高值在309HV至475HV之間，是基體硬度（55HV）的5~8倍以上，這主要?dú)w結(jié)為熔覆層內(nèi)晶粒細(xì)化、固溶強(qiáng)化、增強(qiáng)相的形成以及氧化物顆粒的彌散強(qiáng)化作用。在3.5wt%NaCl水溶液中的電化學(xué)測(cè)試顯示，激光熔覆后的鎂合金腐蝕電位上升，腐蝕電流密度可由基體的1.683×10-4A/cm2下降至激光熔覆后的0.843×10-5A/cm2，表明激光熔覆后樣品表面的腐蝕性能也得到顯著提高。

    Abstract:

    In this paper, laser cladding of Al-Si/Al2O3 powders was applied on a Mg-Nd-Zn-Zr magnesium rare earth alloy, and the microstructure, phase components and properties of the clad layers were carefully characterized. X ray diffraction (XRD) analyses and scanning electron microscope (SEM) observations show that the clad layer is mainly consisted of α-Mg, Mg2Si, Mg12Nd and Al3.21Si0.47 or Mg17Al12 phases. However, Al2O3 particles agglomerate at the bottom of the clad layer close to the melt-substrate interface. The cross section microhardness tests reveal that the maximum hardness of the clad layer ranges from 309HV to 475HV, about 5 to 8 times higher than that of the Mg-Nd-Zn-Zr alloy (55HV) substrate. Such an increased hardness is attributed to the grain refinement, the solution strengthening, the formation of hardening phases and the dispersion strengthening from oxide particles. According to the potentiodynamic polarization measurements carried out in the 3.5wt% NaCl water solution, the corrosion potential of the alloy increased after laser cladding, while the corrosion current density decreased from 1.683×10-4(A/cm2)for the Mg alloy substrate to 0.843×10-5(A/cm2)for the laser clad alloy. Therefore, the corrosion resistance of Mg-Nd-Zn-Zr alloy can also be significantly improved by laser cladding with Al-Si/Al2O3 powders.

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張志民,張可敏,鄒建新,刁云華. Mg-Nd-Zn-Zr合金表面激光熔覆Al-Si/Al2O3復(fù)合涂層研究[J].稀有金屬材料與工程,2017,46(9):2594~2600.[Zhimin Zhang, Kemin Zhang, Jianxin Zou, Yunhua Diao. Study on laser cladding of a Mg-Nd-Zn-Zr Mg alloy with Al-Si/Al2O3 powders[J]. Rare Metal Materials and Engineering,2017,46(9):2594~2600.]
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  • 收稿日期:2015-05-17
  • 最后修改日期:2015-08-02
  • 錄用日期:2015-10-13
  • 在線(xiàn)發(fā)布日期: 2017-11-29
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