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高能電子束處理對AZ91鎂合金耐磨性影響
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Effect of Pulsed High Energy Electron Beam Treatment on the Wear
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    摘要:

    研究了AZ91鎂合金電子束表面處理的耐磨性。結(jié)果表明，在不同處理條件下, AZ91鎂合金表面分別形成了厚度為20~60 μm的表面熔凝層；脈沖電流和脈沖次數(shù)對表面熔凝層厚度具有較大影響，而加速電壓的影響不大。隨著脈沖電流的增加， Mg17Al12 相對應的衍射峰強度呈現(xiàn)上升趨勢, 并且在處理過的AZ91鎂合金中可看到AlMg亞穩(wěn)相的存在。顯微硬度測試結(jié)果表明，處理層硬度比基體組織的硬度有所提高，最表層可達到基體組織的2倍。磨擦系數(shù)和表面磨損量均有不同程度下降，耐磨性明顯提高主要是由于快速熔凝導致晶粒細化引起的

    Abstract:

    The effect of pulsed high-energy electron beam on the surface modification of AZ91 magnesium alloy has been studied. The results show that the re-melted coatings (20~60 mm in thickness) on the surface of AZ91 magnesium alloy has been obtained under different treatment conditions. It was found that the thickness of the melted surface layer varies with the electron beam current and numbers of pulses, but the voltage has a minimal effect. The intensity of the diffraction peak assigned to Mg17Al12 increases with the increase of the electron beam energy, and a metastable AlMg phase has also been found from the XRD patterns of the treated AZ91 alloy. The treated surface layer exhibits a higher hardness than the AZ91 alloy, and the hardness of the topmost layer is two times as higher as the substrate. The friction coefficient and the wear volume of AZ91 alloy after electron beam treatment decrease obviously. The wear resistance of treated samples increases obviously, may be due to the high hardness from the grain refinement

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趙 暉,徐 玲,陳立佳,劉 正.高能電子束處理對AZ91鎂合金耐磨性影響[J].稀有金屬材料與工程,2009,38(11):2048~2052.[Zhao Hui, Xu Ling, Chen Lijia, Liu Zheng. Effect of Pulsed High Energy Electron Beam Treatment on the Wear[J]. Rare Metal Materials and Engineering,2009,38(11):2048~2052.]
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  • 收稿日期:2008-11-19
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