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采用直流磁控溅射法在镁合金上沉积铝膜,在高真空下对铝膜进行加热后处理.用X射线衍射仪(XRD)分析膜层为纯铝多晶态,扫描电子显微镜(SEM)观察铝膜晶粒细小.采用纳米压痕/划痕仪对铝膜的厚度、临界附着力、硬度和弹性模量进行了测试,并且用辉光放电光谱仪(GDS)测试了镁合金表面铝膜的成分和性能随薄膜深度的分布.结果表明,铝膜的厚度随后处理温度的升高而降低,其表面硬度和弹性模量高于镁合金基体并且随深度增加而逐渐降低.铝膜与镁合金基体间存在一个过渡层,结合良好且表现出一定的弹塑性能,有利于镁合金表面的防护. 相似文献
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众所周知,齿轮传动是近代机器中最常见的一种机械传动,齿轮是机械产品的重要基础零部件。齿轮在工业发展中的地位一直比较突出,被公认为是工业化的一种象征。从这个角度来看,关注齿轮的先进加工技术和发展趋势具有极其重要的意义。 相似文献
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强烈塑性变形表面纳米化(SPD-SNC)技术是近几年才开始备受人们广泛关注的新技术,它不仅为研究形变诱发的纳米化过程和宽尺寸范围内(从微米到纳米量级)结构与性能的关系提供思路,制备理想样品;而且将纳米材料的优异性能应用于改造传统工程材料,显著地提高金属材料的性能,可望在工业上获得实际应用.从SPD-SNC的方法、机理、组织结构和性能等方面总结了该技术近年来取得的进展和存在的问题,指出了今后的研究发展方向. 相似文献
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以AZ31镁合金热喷涂铝涂层为研究对象,用自制的振动热扩散装置,进行一定温度热扩散或在热扩散的同时进行振动机械研磨处理,研究比较了振动热扩散对镁合金热喷铝涂层的影响.采用金相显微镜、扫描电子显微镜观察涂层表面、截面形貌,对涂层界面进行能谱分析,利用显微硬度计测量不同工艺下涂层与镁基体界面处硬度变化,利用X射线衍射分析涂层与基体界面处扩散区域相组成,用电化学工作站测得涂层极化曲线,通过盐水浸泡分析比较了不同工艺处理后镁合金的耐腐蚀性.结果表明:镁合金喷铝涂层经360~400℃保温2h热扩散或振动热扩散(机械研磨热扩散),在涂层与镁基体的界面处镁铝原子有不同程度的互扩散,并有镁铝Al12Mg17相生成,界面硬度有极大提高,振动热扩散使涂层明显致密化并形成连续析出相,能有效提高涂层的耐腐蚀性能. 相似文献
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Isothermal and isochronal annealing was conducted to study the thermal stability of the nanocrystalline in the surface layer of Mg alloy AZ91D induced by high-energy shot peening(HESP) .Field emission scanning electron microscope(FESEM) and X-ray diffractometer were used to characterize the microstructure.Results showed that nanocrystalline produced by HESP on the surface layer of the magnesium alloy AZ91D was 60-70 nm on average.The nanocrystalline could remain stable at about 100℃,and grew up slowly between 100℃ and 200℃.When the annealing temperature reached 300℃,the growth rate of the nanocrystalline increased significantly.The kinetic coefficient n of the nanocrystalline growth was calculated to be 2-3 and the grain growth activation energy Q=39.7 kJ/mol,far less than the self-diffusion activation energy of magnesium atoms in the coarse polycrystalline material. 相似文献
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Microstructures and properties of aluminum film and its effect on corrosion resistance of AZ31B substrate 总被引:1,自引:0,他引:1
Aluminum films with thickness of 8.78-20.82μm were deposited on the AZ31B magnesium alloys by DC magnetron sputtering.The influences of aluminum film on the micro-mechanical properties and corrosion behavior of the magnesium alloys were investigated.The morphology of aluminum film was examined by scanning electron microscopy and the microstructure of aluminum film was analyzed by X-ray diffiactometry.Nanoindentation and nanoscratch tests were conducted to investigate their micromechanical properties.More... 相似文献
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