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J. Cent. South Univ. (2018) 25: 961-975 DOI: https://doi.org/10.1007/s11771-018-3797-5 Effect of annealing treatment on microstructure and fatigue crack growth behavior of Al–Zn–Mg–Sc–Zr alloy CHEN... in the rupture region was inversely proportional to yield strength. Key words: Al–Zn–Mg–Sc–Zr alloy; annealing treatment; microstructures; fatigue crack growth rate; fatigue crack path Cite this article......
temperature on AM60 Mg alloy semi-solid slurry prepared by self-inoculation method (Ⅰ) LI Yuan-dong1, 2, YANG Jian1, MA Ying1, 2, QU Jun-feng1, ZHANG Peng1 (1. State Key Laboratory of Gansu... of Technology, Lanzhou 730050, China) Abstract: The semi-solid slurry of AM60 Mg alloy was prepared by a novel self-inoculation method(SIM). The effect of pouring temperature on the semi-solid slurry......
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能提高Mg基体的自腐蚀电位,并减少其腐蚀电流密度.浸泡实验后,除了局部小区域有个别点蚀坑外,膜基本保持完整；而基体却腐蚀严重.说明碳钠铝石转化膜能很好地保护镁合金. 关键词:镁合金；碳钠铝石；转化膜；腐蚀 (Edited by FANG Jing-hua) Foundation items: Project (50901082) supported by the National... was developed to improve the corrosion resistance of AZ31 Mg alloy. The film was prepared by two steps: the AZ31 alloy was first immersed in an Al2(SO4)3 solution venting CO2 gas to form a precursor......
. 图2 AM60镁合金与H62铜合金电偶对不同实验周期下镁合金试片的表面形貌 Fig.2 Surface morphologies of AM60 magnesium alloy coupled with H62 brass after different exposure time 图3 AM60镁合金与LY12铝合金电偶对不同实验周期下镁合金试片的表...腐蚀产物的X射线衍射图. 结果表明, 其腐蚀产物成分与阴极材料及实验周期无关, 腐蚀产物的主要成分为MgSO3·6H2O, MgO, Mg(OH)2, Al(OH)3. 图4 镁合金试片腐蚀产物的X射线衍射谱 Fig.4 XRD pattern of corrosion product of magnesium alloys exposed in Beijing......
: In order to obtain an effective and reliable grain refiner for Mg-Al alloys, 1% (mass fraction) Mg3N2 was added into AZ31 Mg alloy. The microstructures of the Mg alloys were studied by optical... alloy is rarely found. In the fabrication of Al-Mg matrix composites, AlN particles were in-situ formed successfully by the reaction of Al with Mg3N2[12], and the possibility that AlN could be in-situ......
,用电化学和循环腐蚀试验分析镀层钢板的腐蚀行为和耐蚀性能,并用XRD分析镀层表面腐蚀产物的相组成.结果表明:热镀锌铝镁镀层中Al,Mg及Zn2Mg相的存在可以使镀层表面形成稳定的化合物,降低电化学试验时镀层的电流密度和溶解速度；镀层中的共晶相可以使Mg元素在镀层中均匀分布,从而抑制阴极反应；镀层腐蚀后形成的Zn5(OH)8Cl2·H2O和Zn6Al2(OH)16CO3·4H2O是不溶性的胶状腐蚀产...蚀行为.ISHIKAWA等[9]研究了热镀锌铝镁镀层的腐蚀产物,发现在水溶液中可以分离出ZnCl2,AlCl3以及MgCl2等化合物,并认为腐蚀产物是由Zn(Ⅱ),Al(Ⅲ)和Mg(Ⅱ)[Zn(Ⅱ)wAl(Ⅲ)xMg(Ⅱ)y](2w+3x+2y)(OH)(2w+3x+2y)-z-Clz·nH2O组成,它们凝聚在一起,形成致密的氧化膜,阻碍了镀层的进一步腐蚀.李锋等[10-11]研究热镀Zn-11......
密度小,比刚度和比强度高,能量衰减系数大和良好的电磁屏蔽性等优点,被称为最轻的工程结构材料,广泛应用于航空,航天,交通工具,3C产品,体育用品,便携式工具等行业.但因镁合金的电极电位低,与常用的金属结构材料如铝合金和钢铁等相比,极易发生腐蚀,而且镁合金的耐磨性也较差,这些因素都制约了镁合金的广泛应用,必须对其进行适当的表面处理后才能使用[1-3].目前,针对镁合金表面处理的方法很多,有化学处理,阳极氧化,微弧氧化和金属镀层,这些方法均可与有机涂层配合使用.其中,工艺最成熟的方法有化学处理和阳极氧化,但这两种方法所得膜层薄,耐蚀性差,而且因处理液中铬酐的加入对环境污染严重[4],难以满足人们的需求. 而微弧氧化又称阳极火花沉积,微等离子体氧化或等离子增强电化学表面陶瓷化,是一种在有色金属(Al,Mg,Ti等)及其合金表面涂覆陶瓷层的技术.该技术是通过电解溶液中,有色金属或合金表面的微弧放电......
and sizes of cross-section of AZ31 Mg alloy thin-walled tube (mm) 基于上述背景,本文作者旨在利用有限元方法,通过单一改变分流孔轴向倾角β,模拟研究分流孔轴向倾角对AZ31镁合金薄壁管分流挤压过程的影响规律,为优化模具结构提供理论指导；综合考虑挤压力,焊合质量,管材尺寸精度等因素,对分流孔轴向倾角进行优化设计. 1 有限元模型的建... on extrusion process of AZ31 Mg alloy thin-walled tube ZHANG Bao-jun1, YANG He1, GUO Liang-gang1, SHI Lei1, ZHENG Wen-da2, GU Rui-jie2, KOU Yong-le2 (1. State Key Laboratory of Solidification......
