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Cell parameters and phases of La0.7Mg0.3Ni2.8Co0.7?xAlx hydrogen storage alloy 晶胞体积的增大主要是由于Al的原子半径大于Ni和Co的原子半径引起的,同时也表明,x值在一定范围内变化时,Al元素可以线性固溶于La2Ni7相中,但随着Al含量的继续增加,La2Ni7相晶胞逐渐膨胀,能量逐渐升高... Charge-discharge cycle curves of hydrogen storage alloy electrodes: (a) La0.7Mg0.3Ni3.5?xAlx; (b) La0.7Mg0.3Ni2.8- Co0.7?xAlx 由此可见,对这两种体系合金,较低的Al替代量可改善合金的最大放电容量和循环性能,而过高的Al含量不利于合金电化学性能的提高.结合合金相结构的分析可以......
and tribological performances were investigated. The results show that when Al content is 4.25%, the graphite content is high, the eutectic graphite is the main morphology and the matrix of the alloy is single γ... Al content is 6.85%, the γ-Ni(Al) solution and a small quantity of (γ+γ′) eutectic make up the matrix of the alloy. When the Al contents are 8.13%-9.94%, γ-Ni(Al) solution disappears, the solidifying......
roughness on the diffusion bonding of Al alloy 6061 in air [J]. Materials Science and Engineering A, 1999, 270: 244-248. [8] HUANG Y, RIDLEY N, HUMPHREYS F J, CUI J Z. Diffusion bonding... of layers was increased with increasing the operating temperature. According to the results, diffusion of aluminum atoms into magnesium alloy was more and the interface movement towards the Al alloy......
in Ni-Al diffusion couple prepared by electrodeposition of Ni on Al substrate were investigated. The nickel coating with 20 μm thickness was applied on 6061 aluminum alloy by direct current... composite coating on 6061 Al alloy from a modified Watts bath containing suspended Al2O3 particles. Afterward, the coated samples were heat-treated at 450 °C for 120 and 240 min, respectively. Figure......
6061铝合金微弧氧化膜的组织及热震性能 李夕金1,张盈1,蒋兴莉1,田华1,杨卓1,薛文斌1 (1.北京师范大学材料科学与工程系,北京,100875;2.北京师范大学低能核物理研究所,北京,100875) 摘要:利用微弧氧化方法在6061铝合金上制备陶瓷膜.采用扫描电镜和X射线衍射仪研究了氧化膜的截面组织,成分和相结构,并用划痕法和热震试验评价了膜层与铝基体结合状况.结果表明微弧氧化膜由致密层和疏松层组成,氧化膜主要相组成为γ-Al2O3,α-Al2O3和SiO2非晶相.划痕压力为55N时50μm膜层开始被破坏.热震试验结果表明,50μm膜层样品经过500℃→水淬50次循环后无变化.膜层越薄,抗热震性能越好,膜层表面抛光有利于提高微弧氧化膜的热震性能. 关键词:微弧氧化; 6061铝合金; 划痕; 热震; [全文内容正在添加中] ......
DIFFUSION WELDING FOR 6061 Al REINFORCED WITH SiCw WHISKERNIU Jitai LIU Liming HAN Lihong Harbin Institute of Technology摘 要:<正> The weldability... temperature between liquidus and solidus of matrix alloy. Diffusion welding of SiCw/6061.Al was successfully realized with appropriate welding parameters.关键词:......
们选取经240, 285和330℃退火这3个试样来观察材料微观组织的变化和宏观织构的演变. 图2 6061铝合金DCAP后退火1h时退火温度与维氏硬度的关系 Fig.2 Vickers hardness vs annealing temperature of 6061 Al annealed for 1h after DCAP 图3所示为6061铝合金DCAP变形后经1h不同温度退火...文章编号: 1004-0609(2005)04-0519 -05 6061铝合金ECAP变形后退火组织稳定性和织构变化 覃继宁1, 张 荻1, 张国定1, J. C. Lee2 (1. 上海交通大学 金属基复合材料国家重点实验室, 上海 200030; 2. Division of Materials Science and Engineering,Korea University......
on molybdenum base TZM (Mo-0.5Ti-0.1Zr-0.02C) alloy[J]. Surface & Coatings Technology, 2012, 206: 3393-3398. [9] KRAKHMALEV P V, STROM E, LI C. Microstructure and properties stability of Al-alloyed...: 739-744. [11] 范华山, 徐 江. 铝元素对MoSi2涂层抗氧化性能的影响[J]. 机械工程材料, 2013, 37(11): 17-20. FAN Hua-shan, XU Jiang. Effect of Al element on oxidation resistance of MoSi2 coating[J]. Materials for Mechanical......
words: AB5-type Co-free hydrogen storage alloy; Al content; crystal structure; electrochemical properties 近年来, 基于AB5型贮氢合金的MH电池在功率特性上的优势以及良好的发展前景, 如何降低合金成本和进一步改善其电化学性能仍在世界范围内深入进行研究[1, 2..., Gulbrandsen-Dahl S, Valen L O, et al. Structural and electrochemical characterization of a melt spun AB5-type alloy[J]. J Alloys and Compounds, 2005, 396: 100-107. [3]Iwakura C, Kazuhiro O, Hiroshi S, et......
as reinforcement so as to fabricate Al 6061/rock dust composites. The chemical composition of Al 6061 alloy is shown in Table 1. Rock dust was collected from quarries and Table 2 presents the detail of its... the stirrer at different speeds; a hydraulic lifting mechanism was used to bring the stirrer in contact with composite material. Table 1 Chemical composition of Al 6061 alloy (mass fraction......
