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Fabrication of Carbon Nanotube-Reinforced 6061Al Alloy Matrix Composites by an In Situ Synthesis Method Combined with Hot Extrusion Technique

Chun-Nian He , Chao Feng , Ji-Chuan Lin , En-Zuo Liu , Chun-Sheng Shi , Jia-Jun Li , Nai-Qin Zhao

Carbon nanotube (CNT)-reinforced 6061Al alloy matrix composites were prepared by chemical vapor deposition (CVD) combined with hot extrusion technique. During the preparation process, the 6061Al flakes obtained by ball milling of the 6061Al spherical powders were subjected to surface modification to introduce a hydrophilic polyvinyl alcohol (PVA) membrane on their surface (6061Al@PVA) to bond strongly with nickel acetate [Ni(II)]. Then the 6061Al@PVA flakes bonded with Ni(II) were calcined and reduced to Ni nanoparticles, which were then heat-treated at 580 °C to remove PVA for obtaining even Ni/6061Al catalyst. After that, the as-obtained Ni/6061Al catalyst was employed to synthesize CNTs on the surface of the 6061Al flakes by CVD. After hot extrusion of the CNT/6061Al composite powders, the as-obtained CNT/6061Al bulk composites with 2.26 wt% CNTs exhibited 135% increase in yield strength and 84.5% increase in tensile strength compared to pristine 6061Al matrix.

关键词: Metal , matrix , composites , (MMCs) , Microstructure , Mechanical , properties , Carbon

氮含量对脉冲偏压电弧离子镀CNx薄膜结构与性能的影响

李红凯 , 林国强 , 董闯 , 闻立时

金属学报

用脉冲偏压电弧离子镀设备在保持脉冲偏压一致和工作气压恒定的条件下, 控制不同氮流量在硬质合金基体上制备了不同氮含量的CNx薄膜. 用SEM, GIXRD, XPS, 激光Raman谱和纳米压入等方法分别研究了薄膜的表面形貌、成分、结构与性能. 结果表明, 随着氮流量的增加, 薄膜中氮含量先是线性增加然后趋于平缓, 薄膜呈非晶结构且为类金刚石薄膜, 其硬度与弹性模量随着氮含量增加先增加后下降, 在x=0.081时出现最大值, 分别为32.1 GPa和411.8 GPa. 分析表明, 通过氮含量的改变而使sp3键含量发生改变是影响薄膜性能变化的重要因素.

关键词: 氮化碳薄膜 , pulsed bias , arc ion plating , microstructure , properties

Mechanical and Transformation Behaviors of a C-Mn-Si-Al-Cr TRIP Steel under Stress

Xiaodong WANG , Baoxu HUANG , Yonghua RONG , Li WANG , null , null , null , null

材料科学技术（英文）

Transformation induced plasticity (TRIP) steels combine high strength and excellent ductility, making them suited for application in crash-relevant parts in the automotive industry. However, the high Si contents in the conventional TRIP steel will generate surface defects on the hot rolled strip, which is difficult to process in continuous galvanizing lines. In order to solve the above problem the TRIP steel with the addition of Al replacing majority of Si was designed. In the present paper, the volume fraction of various phases in a C-Mn-Si-Al-Cr TRIP steel was determined by metallographic examination and X-ray diffraction analysis, and the multi-phase microstructures were characterized using an atomic force microscope based on their height difference. Tensile tests were performed at different temperatures ranging from -40℃ to 90℃. The results show that transition temperature MSσ in the present TRIP steel cannot be determined due to its lower volume fraction of retained austenite, different from the conventional TRIP steel. While the yield stress and tensile strength at different temperatures are higher than those of the conventional TRIP steel, which is attributed to the addition of Cr. In order to evaluate the effect of martensitic transformation on the total elongation, the sample without retained austenite obtained by quenching in liquid nitrogen was carried out under tensile test. The results indicate that the elongation of the original sample containing 9% retained austenite is about 20% higher than that of the sample quenched in liquid nitrogen, which demonstrates that the retained austenite plays an important role in improving the elongation of the TRIP steel.

关键词: TRIP steel , steel , mechanical , properties , retaine

MAGNETIC PROPERTIES AND CRYSTALLIZATION OF AMORPHOUS ALLOYS Co_(90-x)Cr_xZr_(10)

HU Fengxia State Key Laboratory of Magnetism , Institute of Physics , Academia Sinica , Beijing , ChinaCHEN Jinchang Beijing Teacher's College , Beijing , ChinaSHEN Baogen GUO Huiqun State Key Laboratory of Magnetism , Institute of Physics , Academia Sinica , Beijing , China

金属学报(英文版)

Curie temperature of amorphous alloys Co_(90-x)Cr_x Zr_(10) decreases linearly with increas- ing x.Average magnetic moment per magnetic atom Co or Cr is 1.51 μB or -3.62 μB respectively.The temperature dependence of spontaneous magnetization at low temper- atures is in agreement with Bloch's T~(3/2) law.The spin wave stiffness constant decreases with increasing x from 4 to 20.The range of interaction is 2—3 atoms for x=4 and nearest neighbour atom for x=20.The crystallization temperature increases mono- tonically with increasing x.It may relate to the average number of outer electrons per atom.The crystalline phase components of heat-treated alloys were analyzed by X-ray diffration and thermomagnetic measurement.

关键词: amorphous state , null , null , null , null

预化学镀镍时间对铝基化学镀镍层性能的影响

孙硕 , 宋贡生 , 马正华

表面技术 doi:10.16490/j.cnki.issn.1001-3660.2016.01.008

目的揭示试样的显微形貌随预化学镀镍时间的变化规律,并探讨试样的显微形貌、镀层的结合强度及耐蚀性能的相关性. 方法以预化学镀镍时间为变量,通过化学沉积方法制得化学镀镍层. 采用扫描电镜观察预镀层及化学镀镍层的表面形貌,采用热震试验、弯曲试验和划格试验测试镀层的结合力,并对化学镀镍层与铝基体之间的结合力进行评价. 采用电化学方法对镀层在模拟燃料电池腐蚀介质中的耐蚀性进行评价. 结果随着预化学镀镍时间的延长,颗粒尺寸不断增大,预化学镀镍层形貌先逐渐变得均匀、致密,之后又变得粗糙不均匀. 化学镀镍层的耐蚀性以及与基体的结合力呈现出先增加后降低的趋势. 结论预化学镀镍时间在5 min时,所得化学镀镍层的表面形貌最平整,结合力最好,耐蚀性最佳.

关键词: 预化学镀镍 , 前处理 , 铝基 , 化学镀镍 , 性能 , 表面形貌 , 结合力 , 耐蚀性

改性聚硫氨酯密封材料的制备及性能

付亚伟 , 王硕太 , 蔡良才 , 陈黎明

高分子材料科学与工程

制备了兼具聚氨酯、聚硫橡胶结构特征和性能优势的新型绿色高性能高分子密封材料——改性聚硫氨酯,并考察了其制备机理、流平性、弹性恢复率、拉伸模量、浸水和浸油后定伸粘接性、冷拉—热压后粘接性、质量损失率、抗燃性及耐老化性能。结果表明,聚硫氨酯强度高,变形、弹性恢复和耐老化性优良,模量和质量损失低,定伸60%、100%、150%、200%下弹性恢复率达97%、98%、90%、88%,23℃和-20℃拉伸60%、100%的拉伸模量达0.06 MPa、0.09 MPa和0.08 MPa、0.13 MPa,标准、浸水、浸油条件下定伸60%、100%、150%、200%其定伸粘接、拉伸幅度±20%、±25%、±35%、±50%下热压冷拉均无破坏,质量损失仅1.0%,可有效提高防水和密封效果。

关键词: 密封材料 , 聚硫氨酯 , 聚硫 , 聚氨酯 , 改性 , 制备 , 性能

304L不锈钢表面激光熔覆Fe-Cr-Si-P非晶涂层

王彦芳 , 鲁青龙 , 肖丽君 , 石志强

稀有金属材料与工程

采用激光熔覆技术在304L不锈钢基体表面制备了Fe-Cr-Si-P非晶复合涂层.利用光学显微镜(OM)、X射线衍射仪(XRD)、扫描电子显微镜(SEM)、电化学测试系统和摩擦磨损试验机等分析了涂层的组织结构、相组成、耐蚀及耐磨等性能.研究结果表明,激光熔覆层组织主要由表层“梅花”形树枝晶区,中心非晶区和树枝晶结合区组成,熔覆层与基体呈现良好的冶金结合.熔覆层中除了非晶相外,还有少量Fe3P和Fe2Si等金属间化合物相.涂层的硬度HV0.2约为8000 MPa,是基体硬度的4倍；腐蚀电位Ecorr和自腐蚀电流密度icorr分别为-449.3 mV和-4.34 μA/cm2;在100 N载荷下摩擦系数仅为0.076,具有较好的综合性能.

关键词: 激光熔覆 , 非晶涂层 , Fe-Cr-Si-P , 组织 , 性能

利用植物油制备聚氨酯材料的研究进展

张欢 , 周建军 , 何明 , 朱金 , 罗振扬

材料导报 doi:10.11896/j.issn.1005-023X.2014.23.019

概述了植物油在聚氨酯材料中的研究发展现状,重点介绍了从植物油出发,通过羟基改性法、环氧化-开环法、加氢甲酰化-还原法和酯交换化法制备多元醇,以及制备植物油基异氰酸酯的方法,对比了各种制备方法对相应的聚氨酯材料性能的影响,探讨了植物油基聚氨酯材料研究目前存在的问题,并对其发展前景提出了自己的观点.

关键词: 植物油 , 聚氨酯 , 合成 , 性能

成分梯度对激光立体成形Ti3Al/TC11连接界面组织和性能的影响

刘莹莹 , 林鑫 , 杨海鸥 , 张温馨

稀有金属材料与工程

采用激光立体成形制备Ti3Al/TC11双合金件,研究不同过渡区层数即不同成分梯度时Ti3Al/TC11激光烧结连接界面的显微组织、拉伸性能及显微硬度.结果表明,成分梯度对连接界面的组织形貌影响较大,尤其对TC11侧界面的组织影响更为显著.成分梯度对Ti3Al/TC11试样连接界面显微硬度的平均值影响很小,但对其分布的均匀性影响较大.随着过渡区成分梯度的减小,连接界面显微硬度分布的均匀性提高.具有较小成分梯度即10层过渡区的试样综合性能较佳,这与过渡区层数的增多减小了相邻两层之间的成分梯度、缩小连接界面组织形貌的差异,从而提高了连接界面的完整性有关.

关键词: Ti3Al/TC11 , 激光立体成形 , 成分梯度 , 组织 , 性能

碳化硼薄膜制备的研究进展

范强 , 廖志君 , 伍登学

材料导报

综述了碳化硼材料的主要性能和制备碳化硼薄膜的主要方法,讨论了包括磁控溅射、离子束沉积和化学气相沉积等制备方法的优点及重要工艺参数,并就各方法指出了提高薄膜性能的主要措施,指出制备出更均匀、致密的碳化硼薄膜,提高薄膜与基体间的结合力,降低薄膜应力仍是今后研究的重点.

关键词: 碳化硼 , 薄膜 , 性能 , 制备方法

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