轻质金属基复合材料

Mg2 Si弥散强化的镁基复合材料〔1〕　镁合金如果在强度、硬度、抗磨性和耐蚀性方面得到提高 ,作为一种特殊的轻质高强度材料 ,将会在节能降耗方面带来重大的经济效益。因此 ,在镁粉 硅粉混合压块中利用就地合成Mg2 Si弥散颗粒的途径制取镁基复合材料 ,研究了这种弥散颗粒的强化效果及其分布的均匀性对其力学性能的影响。研究时采用了平均粒度分别为 2 2 3μm和 10 9 9μm的细硅粉和粗硅粉 ,并采用粒度为 111 5 μm的纯镁粉为原料。纯镁粉与 5 %、10 %、15 %和 2 0 % (质量 )硅粉的混合物共 4批 ,每批混合物均以 6 0 0MPa的压力冷压固…     

Self-Healing Metals and Metal Matrix Composites

Self-healing in inorganic materials is a relatively new area in materials science and engineering that draws inspiration from biological systems that can self-repair damage. This article reviews the preliminary attempts to impart self-healing behavior to metals. Several challenges yet exist in the development of metallic alloys that can self-repair damage, including surface bonding issues, such as liquid/solid contact angle (wetting) and oxidation, and practical issues, such as capillary pressure for delivery of a liquid metal to a damaged area or crack, and the overall mechanical properties of a composite system. Although the applied research approaches reviewed have obtained marginal success, the development of self-healing metallic systems has the potential to benefit a wide range of industrial applications and thus deserves greater investment in fundamental research.     

Graphene-Reinforced Metal and Polymer Matrix Composites

Composites have tremendous applicability due to their excellent capabilities. The performance of composites mainly depends on the reinforcing material applied. Graphene is successful as an efficient reinforcing material due to its versatile as well as superior properties. Even at very low content, graphene can dramatically improve the properties of polymer and metal matrix composites. This article reviews the fabrication followed by mechanical and tribological properties of metal and polymer matrix composites filled with different kinds of graphene, including single-layer, multilayer, and functionalized graphene. Results reported to date in literature indicate that functionalized graphene or graphene oxide-polymer composites are promising materials offering significantly improved strength and frictional properties. A similar trend of improved properties has been observed in case of graphene-metal matrix composites. However, achieving higher graphene loading with uniform dispersion in metal matrix composites remains a challenge. Although graphene-reinforced composites face some challenges, such as understanding the graphene-matrix interaction or fabrication techniques, graphene-reinforced polymer and metal matrix composites have great potential for application in various fields due to their outstanding properties.     

Progress in Metal Matrix Composites

Abstract

Metal matrix composites are produced by several contrasting manufacturing techniques and in many different shapes and forms. Solid state processing routes are generally favoured for putative aerospace applications, whereas liquid metal routes appear more promising for automobile applications. Both groups of production routes can accommodate reinforcements of continuous fibre, short fibre, particulate and hybrid fibre-particulate types and the reinforcement phase can be distributed uniformly throughout the composite structure or, using preform technology, in selected regions of the casting.

The greatest problem arising during manufacture and during post-production thermal processing of MMCs is that of chemical instability of the constituent phases. Thermodynamic incompatibilities restrict the use of certain manufacturing routes for specific composite couples and limit the working environment of others. Commercial aspects of MMC production, either directly to near net shape or by subsequent machining, indicate high cost penalties for specific limited gains.

The mechanical properties of MMCs are inevitably a compromise between the properties of the matrix and reinforcement phases. In particular, ductility and toughness are frequently sacrificed for higher modulus. Measures to improve toughness whilst maintaining stiffness are being explored. Wear properties of MMCs are extremely good; machinability, on the other hand, can be poor.     

石墨/铜铁基自润滑复合材料的摩擦学性能研究

采用感应加热烧结粉末冶金的方法,以铜铁合金为基体,添加石墨制备石墨/铜铁基自润滑复合材料,对比研究了添加石墨前后2种材料的组成、结构、表面形貌及摩擦学性能,并分析了磨损机理。研究结果表明:添加石墨能起到润滑作用,使材料的摩擦因数减小,磨损率降低;添加的石墨一部分转化成新态,其余则进入材料的空隙中,在摩擦过程中形成润滑膜起到减摩的作用;添加石墨后,摩擦材料的磨损机制由粘着磨损变为磨粒磨损。     

金属基复合材料的性能和应用

对金属基复合材料的发展历程作了简单的回顾,并描述了金属基复合材料出色的综合性能及其在运输、热学管理、航空航天、工业、娱乐业和基础设施等行业的应用;最后对金属基复合材料(MMCs)的发展作出展望。     

金属基复合材料的性能和应用

对金属基复合材料的发展历程作了简单的回顾。并描述了金属基复合材料出色的综合性能及其在运输、热学管理、航空航天、工业、娱乐业和基础设施等行业的应用；最后对金属基复合材料（MMCs）的发展作出展望。     

金属基复合材料的发展与应用

介绍了金属基复合材料的研究及发展历程,以及国内外的研究进展情况,例举了一些不同制备工艺的金属基复合材料的力学性能和金属基复合材料在各方面的应用.     

自生金属基复合材料的研究进展

综述金属基自生复合材料的熔铸法制备工艺 ,国内、国外相关研究情况 ,应用的最新进展。在分析存在的问题的基础上 ;提出开展“可设计材料”研究的思路。     

金属基复合材料的研究现状与发展

对金属基复合材料的分类、制造方法进行综述,阐述国内外研究现状,提出在重金属复合材料的研究中存在的问题,探讨对重金属基复合材料的研究方向.     

铝基复合材料焊接的研究现状与展望

介绍了铝基复合材料几种典型的熔化焊、钎焊、固相焊接方法。从焊接的特点,所面临的问题等方面介绍了这几种焊接方法的研究进展,并重点介绍了目前最受关注的搅拌摩擦焊接技术在铝基复合材料中的研究进展。最后展望了这些焊接方法的发展前景。     

钛的锻造

综述了增强相涂层种类、涂层制备方法及其对金属基复合材料界面和性能的影响。根据涂层的功能将涂层分为润湿涂层、阻挡涂层和调节界面涂层。对化学镀、化学气相沉积、溶胶－凝胶法及其它涂层制备方法作了扼要讨论。也介绍了单涂层、双涂层及复合涂层对金属基复合材料界面及性能的影响。     

Electrochemical Machining of Aluminium Metal Matrix Composites

High performance aluminium based metal matrix composites possess low machinability characteristic. Electrochemical machining (ECM) is one of the advanced machining processes, used for machining of these newly developed exotic materials. This article critically reviews the research work on experimental investigations on ECM of aluminium matrix composites. Besides, recently developed techniques such as abrasive assisted electrochemical machining, electrochemical grinding, electrochemical micromachining, and electrochemical drilling are explored in the processing of aluminium metal matrix composites.     

Alloy Microstructures in Cast Metal Matrix Composites

This article provides some insight into an area that has here-to-fore been ignored, namely, the matrix microstructure of cast metal matrix composites (MMC). Using the Al-4.5% Cu alloy as a model matrix alloy, the factors influencing the cast microstructure are explored on samples reinforced with several types of fibers. The nature of the fibers, their diameter and distribution along with conventional solidification parameters have a profound influence on the matrix microstructure. A full exploration of the relationships between properties, microstructures and processing parameters is required for the optimization of this class of materials.     

颗粒增强金属基复合材料的发展概况

从材料选择、制备工艺和生产应用等多方面对颗粒增强金属基复合材料的发展现状进行了综合评述,指出颗粒增强金属基复合材料的研究与开发应走系统化、规模化、可持续发展的道路。     

Characterization of Interfaces in Metal Matrix Composites

Fiber matrix interfaces in continuous fiber reinforced composites have been suspected as the regions of imperfections, high dislocation densities, residual stresses, etc., which affect the material’s properties. This paper examines micro-structural features of graphite/aluminum using analytical transmission electron microscopy. Included is the determination of dislocation densities at the interfaces by weak beam imaging technique. Also observed are tangled dislocation networks at the fiber matrix interfaces.     

金刚石颗粒/金属基复合材料的研究进展

以金刚石颗粒与某些金属材料复合,可以制备出具备高导热、高耐磨、高硬度等突出性能的功能或工程结构材料,在电子元器件、装备制造、轨道交通等领域具有广阔的应用前景。系统地综述了金刚石颗粒作为增强体制备金属基复合材料的特点及研究现状,总结了金刚石颗粒/金属基复合材料的常用制备技术和方法,提出了金刚石颗粒/金属基复合材料研究中存在的问题。     

涂层刀具钻削金属基复合材料

为改善金属基复合材料的加工质量,提高加工精度,对表面涂覆金刚石薄层的涂层刀具开展了钻削实验研究。结果表明,与未涂层刀具相比,涂层刀具轴向力小,磨损程度轻,钻孔几何轮廓规则且表面质量好,是钻削加工金属基复合材料的优先首选。