Fabrication and Machining of Metal Matrix Composites: A Review

Intrinsically smart, metal matrix composites (MMCs) are lightweight and high-performance materials having ever expanding industrial applications. The structural and the functional properties of these materials can be altered as per the industrial demands. The process technologies indulged in fabrication and machining of these materials attract the researchers and industrial community. Hybrid electric discharge machining is a promising and the most reliable nonconventional machining process for MMCs. It exhibits higher competence for machining complex shapes with greater accuracy. This paper presents an up-to-date review of progress and benefits of different routes for fabrication and machining of composites. It reports certain practical analysis and research findings including various issues on fabrication and machining of MMCs. It is concluded that polycrystalline tools and diamond-coated tools are best suitable for various conventional machining operations. High speed, small depth of cut and low feed rate are a key to better finish. In addition, hybrid electrical discharge machining has proved to be an active research area in critical as well as nonconventional machining since last few years. This paper incorporates year-wise research work done in fabrication, conventional machining, nonconventional machining, and hybrid machining of MMCs. Conclusions and future scope are addressed in the last section of the paper.     

粉末雾化喷射成形制备颗粒增强金属基复合材料

颗粒增强金属基复合材料（ＭＭＣｓ）具有良好的综合性能，在航空、汽车及民用工业中的应用前景十分广阔。近年来粉末雾化喷射成形工艺用于制备颗粒增强ＭＭＣｓ受到了重视与发展。该方法通过快速凝固获得组织均匀、细小、无宏观偏折和高性能的新材料。在沉积过程中向基体合金的喷雾中喷入增强相颗粒即可制成高性能ＭＭＣｓ。本文介绍这一方法的基本原理和最新进展。     

铝金属基复合材料Al6061/SiCp表面混合稀土转化膜的研究

利用浸渍法在铝金属基复合材料Al6 0 6 1/SiCp表面获得了混合稀土转化膜。利用湿热试验、盐水浸渍试验和电化学测试方法 ,评价了膜的耐蚀性能。用扫描电镜观察了膜的表观形貌 ,利用X射线衍射仪研究了膜的微观形态 ,膜是以非晶态形式存在的     

原位合成及外加法制备碳化钒颗粒增强铁基复合材料的研究

通过粉末冶金工艺制备碳化钒颗粒增强铁基复合材料,研究了原住合成和外加法对复合材料烧结密度、性能及组织结构的影响,并借助金相、SEM、EDS观察了碳化钒的分布及元素成分。试验结果表明：原位合成复合材料具有更高的烧结密度和抗弯强度,在1280℃时达到最大值,分别为7．4g．cm^-3和983MPa,在烧结过程中反应生成了碳化钒颗粒,主要分布在晶界;外加法中的碳化钒颗粒分布更均匀,并通过扩散作用融入Cr、Mo、Fe等合金元素。     

Continuous Fiber Reinforced Titanium Matrix Composites: Fabrication,Properties, and Applications

Titanium matrix composites (TMCs) have been developed as high performance materials for light weight structural applications. The materials are comprised of a silicon carbide (SiC) fiber embedded in a titanium matrix, thus making use of the high strength of the SiC fibers, their high stiffness and creep resistance at elevated temperatures combined with the damage tolerance of titanium alloys. Since materials properties are closely related to the quality of the fabrication process, TMC processing is of major importance. Moreover, reinforcement‐induced anisotropy of the material and thermal residual stresses formed during the consolidation process must be considered and understood for proper component design. Finally, modeling using FE methods reduces the time needed for component development and helps to elucidate failure mechanisms of the material.     

New Generation Metal Matrix Composites

Metal matrix composite (MMC) materials have attracted considerable attention due to their ability to offer unusual combinations of stiffness, strength to weight ratio, high temperature performance, and hardness. Extensive research work in this area has led to the development of novel in situ processing techniques that are now being used to new generation metal matrix composites that can be used in wide ranging applications in diverse fields. The development and processing of these new generation metal matrix composites are highlighted in this report.     

金属基复合材料研究新进展

新材料的研究、发展及应用是当代高新技术的重要内容之一。金属基复合材料因具有较高的比强度、比刚度,优良的导电导热性,以及高韧性和高抗冲击性而对促进世界各国军用和民用领域的高新科技现代化,起到了至关重要的作用。文章简单综述了金属基复合材料的分类、制备新工艺及应用,并探讨了金属基复合材料的研究方向。     

高阻尼金属基复合材料的发展途径

本文在综述传统的高阻尼金属材料和金属基复合材料的阻尼特性基础上，探讨获得高阻尼金属基复合材料的途径，指出采用高阻尼的基体合金、采用高阻尼的增强体以及设计高阻尼的界面层是三种有效方法，为发展密度更小同时又兼有优良机械性能和阻尼功能的新型金属基复合材料提供了可能。     

数值模拟碳纳米管增强铝基复合材料的力学性能

本文根据连续介质理论,采用代表性体积元的方法计算了碳纳米管增强铝基复合材料的力学性能。使用有限元软件ABAQUS对代表性体积元模型进行分析,研究了不同碳纳米管体积分数对复合材料弹性模量、屈服强度、泊松比及剪切模量的影响。结果表明碳纳米管体积分数对复合材料力学性能有显著影响,随着碳纳米管体积分数的增加,复合材料的弹性模量、屈服强度及剪切强度都明显提高,泊松比略有下降。     

金属基复合材料焊接技术及其发展动向

本文参阅了大量外文文献，对国外在金属基复合材料焊接技术上的研究现状及其发展动向作了综述与评价，主要讨论了熔化焊、扩散焊、钎焊、瞬时液相焊、电阻焊及电容储能点焊在复合材料焊接应用中目前所存在的问题及相应的解决措施。特别对瞬时液相焊作了重要介绍与推荐。     

金属基复合材料的热循环行为

本文参阅了大量文献，对国外金属基复合材料的热循环行为的研究现状进行了综述与评价，主要讨论了热循环对复合材料的性能与结构的影响，并初步探讨了热循环造成破坏的机制。     

金属离子源磁过滤器磁场位形的设计与实验研究

根据磁过滤器对磁场的要求,利用水冷铜管产生的反向磁场,设计一个轴向磁场较弱的磁镜式磁过滤器.由数值模拟和实验研究的结果可知:磁过滤器磁场位形是一个轴向较弱的磁镜式磁场分布;并且在磁过滤器的出口处,磁场强度的均匀性较好;还增强了水冷铜管和磁过滤器壁之间的磁场.由离子束测试实验可知在加反向磁场时离子束的均匀性比没有反向磁场时高很多.     

Wear Studies on Metal Matrix Composites: a Taguchi Approach

1. IntroductionDiscontinuously reinforced aluminium metal matrixcomposites (DRAMMCs) are a class of composite materi-als, which have desirable properties including low density,high specific stiffness, high specific strength, controlledco-efficient of thermal expansion, increased fatigue re-sistance, superior dimensional stability at elevated tem-peratures etc[1]. The most commonly employed metalmatrix composite system consists of aluminium alloy re-inforced with hard ceramic particles usuall…     

A Power Spectrum Analysis of Surface Generation in Ultraprecision Machining of Al/SiC Metal Matrix Composites

Metal matrix composites (MMCs) are well known to be difficult-to-machine materials in ultraprecision machining. To have a better insight into the physical mechanisms involved in the cutting process, a power spectrum analysis is proposed to study the surface generation in ultraprecision machining of aluminiumsilicon carbide MMCs. The results indicate that the power spectrum of a surface roughness profile is correlated well to different process parameters and mechanisms of surface generation. The findings help to formulate the optimum cutting strategy for machining the MMCs.     

莫来石基复合材料的研究进展

由于莫来石材料的韧性、超塑性等性能较差，往往不能满足作为耐火材料、电子封装材料和光学材料等在工业中的使用要求，因而限制了它的进一步应用。本文就莫来石与堇青石、ZrO2、CNT、高硅氧玻璃、连续性纤维等改性制得莫来石基复合材料的研究进展现状进行了介绍，同时对它的发展前景进行了分析。