金属基复合材料检验方法研究现状

本文总结了现有金属基复合材料检验方法,针对化学、力学和物理性能的检验方法及研究现状进行了分析,并探讨现行金属材料国家标准对金属基复合材料的适用性.     

金属基复合材料的现状与发展趋势

在过去的二十多年里,金属基复合材料凭借其结构轻量化和优异的耐磨、热学和电学性能,逐渐在陆上运输(汽车和火车)、热管理、民航、工业和体育休闲产业等诸多领域实现商业化的应用,确立了作为新材料和新技术的地位。但是,金属基复合材料的未来发展仍然面临不确定性,既有可能持续扩大应用领域和市场规模,也有可能在其它材料和技术的竞争下停滞甚至萎缩。在综述金属基复合材料的研究与应用现状的基础上,对其可预期的增长点和发展趋势进行了展望。     

喷射沉积金属基复合材料的研究现状与发展趋势

喷射沉积是制备金属基复合材料的一种较为理想的工艺方法。综述了喷射沉积在该领域内的研究成果与进展，概述了其基本原理与应用状况，对今后的发展动向提出一些新的看法。     

金属基原位复合材料的特征与进展

本文综述了金属基原位复合材料的特点，对该复合材料的结构和机械性能进行了分析，并简要诗集了其发展趋势。     

金属基复合材料再生与回收研究现状

对金属基复合材料的再生和回收研究现状进行了综述和分析。     

金属基复合材料界面问题

金属基复合材料都要在基体合金熔点附近的高温下制备。在制备过程中，纤维，晶须、颗粒等增强体与基体净发生程度不同的相互作用和界面反应，形成各种结构的界面。界面结构和性能对金属基复合材料的的性能起着决定性作用，深入研究的掌握界面反应和界面影响性能的规律，有效地控制界面的结构和性能，是获得高性能金属基复合材料的关键。     

金属基复合材料的发展现状及展望

介绍了金属基复合材料的发展现状,重点介绍了几种制备金属基复合材料的方法,提出了一种新的制备方法块体分散法,并指出了在制备技术中存在的主要问题及其对应问题的解决方法,最后展望了金属基复合材料的发展趋势.     

Recycling of Metal Matrix Composites

Fundamental ideas of recycling of metal matrix composites are introduced. Two fundamentally different ways for separating reinforcements from the matrix metal exist. One is the mechanical method and another is the chemical method. In this report the separation of fibers in an aluminum matrix composite is demonstrated by a chemical method.     

半固态金属基复合材料的制备及流变性研究进展

简述了用半固态加工工艺制备金属基复合材料的主要方法及原理.讨论了制备过程中各工艺参数对材料制备的影响及后续的触变成形加工.综合评述了半固态金属基复合材料的流变性研究现状.     

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.     

Abrasive Blasting of Metal Matrix Composites

This paper investigates the feasibility of dry erosion by blasting alumina erodent on aluminum composite reinforced with silicon carbide particles. The erosion rate is dependent on the erodent velocity and the matrix hardness. Two different material removal mechanisms are observed due to different attack angles. Blasting between 30-60° is recommended for optimum erosion rate and surface quality. Material removal mechanisms and surface quality of blasted and ground composites are compared. Although its erosion rate is two orders of magnitude less than that for rough grinding, dry blasting is suitable as a finishing process of composites with irregular contours.     

Joining of Aluminium Metal Matrix Composites

Aluminium metal matrix composites (AlMMCs) offer several advantages relative to monolithic aluminium alloys such as high stiffness, strength, wear resistance, low thermal expansion coefficient, etc. However, despite considerable improvements in developing AlMMCs, the lack of reliable joining methods restrict their greater application. Fusion welding of AlMMCs has not proved successful because high temperature nature of the process normally causes unfavorable reactions between the reinforcement and the matrix, leading to the formation of a variety of defects. On the other hand, solid-state welding and diffusion bonding may not be suitable due to the presence of chemically stable surface layer of aluminium oxide, which, being insoluble in aluminium, inhibits metal-to-metal contact during diffusion bonding. Furthermore, diffusion bonding requires a very smooth and clean contact surface, which is difficult to obtain in industrial applications. As an alternative, transient liquid phase (TLP) diffusion bonding, which operates at a lower temperature, can be used to circumvent the problems associated with the oxide layer. The formation of liquid phase (eutectic) can assist the disruption of the oxide layer and promote metallic contact. The composite material used in the present study consisted of 6061 alloy containing 15 volume % of SiC particulates of 23 μm diameter. TLP bonding was carried out at 560 ˚C in argon atmosphere using copper as an interlayer with different pressures and holding times. TLP-bonded AlMMCs were characterized by optical and scanning electron microscopy, microhardness survey, and shear tests. The results indicated that adequate bond strength could be achieved with suitable bonding parameters such as holding time and initial pressure.     

Fatigue Behaviour of Metal Matrix Composites

Based mainly on the work done at the authors'laboratory in recent years,this paper examines whatis currently known about the cyclic deformationand fatigue properties of metal matrix composites,with particular emphasis on discontinuous fiber(whisker or particulate)-reinforced Al composites.The following items are discussed:fatigue strengthand life,cyclic deformation and microstructuralevolution,microcrack initiation and growth,fatiguecrack propagation behaviour.     

Analysis of Surface Integrity in Drilling Metal Matrix and Hybrid Metal Matrix Composites

Hybrid metal matrix composites consist of at least three constituents-a metal or an alloy matrix and two reinforcements in various forms, bonded together at the atomic level in the composite. Despite their higher specific properties of strength and stiffness, the non homogeneous and anisotropic nature combined with the abrasive reinforcements render their machining difficult. In this paper, the surface integrity of machining in drilling hybrid composites has been discussed. Drilling tests are carried out at different spindle speed, feed rates, and different drill tool materials to investigate the effect of the various cutting parameters on the surface quality and the extent of the deformation of drilled surface due to drilling. Materials used for the present investigation are Al356/10SiC (wt%) metal matrix and Al356/10SiC-3mica (wt%) hybrid composites. The composites are fabricated using stir casting route. The drilling tests are conducted on vertical computer numeric control (CNC) machining center using carbide, coated carbide and polycrystalline diamond (PCD) drills. The surface roughness decreases with increasing spindle speed and increases with increasing feed rate. The machined surface is analyzed by scanning electron microscopy (SEM). SEM images of the machined surfaces indicate the presence of grooves and pits. Microhardness depth profiles indicate that the subsurface damage is limited to the top of 100-250 μm.     

金属基复合材料研究进展

本文对金属基复合材料目前的进展进行了综述,内容包括增强体、基体及各种金属基复合材料;新的加工技术和应用,以及有关金属基复合材料的界面行为,力学性能和破坏过程的研究情况,特别着重介绍了国内的研究工作,对金属基复合材料在今后的发展中如何充分发挥潜力也作了设想。