Interfacial reactions in metal matrix composites revealed by imaging SIMS

1996 ◽  
Vol 54 ◽  
pp. 1048-1049
Author(s):  
R. Levi-Setti ◽  
J.M. Chabala ◽  
W. Wolbach ◽  
K.K. Soni
Keyword(s):  
Metal Matrix Composites ◽  
Metal Matrix ◽  
Secondary Ion Mass Spectrometry ◽  
High Spatial Resolution ◽  
Advanced Materials ◽  
Matrix Composites ◽  
Ceramic Fibers ◽  
Analytical Technique ◽  
Series Of Experiments ◽  
Secondary Ion

Secondary ion mass spectrometry (SIMS), often in its non-imaging manifestation, is a powerful analytical technique that has found numerous applications in the semiconductor, geochemistry and organic chemistry industries. Given its strengths, which often complement those of traditional electron-probe-based analyses, it is surprising that SIMS has not found a larger clientele among Researchers studying engineered and biological materials. To illustrate the power of high-spatial-resolution SIMS for the investigation of advanced materials, we summarize a series of experiments examining the microstructure and microchemistry of alloys reinforced with ceramic fibers. The goals of this presentation are twofold: first, to notify the scientific community about the capabilities of imaging SIMS; and second, to elevate (hopefully) the study of metal-matrix composites via SIMS from an important but obscure engineering pursuit to a thriving profession. The principal advantages of the SIMS technique for this study are i) polished, bulk samples can be analyzed (i.e. thinning is not required); ii) the distribution of most elements and isotopes can be measured with submicrometer resolution; iii) the signal-to-noise is very good (essentially no background).

A review on the intensification of metal matrix composites and its nonconventional machining

2018 ◽  
Vol 25 (2) ◽  
pp. 213-228 ◽  
Author(s):  
Ashish Kumar Srivastava ◽  
Amit Rai Dixit ◽  
Sandeep Tiwari
Keyword(s):  
Metal Matrix Composites ◽  
Metal Matrix ◽  
Hybrid Composites ◽  
Advanced Materials ◽  
Matrix Composites ◽  
Suitable Material ◽  
Specific Strength ◽  
Wear And Corrosion ◽  
New Generation ◽  
Conventional Machining

AbstractMetal matrix composites (MMCs) are the new-generation advanced materials that have excellent mechanical properties, such as high specific strength, strong hardness, and strong resistance to wear and corrosion. All these qualities make MMCs suitable material in the manufacture of automobiles and aircraft. The machining of these materials is still difficult due to the abrasive nature of the reinforced particles and hardness of MMCs. The conventional machining of MMCs results in high tool wear and slow removal of materials, thereby increasing the overall machining cost. The nonconventional machining of these materials, on the contrary, ensures much better performance. This paper reviews various research works on the development of MMCs and the subsequent hybrid composites and evaluates their performances. Further, it discusses the influence of the process parameters of conventional and nonconventional machining on the performance of MMCs. At the end, it identifies the research gaps and future scopes for further investigations in this field.

Investigation on Machining of Hybrid Metal Matrix Composite

2019 ◽  
Vol 969 ◽  
pp. 846-851
Author(s):  
Anil Kumar Bodukuri ◽  
Kesha Eswaraiah ◽  
V. Pradeep
Keyword(s):  
Metal Matrix Composite ◽  
Metal Matrix Composites ◽  
Matrix Composite ◽  
Metal Matrix ◽  
Advanced Materials ◽  
Matrix Composites ◽  
Hybrid Metal Matrix Composites ◽  
Hybrid Metal Matrix Composite ◽  
Pulse On Time ◽  
Pulse Off Time

Hybrid metal matrix composites (HMMC) are advanced materials which are not simply depicting in improvement of mechanical properties but also on characteristics of machinability for thorny shapes to machine. Electric discharge machining (EDM) shows a potential technique for machining hybrid metal matrix composites. An investigation is done on hybrid metal matrix composite for response parameters like MRR, TWR by conducting a range of experiments with choosing typical process parameters such as peak current, tool lift, pulse-on time and pulse-off time.

Improved Performance in Aerospace Structures with Ti and Ni Metal Matrix Composites

2012 ◽  
Vol 706-709 ◽  
pp. 240-245 ◽  
Author(s):  
Claudio Testani ◽  
Mario Tului
Keyword(s):  
Metal Matrix Composites ◽  
Metal Matrix ◽  
Matrix Composites ◽  
Nickel Superalloys ◽  
Ceramic Fibers ◽  
Strengthening Phase ◽  
Improved Performance ◽  
Critical Regions ◽  
Supersonic Vehicles ◽  
Resistant Ceramic

The external structures of supersonic vehicles are exposed in several critical regions to temperatures that could reach 1000°C. This limit is higher than any safe operative service not only for titanium alloys but also for commercial nickel superalloys. The simplest way to improve titanium and nickel matrices temperature behavior (i.e: strength and fatigue resistance) is to introduce a strengthening phase in its matrix. These class of materials are known as: Metal Matrix Composites (MMC). It is possible reinforce both titanium and nickel superalloys by mean of high temperature resistant ceramic fibers.

Process Control For Composites Using Computed Tomography

1990 ◽  
Vol 217 ◽  
Author(s):  
Philip Engler ◽  
William D. Friedman ◽  
Mark W. Santana ◽  
Frank Chi
Keyword(s):  
Computed Tomography ◽  
Metal Matrix Composites ◽  
Metal Matrix ◽  
Squeeze Casting ◽  
Structural Information ◽  
Casting Process ◽  
Matrix Composites ◽  
Ceramic Fibers ◽  
Fiber Concentration ◽  
Complicated Part

ABSTRACTStructural information provided by computed tomography (CT) can be used for quality control and optimization of processes for manufacturing better materials. The squeeze casting method for producing metal matrix composites involves infiltrating a preform of ceramic fibers with molten metal under high pressure. Part quality can be improved if CT is used before infiltration to determine if the preforms have the desired distribution of fibers and are free of defects. Measurements do not require uniform shapes, and CT systems can even be used to obtain accurate densities on complicated part shapes that are not amenable to bulk density measurements based on weight and size. With this quantitative distribution information as a guide, preform production can be modified to produce either a more uniform fiber distribution or to selectively increase the fiber concentration in critical areas. Problems occurring during later stages of processing can be detected in CT images of the completed part. For example. CT can be used to detect unreinforced regions in metal matrix composites caused by cracking of the preform during the squeeze casting process. CT scans of completed parts can also detect and distinguish variations in structure such as microporosity.

The role of TEM in the development of advanced materials

1990 ◽  
Vol 48 (4) ◽  
pp. 176-177
Author(s):  
M H Loretto
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Metal Matrix Composites ◽  
Metal Matrix ◽  
Advanced Materials ◽  
Matrix Composites ◽  
X Ray Diffraction ◽  
Transmission Electron ◽  
The Matrix ◽  
Scanning Electron

In general the microstructural assessment of advanced materials can be satisfactorily assessed using optical and scanning electron microscopy together with X-ray diffraction. Transmission electron microscopy (TEM) is used only when the scale and nature of the information which can be obtained from TEM is appropriate. The aim of the present article is to highlight some examples of the unique role that TEM has played in the field of structural materials. Four areas will be discussed: metal matrix composites; precipitation in Al-Li based alloys; rapid solidification; intermetallics.In the field of metal-matrix composites one of the most important aspects is nature of the bonding and interaction between the reinforcement and the matrix, and this is an area where the spatial resolution of analytical TEM is required in order to characterise any interaction. The recent work on Ti6A14V/TiC and Ti24All INb/TiC composites has illustrated this very clearly. Even after heat treatments of 50h at 1100°C the TiC appears to be unaffected as assessed by both optical and scanning electron microscopy. Only when TEM is used is it possible to see that there has been any interaction.

An overview of diversified reinforcement on aluminum metal matrix composites: Tribological aspects

2016 ◽  
Vol 231 (3) ◽  
pp. 399-421 ◽  
Author(s):  
Jitendra M Mistry ◽  
Piyush P Gohil
Keyword(s):  
Metal Matrix Composites ◽  
Metal Matrix ◽  
Cylinder Block ◽  
Research Review ◽  
Matrix Composites ◽  
Analytical Technique ◽  
Piston Cylinder ◽  
Aluminum Metal ◽  
Future Work ◽  
Aluminum Metal Matrix Composites

Aluminum metal matrix composites have found applications in manufacturing of various components such as piston, cylinder block, and brake drum, in which wear and friction are important phenomenon. This paper presents an overview of diversified reinforcement on aluminum metal matrix composites in terms of tribological aspects. A comprehensive literature review is carried out on aluminum metal matrix composites based on individual reinforcement and multiple reinforcements including various product applications. The research review is summarized in form of tribology wheel for aluminum metal matrix composites, which encompass fields involved in tribology, fabrication processes/parameters, reinforcement(s) and matrix contribution, tribological testing parameter, statistical analytical technique, and product application areas of AMCs. The tribology wheel becomes helpful in selecting parameters with possible permutation and combination for further improvement of tribological properties. Finally, comments are addressed regarding the future work on tribological aspects of aluminum metal matrix composites.

Electron Microscopy of Metal-Matrix Composites

1970 ◽  
Vol 28 ◽  
pp. 404-405
Author(s):  
A. Lawley ◽  
M. R. Pinnel ◽  
A. Pattnaik
Keyword(s):  
Electron Microscopy ◽  
Metal Matrix Composites ◽  
Metal Matrix ◽  
Critical Evaluation ◽  
Elastic Behavior ◽  
Matrix Composites ◽  
Directionally Solidified ◽  
Fracture Characteristics ◽  
Broad Program

As part of a broad program on composite materials, the role of the interface on the micromechanics of deformation of metal-matrix composites is being studied. The approach is to correlate elastic behavior, micro and macroyielding, flow, and fracture behavior with associated structural detail (dislocation substructure, fracture characteristics) and stress-state. This provides an understanding of the mode of deformation from an atomistic viewpoint; a critical evaluation can then be made of existing models of composite behavior based on continuum mechanics. This paper covers the electron microscopy (transmission, fractography, scanning microscopy) of two distinct forms of composite material: conventional fiber-reinforced (aluminum-stainless steel) and directionally solidified eutectic alloys (aluminum-copper). In the former, the interface is in the form of a compound and/or solid solution whereas in directionally solidified alloys, the interface consists of a precise crystallographic boundary between the two constituents of the eutectic.

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