Influence of Distinct Manufacturing Processes on the Microstructure of Ni-Based Metal Matrix Composites Submitted to Long Thermal Exposure

2019 ◽  
Vol 809 ◽  
pp. 79-86
Author(s):  
Georges Lemos ◽  
Márcio C. Fredel ◽  
Florian Pyczak ◽  
Ulrich Tetzlaff
Keyword(s):  
Metal Matrix Composites ◽  
High Temperatures ◽  
Metal Matrix ◽  
Thermal Exposure ◽  
High Energy ◽  
Matrix Composites ◽  
Microstructural Stability ◽  
Aerospace Applications ◽  
Plasma Sintering ◽  
Energy Processes

Metal Matrix Composites (MMCs) are known for their remarkable properties, by combining materials from different classes. Ni-based MMCs are a promising group of heat-resistant materials, targeting aerospace applications. A discontinuously reinforced Inconel X-750/TiC 15 vol.% MMC was proposed for use in lighter, creep resistant turbine elements, with the aim to endure service temperatures up to 1073 K (800 °C). However, their microstructural stability at high temperatures for long periods of time remained to be further investigated. To address this need, specimens were produced by both conventional hot pressing and spark plasma sintering, using powders milled by low and high energy processes, followed by long isothermal aging. The treatments were conducted at 973 and 1073 K, for times between 50 and 1000 hours. The resulting samples were investigated with XRD and EDS techniques for phase analysis. In addition, measurements of hardness were made to monitor changes in mechanical behavior. It was found that, for each different manufacturing process, the amount, distribution and size of γ’ and other precipitates notably vary during the overaging process. Consequently, the amount of elements kept in solid solution also shifted with time. Furthermore, the study shows how distinct initial microstructures, resulting from diverse fabrication processes, differently impact the microstructural stability over long times of exposure to high temperatures.

scholarly journals Wettability in Metal Matrix Composites

Metals ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 1034
Author(s):  
Massoud Malaki ◽  
Alireza Fadaei Tehrani ◽  
Behzad Niroumand ◽  
Manoj Gupta
Keyword(s):  
Metal Matrix Composites ◽  
Metal Matrix ◽  
Aluminum Matrix ◽  
Interfacial Strength ◽  
High Strength ◽  
Aluminum Matrix Composites ◽  
Matrix Composites ◽  
Metal Matrix Nanocomposites ◽  
Aerospace Applications ◽  
Matrix Nanocomposites

Metal matrix composites (MMCs) have been developed in response to the enormous demand for special industrial materials and structures for automotive and aerospace applications, wherein both high-strength and light weight are simultaneously required. The most common, inexpensive route to fabricate MMCs or metal matrix nanocomposites (MMNCs) is based on casting, wherein reinforcements like nanoceramics, -carbides, -nitrides, elements or carbon allotropes are added to molten metal matrices; however, most of the mentioned reinforcements, especially those with nanosized reinforcing particles, have usually poor wettability with serious drawbacks like particle agglomerations and therefore diminished mechanical strength is almost always expected. Many research efforts have been made to enhance the affinity between the mating surfaces. The aim in this paper is to critically review and comprehensively discuss those approaches/routes commonly employed to boost wetting conditions at reinforcement-matrix interfaces. Particular attention is paid to aluminum matrix composites owing to the interest in lightweight materials and the need to enhance the mechanical properties like strength, wear, or creep resistance. It is believed that effective treatment(s) may enormously affect the wetting and interfacial strength.

Spark plasma sintering of Ti6Al4V metal matrix composites: Microstructure, mechanical and corrosion properties

2021 ◽  
Vol 865 ◽  
pp. 158875
Author(s):  
Neera Singh ◽  
Raghunandan Ummethala ◽  
Phani Shashanka Karamched ◽  
Rathinavelu Sokkalingam ◽  
Vasanth Gopal ◽  
...  
Keyword(s):  
Metal Matrix Composites ◽  
Spark Plasma Sintering ◽  
Metal Matrix ◽  
Matrix Composites ◽  
Corrosion Properties ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Mechanical And Corrosion Properties

Fluid-Structural Interaction Analysis of the MMC-Thixoforging Process

2006 ◽  
Vol 116-117 ◽  
pp. 591-595
Author(s):  
Mathias Liewald ◽  
Peter Unseld ◽  
M. Schneider
Keyword(s):  
Metal Matrix Composites ◽  
Metal Matrix ◽  
Interaction Analysis ◽  
Rheological Behaviour ◽  
Woven Fabrics ◽  
Special Focus ◽  
Matrix Composites ◽  
Matrix Metal ◽  
Infiltration Process ◽  
Aerospace Applications

High mechanical properties in combination with low density are key features for lightweight constructions in automotive and aerospace applications. The combination between the innovative thixoforging process and the potential of fibre or particle strengthened composites with metallic matrices (MMCs) provides an efficient manufacturing process of structural components with continuous or gradient reinforcements. The scope of the Center of Competence for Casting and Thixoforging Stuttgart (CCT) contains new semi-solid manufacturing methods for metal matrix composites which have been developed and applied for patent pending. While previous research projects were focussed on fabrication of continuous fibre reinforced metal matrix composites, the local reinforcement insertion, located in the center of high force and torsion load zones, is going to be the next evolution step of the CCT research team. Therefore it is essential to verify, to simulate and to reproduce the process during infiltration of the semi-sold matrix metal into the textile layer experimentally. This paper illustrates investigations regarding the infiltration process of the thixotropic cast-alloys AlSi7Mg0.3 (A365) into laminated fibre woven fabrics by computational fluid dynamics and fluid-structure interaction analysis, taking account into specific manufacturing technology, the rheological behaviour of the alloy with special focus on infiltration behavior.

Visual and Cognitive Analysis of Multivariate Data for Characterizing Al/Sic Metal Matrix Composites

2019 ◽  
pp. 72-81
Author(s):  
Alexander Ya. Alexander Ya. Pak ◽  
Alyona A. Zakharova ◽  
Alexei V. Shklyar ◽  
Tatyana A. Pak
Keyword(s):  
Thermal Conductivity ◽  
Metal Matrix Composites ◽  
Metal Matrix ◽  
Multivariate Data ◽  
Maximum Level ◽  
Dimensional System ◽  
Matrix Composites ◽  
Visualization System ◽  
Plasma Sintering ◽  
Spark Plasma

The work shows the results of the literature review of the methods for obtaining aluminiumsilicon carbide - metal matrix composites (Al/ SiC MMCs). This work also includes the collection, analysis, and systemization of the literature data where textual information is presented as a single lexical and semantic system and where numeral information is presented as a dimensional system. The analysis of the literature data was conducted by visual and cognitive modelling, so that methods of forming Al/SiC MMCs and operating parameters that provide the best properties of the material (maximum level of thermal conductivity and minimum level of thermal linear expansion) are determined. Compared to the literature data, the data are presented that were received in a series of tests for obtaining Al/SiC MMCs with spark plasma sintering from SiC, which was synthesized in atmospheric electric arc plasma. Within the framework of the given subject, the authors do not know any analogues of such an analysis and visualization system that allows us to analyse multivariate data, which is essential for solving issues of finding a correlation for the variety of initial parameters that characterize the process of obtaining Al/SiC MMCs and that characterize the cluster of properties for the obtained material. The comparison data are given for thermal conductivity levels of modern (aluminium) LED light devices and Al/SiC MMC samples.

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