Dislocation Punching From Ceramic/Metal Interfaces

1994 ◽  
Vol 116 (3) ◽  
pp. 408-413 ◽  
Author(s):  
M. Taya ◽  
T. Mori
Keyword(s):  
Metal Matrix Composite ◽  
Analytical Model ◽  
Matrix Composite ◽  
Metal Matrix ◽  
Composite System ◽  
Filler Metal ◽  
Experimental Results ◽  
Ceramic Filler ◽  
Metal Interfaces ◽  
Good Agreement

Relaxation of misfit strains at interfaces between two different materials by dislocation punching is studied analytically by focusing on two types of interfaces: planar and nonplanar. As an example of planar type interface, the case of metal coating/ ceramic substrate system is studied while ceramic filler/metal matrix composite system is examined as an example of a nonplanar interface. Based on the present analytical model, the condition for dislocation punching for each interface is established. Validity of the dislocation punching model is verified by comparing the analytical results with limited experimental results, resulting in a good agreement.

Multi-scale dynamic analysis of metal matrix composite shafts through morphological evaluations

2021 ◽  
pp. 095440892110421
Author(s):  
Anuj Sharma ◽  
Atul Kumar Agrawal ◽  
Vikas Rastogi ◽  
Ashish Gupta
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Metal Matrix Composite ◽  
Matrix Composite ◽  
Metal Matrix ◽  
Effective Properties ◽  
Experimental Results ◽  
Micromechanical Modeling ◽  
Average Particle ◽  
Scanning Electron

This paper reports the methodology for predicting the effective dynamic properties of metal matrix composite long and slender shafts. Stir casting process was employed to manufacture metal matrix composite shafts with alumina as reinforcement and aluminum 6061 as matrix material. Microstructural images for unetched samples were scanned through scanning electron microscopy. The presence of particles was confirmed through energy-dispersive X-ray spectroscopy analysis. Parameters such as aspect ratio, reinforcement percentage, and the average particle size of the reinforcement were determined through the image processing of scanning electron microscopy images. The effective properties of these composites have been predicted through micromechanical modeling by using these parameters. These properties were employed to calculate dynamic parameters computationally. These results were compared with analytical results, along with experimental results that were recorded and analyzed by u'sing a digital vibration analyzer OROS36®. This novel approach of predicting the results of specific modulus and the natural frequency of the shaft by using exact morphological parameters provided fewer errors when compared with experimental results.

TEM examination of 2014-SiC metal matrix composite

1988 ◽  
Vol 46 ◽  
pp. 726-727
Author(s):  
M. G. Burke ◽  
M. N. Gungor ◽  
P. K. Liaw
Keyword(s):  
Metal Matrix Composite ◽  
Metal Matrix Composites ◽  
Matrix Composite ◽  
Metal Matrix ◽  
Tensile Deformation ◽  
Microstructural Characterization ◽  
Thin Foil ◽  
Matrix Alloy ◽  
Matrix Composites ◽  
Ion Milling

Aluminum-based metal matrix composites offer unique combinations of high specific strength and high stiffness. The improvement in strength and stiffness is related to the particulate reinforcement and the particular matrix alloy chosen. In this way, the metal matrix composite can be tailored for specific materials applications. The microstructural characterization of metal matrix composites is thus important in the development of these materials. In this study, the structure of a p/m 2014-SiC particulate metal matrix composite has been examined after extrusion and tensile deformation.Thin-foil specimens of the 2014-20 vol.% SiCp metal matrix composite were prepared by dimpling to approximately 35 μm prior to ion-milling using a Gatan Dual Ion Mill equipped with a cold stage. These samples were then examined in a Philips 400T TEM/STEM operated at 120 kV. Two material conditions were evaluated: after extrusion (80:1); and after tensile deformation at 250°C.

An appraisal of characteristic mechanical properties and microstructure of friction stir welding for Aluminium 6061 alloy – Silicon Carbide (SiCp) metal matrix composite

2019 ◽  
Vol 13 (4) ◽  
pp. 5804-5817
Author(s):  
Ibrahim Sabry
Keyword(s):  
Tensile Strength ◽  
Ultimate Tensile Strength ◽  
Metal Matrix Composite ◽  
Matrix Composite ◽  
Metal Matrix ◽  
Welded Joint ◽  
Rotation Speed ◽  
Fusion Welding ◽  
Friction Stir ◽  
Al 6061

It is expected that the demand for Metal Matrix Composite (MMCs) will increase in these applications in the aerospace and automotive industries sectors, strengthened AMC has different advantages over monolithic aluminium alloy as it has characteristics between matrix metal and reinforcement particles.  However, adequate joining technique, which is important for structural materials, has not been established for (MMCs) yet. Conventional fusion welding is difficult because of the irregular redistribution or reinforcement particles.  Also, the reaction between reinforcement particles and aluminium matrix as weld defects such as porosity in the fusion zone make fusion welding more difficult. The aim of this work was to show friction stir welding (FSW) feasibility for entering Al 6061/5 to Al 6061/18 wt. % SiCp composites has been produced by using stir casting technique. SiCp is added as reinforcement in to Aluminium alloy (Al 6061) for preparing metal matrix composite. This method is less expensive and very effective. Different rotational speeds,1000 and 1800 rpm and traverse speed 10 mm \ min was examined. Specimen composite plates having thick 10 mm were FS welded successfully. A high-speed steel (HSS) cylindrical instrument with conical pin form was used for FSW. The outcome revealed that the ultimate tensile strength of the welded joint (Al 6061/18 wt. %) was 195 MPa at rotation speed 1800 rpm, the outcome revealed that the ultimate tensile strength of the welded joint (Al 6061/18 wt.%) was 165 MPa at rotation speed 1000 rpm, that was very near to the composite matrix as-cast strength. The research of microstructure showed the reason for increased joint strength and microhardness. The microstructural study showed the reason (4 %) for higher joint strength and microhardness.  due to Significant   of SiCp close to the boundary of the dynamically recrystallized and thermo mechanically affected zone (TMAZ) was observed through rotation speed 1800 rpm. The friction stir welded ultimate tensile strength Decreases as the volume fraction increases of SiCp (18 wt.%).

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