scholarly journals Classification of Structure Defects of Metal Matrix Castings with Saturated Reinforcement

2012 ◽  
Vol 12 (3) ◽  
pp. 29-36
Author(s):  
K. Gawdzińska ◽  
D. Nagolska ◽  
M. Szweycerb
Keyword(s):  
Metal Matrix Composite ◽  
Matrix Composite ◽  
Metal Matrix ◽  
Cast Steel ◽  
Environment Protection ◽  
Ferrous Alloys ◽  
Structure Defects ◽  
Definition Of

Abstract Definition of a composite [1] describes an ideal composite material with perfect structure. In real composite materials, structure is usually imperfect - composites contain various types of defects [2, 3-5], especially as the casted composites are of concern. The reason for this is a specific structure of castings, related to course of the manufacturing process. In case of metal matrix composite castings, especially regarding these manufactured by saturation, there is no classification of these defects [2, 4]. Classification of defects in castings of classic materials (cast iron, cast steel, non-ferrous alloys) is insufficient and requires completion of specific defects of mentioned materials. This problem (noted during manufacturing metal matrix composite castings with saturated reinforcement in Institute of Basic Technical Sciences of Maritime University Szczecin) has become a reason of starting work aimed at creating such classification. As a result, this paper was prepared. It can contribute to improvement of quality of studied materials and, as a consequence, improve the environment protection level.

scholarly journals Study on Vibration Tapping for SiCp/Al Particle-reinforced Metal Matrix Composite

2018 ◽  
Vol 228 ◽  
pp. 04005
Author(s):  
Yang Liu ◽  
Jing Zhao
Keyword(s):  
Service Life ◽  
Metal Matrix Composite ◽  
Matrix Composite ◽  
Torsional Vibration ◽  
Metal Matrix ◽  
Low Frequency ◽  
Cutting Fluid

Aiming at answering the question that low tap service life of ordinary tapping and bad thread quality on particle-reinforced metal matrix composite SiCp/Al, the reason of question and the mechanism of low-frequency torsional vibration tapping are analyzed. The experiments were carried out to compare the tap service life and the thread quality of vibration tapping with ordinary tapping without cutting fluid. It indicates that vibration tapping could make tapping torque reduce greatly, the tap service life could be prolonged twice comparing with continuous tapping without cutting fluid, and could ensure the good thread quality. Moreover, it promotes metal matrix composite’s further application.

Pressing and Bonding Strength of Metal Matrix Composite

2019 ◽  
Vol 814 ◽  
pp. 19-26
Author(s):  
Ya Chun Dai ◽  
Hai Wang ◽  
Chao Yang ◽  
Ding Jiang
Keyword(s):  
Metal Matrix Composite ◽  
Matrix Composite ◽  
Process Parameters ◽  
Shot Peening ◽  
Bonding Strength ◽  
Metal Matrix ◽  
Cast Steel ◽  
High Energy ◽  
Test Scheme ◽  
Steel Shot

This article aims to improve the bonding strength between metal and plastic,the metal substrate is subjected to high-energy shot peening to make the surface self-nitrified, and the orthogonal test scheme was designed based on the process parameters of high energy shot peening and spraying. After molding, the bonding strength of the metal matrix composite was tested by the vertical stretching method. We studied the effect of the cast steel shot diameter, the shot peening pressure, the shot peening time and the plasticizing temperature on the bonding strength of the composite. The combination of process parameters was determined when the bonding strength was optimized, then use the numerical fitting method to predict the combination of process parameters when the bonding strength is the highest, the optimization results are verified by experiments. The results show that the diameter of the cast steel shot is 4.96mm-5.04mm, the shot peening pressure is 0.49MPa-0.51MPa, the shot peening time is 10.9min-11.08min, and the plasticizing temperature is 278.2°C-282°C. The bonding strength of the composite is optimal Keywords: Metal matrix composite, High-energy shot peening, Press forming; Bonding strength, Process optimization

Effect of Material and Technological Conditions on Quality of Metal Matrix Composite Castings

2013 ◽  
Vol 197 ◽  
pp. 180-185 ◽  
Author(s):  
Katarzyna Gawdzińska ◽  
Dorota Nagolska ◽  
Leszek Wojnar
Keyword(s):  
Metal Matrix Composite ◽  
Human Impact ◽  
Technological Process ◽  
Matrix Composite ◽  
Metal Matrix ◽  
Quality Characteristics ◽  
Metal Composite ◽  
Individual Quality ◽  
Ishikawa Diagram

The paper presents a proof, which has been made by analyzing technological process of tested materials, that a set of quality characteristics of metal composite castings has to be different from the set of quality characteristics of castings produced out of traditional materials. However, some characteristics are similar for both material groups. These characteristics (pertaining to a set of quality characteristics of composite castings) that have been named as specific, have not been determined before. The set of characteristics has been determined on the basis of material and technological conditions as well as on methodology of diagnosing the castings quality. Basing on the Ishikawa diagram, weights of individual quality characteristics have been set along with values for particular material and technological causal groups, i.e. management, human impact, methods of manufacturing and material of composite castings and manufacturing workstation.

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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