scholarly journals Microstructure and Mechanical Behavior of Al-Mg Composites Synthesized by Reactive Sintering

Metals ◽  
2018 ◽  
Vol 8 (10) ◽  
pp. 762 ◽  
Author(s):  
Rub Nawaz Shahid ◽  
Sergio Scudino
Keyword(s):  
Mechanical Properties ◽  
Plastic Deformation ◽  
Yield Strength ◽  
Mechanical Behavior ◽  
Intermetallic Compounds ◽  
Metal Matrix ◽  
Stress Model ◽  
Matrix Composites ◽  
Reactive Sintering ◽  
Powder Mixtures

Lightweight metal matrix composites are synthesized from elemental powder mixtures of aluminum and magnesium using pressure-assisted reactive sintering. The effect of the reaction between aluminum and magnesium on the microstructure and mechanical properties of the composites due to the formation of β-Al3Mg2 and γ-Al12Mg17 intermetallics is investigated. The formation of the intermetallic compounds progressively consumes aluminum and magnesium and induces strengthening of the composites: the yield and compressive strengths increase with the increase of the content of intermetallic reinforcement at the expense of the plastic deformation. The yield strength of the composites follows the iso-stress model when the data are plotted as a function of the intermetallic content.

Paradox of Strength and Ductility in Metals Processed Bysevere Plastic Deformation

2002 ◽  
Vol 17 (1) ◽  
pp. 5-8 ◽  
Author(s):  
R. Z. Valiev ◽  
I. V. Alexandrov ◽  
Y. T. Zhu ◽  
T. C. Lowe
Keyword(s):  
Mechanical Properties ◽  
Plastic Deformation ◽  
Grain Size ◽  
Yield Strength ◽  
Mechanical Behavior ◽  
High Strength ◽  
High Ductility ◽  
Elongation To Failure ◽  
Failure Ductility ◽  
Strength And Ductility

It is well known that plastic deformation induced by conventional forming methodssuch as rolling, drawing or extrusion can significantly increase the strength of metalsHowever, this increase is usually accompanied by a loss of ductility. For example, Fig.1 shows that with increasing plastic deformation, the yield strength of Cu and Almonotonically increases while their elongation to failure (ductility) decreases. Thesame trend is also true for other metals and alloys. Here we report an extraordinarycombination of high strength and high ductility produced in metals subject to severeplastic deformation (SPD). We believe that this unusual mechanical behavior is causedby the unique nanostructures generated by SPD processing. The combination ofultrafine grain size and high-density dislocations appears to enable deformation by newmechanisms. This work demonstrates the possibility of tailoring the microstructures ofmetals and alloys by SPD to obtain both high strength and high ductility. Materialswith such desirable mechanical properties are very attractive for advanced structuralapplications.

Finite Element Analysis for the Transverse Mechanical Behavior of Fiber-Reinforced Three-Phase Metal-Matrix Composites

2005 ◽  
Vol 475-479 ◽  
pp. 3299-3302
Author(s):  
M. Zhang ◽  
W.L. Zhang ◽  
M.Y. Gu
Keyword(s):  
Yield Strength ◽  
Mechanical Behavior ◽  
Metal Matrix Composites ◽  
Metal Matrix ◽  
Material Model ◽  
Parameter Analysis ◽  
Matrix Composites ◽  
Fiber Reinforced ◽  
Three Phase ◽  
Fiber Arrangement

To improve the transverse properties of fiber-reinforced metal matrix composites, a three-phase material model was proposed. In the model the reinforcing fibers are surrounded by a weak metal matrix, which in turn is encircled by another strong metal matrix. The weak matrix acts as a role to protect the fibers from damage and the strong matrix acts as a role to improve the transverse properties of the composite. Based on the material model, FEM model was established and parameter analysis was carried out to determine the influence of matrix strengths and fibers spatial distribution on the transverse mechanical behavior of the three-phase composite. It was found that the yield strength of the three-phase composite was mainly dictated by the matrix directly surrounding fibers and the effect from another matrix on the yield strength can be neglected. The three-phase composite has a higher transverse strength with hexagonal fiber arrangement than with regular square fiber arrangement.

The effect of plastic deformation on mechanical properties of aluminium matrix composites reinforced with 2D crystals

2020 ◽  
Vol 111 (8) ◽  
pp. 632-638
Author(s):  
Jaroslaw Wozniak ◽  
Mateusz Petrus ◽  
Marek Kostecki ◽  
Tomasz Cygan ◽  
Andrzej Olszyna
Keyword(s):  
Mechanical Properties ◽  
Plastic Deformation ◽  
Yield Strength ◽  
Physical And Mechanical Properties ◽  
Compressive Yield Strength ◽  
Multilayer Graphene ◽  
Matrix Composites ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
2D Crystals

Abstract In this study, AA6061 matrix composites reinforced with multilayer graphene and MoS2 were analyzed. The composites were prepared by powder metallurgy using the spark plasma sintering and spark plasma texturing methods. Microstructure, physical and mechanical properties were investigated and compared with unreinforced AA6061 sinter and AA6061 sheet plate. The results showed that the application of spark plasma texturing positively influences the relative density and compressive yield strength of AA6061 matrix composites. Moreover, in composites with MoS2, significant differences in compressive yield strength between the centre and the edge of the sintered compacts were noticed. These differences are related to the formation of the MoAl12 phase as a result of the temperature gradient generated in the graphite die during sintering by the spark plasma texturing.

Metal Matrix Composites from Powder Mixtures of Copper, Tungsten, Aluminum and Nanodiamonds

2012 ◽  
Vol 727-728 ◽  
pp. 320-323 ◽  
Author(s):  
Ana Lúcia Diegues Skury ◽  
G.S. Bobrovinichii ◽  
S.N. Monteiro
Keyword(s):  
Mechanical Properties ◽  
Metal Matrix Composites ◽  
Metal Matrix ◽  
The Other ◽  
Matrix Composites ◽  
Powder Mixtures ◽  
Sintering Conditions ◽  
Al Matrix Composites ◽  
Effective Reinforcement ◽  
Al Matrix

Composites are versatile materials owing to their extensive possibilities of improving mechanical properties by distinct matrix reinforcements. In particular, it has been shown that diamonds are very effective reinforcement for metal matrix composites (MMC). In this work, the properties and microstructure of plain Al matrix composites reinforced with up to 50 wt.% of nanodiamonds as well as Cu, W, Al MMCs reinforced with 1% nanodiamonds were investigated. Composites were fabricated by processing metallic powders of Cu, W and Al as well as nanodiamond particles at sintering conditions of 2 GPa of pressure and 700°C for times up to 5 minutes. As compared to the other nanodiamond reinforced MMCs, the investigated composite presented improved microhardness and reduced wear in abrasive tests.

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