Hardness and tensile strength of zircon particles and TiB 2 reinforced Al-A356.1 alloy matrix composites: comparative study

2007 ◽  
Author(s):  
K. Shirvani Moghaddam ◽  
H. Abdizadeh ◽  
H. R. Baharvandi ◽  
N. Ehsani ◽  
F. Abdi
Keyword(s):  
Tensile Strength ◽  
Comparative Study ◽  
Matrix Composites ◽  
Alloy Matrix ◽  
Zircon Particles

scholarly journals Microstructure and Tensile Properties of Graphene-Oxide-Reinforced High-Temperature Titanium-Alloy-Matrix Composites

Materials ◽  
2020 ◽  
Vol 13 (15) ◽  
pp. 3358 ◽  
Author(s):  
Hang Chen ◽  
Guangbao Mi ◽  
Peijie Li ◽  
Xu Huang ◽  
Chunxiao Cao
Keyword(s):  
Tensile Strength ◽  
Titanium Alloy ◽  
Graphene Oxide ◽  
High Temperature ◽  
Yield Strength ◽  
Room Temperature ◽  
Second Phase ◽  
Matrix Composites ◽  
Alloy Matrix ◽  
The Matrix

In this study, graphene-oxide (GO)-reinforced Ti–Al–Sn–Zr–Mo–Nb–Si high-temperature titanium-alloy-matrix composites were fabricated by powder metallurgy. The mixed powders with well-dispersed GO sheets were obtained by temperature-controlled solution mixing, in which GO sheets adsorb on the surface of titanium alloy particles. Vacuum deoxygenating was applied to remove the oxygen-containing groups in GO, in order to reduce the introduction of oxygen. The compact composites with refined equiaxed and lamellar α phase structures were prepared by hot isostatic pressing (HIP). The results show that in-situ TiC layers form on the surface of GO and GO promotes the precipitation of hexagonal (TiZr)6Si3 particles. The composites exhibit significant improvement in strength and microhardness. The room-temperature tensile strength, yield strength and microhardness of the composite added with 0.3 wt% GO are 9%, 15% and 27% higher than the matrix titanium alloy without GO, respectively, and the tensile strength and yield strength at 600 °C are 3% and 21% higher than the matrix alloy. The quantitative analysis indicates that the main strengthening mechanisms are load transfer strengthening, grain refinement and (TiZr)6Si3 second phase strengthening, which accounted for 48%, 30% and 16% of the improvement of room-temperature yield strength, respectively.

Friction Welding of Particle Reinforced Aluminium Based Composites

2011 ◽  
Vol 678 ◽  
pp. 85-93 ◽  
Author(s):  
Lorella Ceschini ◽  
Alessandro Morri ◽  
Fabio Rotundo
Keyword(s):  
Tensile Strength ◽  
Metal Matrix Composites ◽  
Friction Welding ◽  
Metal Matrix ◽  
Frictional Heating ◽  
Fusion Welding ◽  
Matrix Composites ◽  
Alloy Matrix ◽  
Friction Stir ◽  
Welding Processes

The widespread use of metal matrix composites (MMC) is often limited due to the difficulties related to their joining by means of traditional fusion welding processes. The aim of this work was to evaluate the effect on microstructure and mechanical properties (hardness and tensile strength) of two different friction welding techniques used for joining two Al-based metal matrix composites. In particular, Friction Stir Welding was applied to a 6061 (Al-Mg-Si) alloy matrix, reinforced with 20vol.% of Al2O3particles (W6A20A), while Linear Friction Welding was applied to a 2124 (Al-Cu-Mg) alloy matrix reinforced with 25vol.% of SiC particles (AMC225xe). Both the welding processes permitted to obtain substantially defect-free joints, whose microstructures was found to be dependent on both the initial microstructure of the composites and the welding processes. Hardness decrease was in the order of 40% for the FSW joint and of 10% for the LFW joint, mainly due to overaging of the matrix induced by the frictional heating, while the joint efficiency in respect to the ultimate tensile strength was 72% and 82%, respectively. Elongation to failure increased in the FSW joint due to coarsening of precipitates, whereas it decreased in the LFW joints due to the fibrosity in the thermomechanically altered zone. Fracture surface analysis showed good matrix/reinforcement interface for both composites.

Microstructure and Properties of In-Situ Synthesized (Al3Zr+Al2O3)p/A356 Composites

2003 ◽  
Vol 17 (08n09) ◽  
pp. 1292-1296 ◽  
Author(s):  
Y. T. Zhao ◽  
Q. X. Dai ◽  
X. N. Cheng ◽  
S. C. Sun
Keyword(s):  
Tensile Strength ◽  
Crystal Surface ◽  
Reaction System ◽  
A356 Alloy ◽  
Maximum Size ◽  
Matrix Composites ◽  
Alloy Matrix ◽  
Growth Phenomenon ◽  
The Matrix

A novel in-situ reaction system Al-Zr-O was developed. In-situ Al3Zr and Al 2 O 3 particulate reinforced A356 alloy matrix composites have been fabricated by direct melt reaction method. The results show that the maximum size of Al3Zr and Al 2 O 3 particulate synthesized in the system ZrOCl2-A356 is 1um and 3um respectively, and they are well distributed in the matrix. The investigation shows that Al3Zr crystal is in the shape of polyhedron and rectangle. There is a faceted growth phenomenon on Al3Zr crystal surface. It is firstly found that the Al3Zr crystal grows in the mechanism of twin. The twin plane is [Formula: see text], and the twinning direction is [Formula: see text]. The crystal morphology of in-situ[Formula: see text] particulate is rectangle or sphere. Furthermore. ( Al 3 Zr+Al 2 O 3) p / A356 composites have not only higher tensile strength at room temperature (376.2MPa) but also higher yield strength (319.4MPa) and higher tensile strength at elevated temperature (200°C) than that of A356 alloy.

Evaluation of Mechanical Properties of Aluminum Alloy (Al2024) Reinforced with Silicon Carbide (SiC) Metal Matrix Composites

2017 ◽  
Vol 263 ◽  
pp. 184-188 ◽  
Author(s):  
P. Subramanya Reddy ◽  
R. Kesavan ◽  
B. Vijaya Ramnath
Keyword(s):  
Mechanical Properties ◽  
Silicon Carbide ◽  
Tensile Strength ◽  
Aluminum Alloy ◽  
Base Alloy ◽  
Stir Casting ◽  
Matrix Composites ◽  
Alloy Matrix ◽  
Casting Technique ◽  
Sic Particles

The investigation of mechanical properties of silicon carbide (SiC) powders reinforced with aluminum alloy composites are recorded in this paper. SiC powders of approximately 35µm size were added in an aluminum alloy matrix to manufacture the samples of ratios 1, 2, 3 and 4 by weight % using the stir casting technique. The specimens were fabricated and several tests were conducted to evaluate the mechanical properties such as tensile strength, hardness and impact strength and then the values are compared with the base alloy. It has been observed from the results that the hardness, impact energy and tensile strength increases with the increase in % of SiC particles until 2% and drops on further increase in the SiC particles.

scholarly journals Development and Characterization of Al7475/NbC Reniforced Metal Matrix Composites

2020 ◽  
pp. 206-207
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Metal Matrix Composites ◽  
Compression Strength ◽  
Metal Matrix ◽  
High Strength ◽  
Stir Casting ◽  
Matrix Composites ◽  
Alloy Matrix ◽  
Thermal And Electrical Properties

Aluminium metal matrix composites (AMMCs) have considerable applications in aerospace, automotive and military industries due to their high strength to wear ratio, stiffness, light weight, good wear resistance and improved thermal and electrical properties. Ceramic particles such as Al2O3, SiC are the most widely used materials for reinforcement of aluminium. In the present work, an effort is made to enhance the mechanical properties like tensile strength, compression strength and hardness of AMMCs by reinforcing AL7475 matrix with varying NBC particles sizes. By stir casting route (liquid metallurgical technique) in which amount of reinforcement is varied from 2-8 wt% in steps of 2 wt% for varying reinforcement sizes and specimens are artificially aged. The prepared composites of AL7475-Boron Carbide (NBC) are characterized by microstructural studies, SEM and XRD/EDS analysis will be carried out to analyze the microstructure and the dispersion of the reinforced particles in the alloy matrix, mechanical properties such as Tensile strength, Compression Strength, Density, Tribological Properties and Fracture Toughness as per ASTM Standards. Hypothesis of the present work in particularly to the optimum size of reinforcement and also the results of both with and without heat treatment are compared with that of as cast AL7475 Alloy.

Effect of Volume Fraction of Reinforcement on the Microstructure and Mechanical Properties of In Situ (TiB+TiC)/Ti Composite

2011 ◽  
Vol 335-336 ◽  
pp. 137-141 ◽  
Author(s):  
Yuong Chen ◽  
Chang Jiang Zhang ◽  
Fan Tao Kong ◽  
Hong Zhi Niu ◽  
Fang Wu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Tensile Strength ◽  
Elastic Modulus ◽  
Room Temperature ◽  
Volume Fraction ◽  
Microstructural Analysis ◽  
Matrix Composites ◽  
Alloy Matrix

In the present study, Ti-6Al-2.5Sn-4Zr-0.7Mo-0.3Si-0.3Y alloy matrix composites reinforced with TiB and TiC were fabricated by combustion-assisted cast utilizing the reaction between titanium and B4C, graphite. The microstructure, room temperature mechanical properties were presented and discussed. Microstructural analysis of the composites revealed that the prior β grain size as well as the thickness of α colony significantly refined with increasing of volume fraction. At room temperature (RT), tensile strength and elastic modulus increase significantly, while the ductility drops gradually possibly because of the cracking of TiB whiskers and TiC particles.

scholarly journals Structural Properties and Mechanical Behavior of the 2 Step-Reinforced Al-Si/SiCp Metal Matrix Composite by Titanium-Fiber

2017 ◽  
Vol 62 (2) ◽  
pp. 1089-1097
Author(s):  
J.J. Oak ◽  
Y.C. Lee ◽  
Y.H. Park
Keyword(s):  
Tensile Strength ◽  
Metal Matrix ◽  
Room Temperature ◽  
Thermal Shrinkage ◽  
Matrix Composites ◽  
Sintering Process ◽  
Alloy Matrix ◽  
Matrix Metal ◽  
Component Material ◽  
Hot Pressing Sintering

Abstract In this study, the newly designed Al-9Si/SiC particles (SiCp) + Ti-fiber (2step-reinforced Al-9Si alloy matrix) metal matrix composites (MMCs) were fabricated by hot-pressing sintering at 560°C. 2step-reinforced Al-based MMCs were characterized by thermal shrinkage, phase transition, microstructure and tensile strength. The addition of Ti-fiber reduced thermal shrinkage was caused by temperature difference in sintering process as well as enhanced assistance for tensile strength and plastic deformation at room temperature. Experimental results reveal that the 2step-reinforcment sintering by ceramic and metal has a significant effect to increase interface bonding in boundary of each component material and the improved mechanical properties were due to the influence of interfacial product by diffusion. Tensile strength and elongation at room temperature by 2step-reinforcement were improved in 19.5% and 26.2% more than those of Al-9Si/SiCp, respectively. Especially, it reveals that diffusion direction may be varied by sintering methods at low temperature in this study.

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