The chemical compatibility and tensile behavior of an Ni3Al-based composite

1990 ◽  
Vol 5 (8) ◽  
pp. 1649-1655 ◽  
Author(s):  
G. E. Fuchs
Keyword(s):  
Heat Treatment ◽  
Tensile Properties ◽  
Nickel Aluminide ◽  
Load Transfer ◽  
Matrix Alloy ◽  
Tensile Failure ◽  
Chemical Compatibility ◽  
Intermetallic Matrix ◽  
The Matrix ◽  
Particulate Matrix

The chemical compatibility and tensile properties of a powder processed intermetallic matrix composite (IMC) were investigated in the temperature range 298–1373 K. The matrix alloy selected for this study was the ORNL developed advanced nickel-aluminide IC-221 (Ni-16Al-8Cr-1Zr-0.05B at. %). The composite contained 25 vol. % TiC particulate reinforcement. TiC/IC-221 compatibility samples were heat treated at 1373 K for up to 1000 h. A layer enriched in Zr and Ti formed at the TiC/IC-221 interface after heat treatment. In addition, Ti was observed to diffuse into the matrix. The composite exhibited higher yield strength and lower ductility than a similarly processed matrix alloy at all test temperatures. Heat treatment of the composite improved the tensile properties due to particulate/matrix interaction, resulting in improved load transfer. SEM fractography revealed that tensile failure occurred at the matrix/prticulate interface. Remnants of the matrix were observed on TiC particles on the fracture surface, suggesting good matrix/particulate bonding. The mechanical properties of the composite were very competitive with Ni-base superalloys.

The Tensile Behavior of a Ni3Al-Based Composite with TiC Reinforcement

1988 ◽  
Vol 133 ◽  
Author(s):  
Gerhard E. Fuchs
Keyword(s):  
Fracture Surface ◽  
Nickel Aluminide ◽  
Matrix Alloy ◽  
Tensile Behavior ◽  
Tensile Failure ◽  
Particulate Reinforcement ◽  
Intermetallic Matrix ◽  
Particle Bonding ◽  
Intermetallic Matrix Composite ◽  
The Matrix

ABSTRACTThe tensile properties of a powder processed intermetallic matrix composite (IMC) and a similarly processed matrix alloy were investigated in the temperature range 298–1273K. The matrix alloy utilized in the study was the advanced nickel-aluminide IC-221 (Ni-16Al-8Cr-1Zr-0.05B). The composites contained 25 vol% TiC particulate reinforcement. The specific modulus of the composites was 20–30% higher than that of typical Ni-base superalloys. The yield strength of the composites were 10–20% greater than that of the matrix at all test temperatures. However, the composites exhibited lower ductility than the matrix. SEM fractography revealed that tensile failure occurred at the matrix/particulate interface. However, remnants of the matrix was observed on TiC particles on the fracture surface, suggesting good matrix/particle bonding. The strengths of the composites were very competitive with Ni-base superalloys.

Microstructure and Mechanical Properties of Ni3Al-Based Alloy/Tic Composites

1994 ◽  
Vol 364 ◽  
Author(s):  
W. M. Yin ◽  
J. T. Guo ◽  
S. H. Wang ◽  
H. Li ◽  
M. H. Tan ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Nickel Aluminide ◽  
Volume Fraction ◽  
Matrix Alloy ◽  
Tensile Failure ◽  
Test Results ◽  
Solidification Processing ◽  
Particulate Reinforcement ◽  
Microstructure And Mechanical Properties ◽  
The Matrix

AbstractThe microstructure and mechanical properties of Ni3Al-based composites reinforced with TiC particles have been investigated. The composites, which contained 2, 6, 10 vol.%TiC particulate reinforcement, were fabricated by solidification processing method. The matrix alloy selected for this study was the advanced nickel-aluminide (Ni-16Al-8Cr-1Zr-0.8Mo-0.04B at.%).The optical micrographs revealed that the carbides in the composites distributed uniformly in the martix and appeared as fairly equiaxed particles. SEM observation showed that the interface between TiC and matrix is quite smooth, sharp and free of any phase. The test results indicated that the hardness was increased with increasing volume fraction of TiC particles at ambient temperature, and the composites exhibited higher hardness after 1100°C × 8h heat treatment. The yield strength has been improved due to reinforcement by the TiC particles at ambient and elevated temperature, but their ductility was reduced obviously. From SEM fractography, it could be seen that tensile failure occurred at the matrix / particulate interface.

The Study of Microstructures and Tensile Properties of an In Situ A356-ZrB2 Metal Matrix Composite

2013 ◽  
Vol 553 ◽  
pp. 29-33 ◽  
Author(s):  
H. Moosavian ◽  
Masoud Emamy ◽  
M. Mansouri Arani ◽  
S. Mahboubi
Keyword(s):  
Heat Treatment ◽  
Tensile Properties ◽  
Weight Ratio ◽  
Matrix Alloy ◽  
Xrd Analysis ◽  
Al Alloy ◽  
T6 Heat Treatment ◽  
Master Alloys ◽  
Before And After ◽  
The Matrix

A composite containing A356 Al alloy as matrix and ZrB2 particles was made in an induction furnace by mixing Al-15Zr and Al-8B master alloys with Zr:B weight ratio of 9:2. The microstructures and tensile properties of the extruded composite were studied by scanning electron microscopy (SEM) and x-ray diffraction (XRD) analysis before and after T6 heat treatment. XRD results showed the presence of ZrB2 phase in the microstructure. Tensile test results showed an increase in ultimate tensile strength (UTS) and elongation values of the extruded composite in comparison with the matrix alloy. Further investigation showed an increase in UTS, but reduction in elongation values of the composite after T6 heat treatment.

Processing, Microstructure and Mechanical Properties of SiCp/AZ91 Mg Matrix Composites Fabricated by Squeeze Casting

2007 ◽  
Vol 546-549 ◽  
pp. 499-502
Author(s):  
X. Qiu ◽  
Xiao Jun Wang ◽  
Ming Yi Zheng ◽  
Kun Wu
Keyword(s):  
Mechanical Properties ◽  
Tensile Properties ◽  
Squeeze Casting ◽  
Volume Fraction ◽  
Matrix Alloy ◽  
Matrix Composites ◽  
Magnesium Matrix Composites ◽  
The Matrix ◽  
Az91 Magnesium ◽  
Different Diameters

The fabrication processing, mechanical properties and fracture characters of SiCp/AZ91 magnesium matrix composites fabricated by squeeze casting were investigated. The SiC particles with different diameters (5μm, 20μm and 50μm) were employed as the reinforcement in the composites, the volume fraction of them was 50% in all cases. Experimental results showed that when the size of SiC particle decreased, the tensile properties of the composite increased. The tensile properties of SiCp/AZ91 composite with small particles are controlled by the properties of matrix alloy and the strength of the interface between the matrix and reinforcements, but the composites reinforced by large particles are controlled by the fracture of the particles.

Effect of Extrusion Parameters on Mechanical Properties of Al6061-Ni-P Coated SiC Composites

2013 ◽  
Author(s):  
Ramesh Chinnakurli Suryanarayana ◽  
Sikhakolli Ramakrishna ◽  
Ummar Khan Attaullah ◽  
Smitha Hanumantha Badnur ◽  
Kumar Saheb
Keyword(s):  
Mechanical Properties ◽  
Load Transfer ◽  
Hot Extrusion ◽  
Matrix Alloy ◽  
Extrusion Process ◽  
Systematic Investigation ◽  
Strength Properties ◽  
Industrial Applications ◽  
The Matrix ◽  
Sic Composites

Extrusion of metal matrix composites (MMCs) is a very challenging one where in the bond between the reinforcement and the matrix alloy is crucial in getting high quality extrusions for industrial applications. In recent years researchers are focusing on developing aluminium based composites with metallic coated reinforcement to achieve good interfacial bonds to ensure smooth load transfer from the matrix on to reinforcement. However no information is available as regards hot extrusion of metallic coated reinforced MMCs. In the light of the above, the present work focuses on a systematic investigation on effect of extrusion process parameters on mechanical properties of Al6061-Ni-P coated SiC composites. From the investigation, it is observed that hardness, yield and ultimate strength of Al2014-SiC (Both uncoated and Ni-P coated) composites are higher when compared with the matrix alloy for all the extrusion ratios studied (4:1,5:1,10:1,15.5:1) at a given extrusion temperature. However, the ductility of composites decreases with increase in extrusion ratios. Further, heat treatment has a significant effect on the studied mechanical properties. Increase in extrusion temperatures at a given extrusion ratio has resulted in decrease in hardness and strength properties of both matrix alloy and developed composites.

Effect of Addition of Al & Ca and Heat Treatment on the Cast Mg-6Zn Alloy

2013 ◽  
Vol 765 ◽  
pp. 33-37 ◽  
Author(s):  
S.S. Joshi ◽  
M.S. Mohan ◽  
S. Seshan ◽  
S. Kumar ◽  
S. Suwas
Keyword(s):  
Heat Treatment ◽  
Grain Size ◽  
Grain Boundary ◽  
Tensile Properties ◽  
Volume Fraction ◽  
Corrosion Behaviour ◽  
Boundary Phase ◽  
Al Content ◽  
Β Phase ◽  
The Matrix

In the present investigation, the effect of addition of Al and small amounts of Ca as well as the effect of heat treatment has been investigated on microstructure, tensile properties and corrosion behaviour of Mg-6Zn alloy produced by squeeze casting. The Mg-6Zn-1Al (ZA61) alloy consisted of α-Mg grains and MgZn (β) phase at the grain boundaries with a much higher strength and ductility than pure Mg. The addition of 0.1 and 0.5 wt% Ca to the ZA61 alloy refined the grain size and increased the volume fraction of the grain boundary phase but did not change the nature of the phase. Consequently, strength increased without much reduction in ductility. The increase in Al content of the alloy to 4 wt% (ZA64) changed the grain boundary phase to Al5Mg11Zn4 (Φ) phase, increased its volume fraction and refined the grain size as compared to ZA61 alloy. Consequently, strength increased with a reduction in ductility. On heat treatment of ZA61+0.5Ca and ZA64 alloys, the volume fraction of grain boundary phases decreased, fine precipitates were obtained in the matrix and the grain size increased. Thus, higher strength with a lower ductility was obtained on heat treatment but the ductility of both the alloys was still higher than that of pure Mg. Thus, 130 MPa 0.2%PS, 225 MPa UTS and 4.9% elongation to fracture could be obtained for the squeeze cast ZA64 alloy in the T6 condition, which are very good tensile properties for a cast Mg alloy. Increase in Al content and heat treatment reduced the corrosion resistance and addition of Ca improved it. The highest corrosion rate was observed to be 0.85 mm/year for the ZA64 alloy in the T6 condition.

Tensile Creep Damage and Rupture of Al2O3-SiO2(sf)/AZ91 Composite

2011 ◽  
Vol 55-57 ◽  
pp. 257-261
Author(s):  
Jun Tian ◽  
Shou Yan Zhong
Keyword(s):  
Creep Resistance ◽  
Load Transfer ◽  
Fiber Composite ◽  
Fiber Quality ◽  
Matrix Alloy ◽  
Short Fiber ◽  
Grain Boundary Sliding ◽  
Tensile Creep ◽  
Aluminum Silicate ◽  
The Matrix

Constant stress tensile creep tests were conducted on an AZ 91–25 vol.% Al2O3-SiO2short fiber composite and on an unreinforced AZ 91 matrix alloy. The creep resistance of the reinforced material is shown to be considerably improved compared with the matrix alloy. The creep strengthening arises mainly from the effective load transfer between plastic flow in the matrix and the fibers. Microstructural investigations by SEM revealed good fiber–matrix interface bonding during creep exposure. Short fibers have a great function in load bearing and load transfer, and greatly hinder the dislocation movement, thus enhancing the creep resistance of the composite. Damage and multiple rupture of aluminum silicate short fiber, quality of the interface combination between aluminum silicate short fiber reinforcement and the matrix, are two important factors of the creep deformation microstructure process control of Al2O3-SiO2(sf)/AZ91 composite. The creep mechanism of the composite is dislocation and grain boundary sliding control.

Abrasive Wear Behaviour of Al-Si-Graphite Composite Under Heat-Treated Condition

2007 ◽  
Author(s):  
C. S. Ramesh ◽  
T. B. Prasad
Keyword(s):  
Heat Treatment ◽  
Abrasive Wear ◽  
Matrix Alloy ◽  
Stir Casting ◽  
Sem Analysis ◽  
Wear Behaviour ◽  
Test Duration ◽  
Graphite Composite ◽  
Before And After ◽  
The Matrix

Composites were prepared from commercially available scrap piston by dispersing copper coated graphite particulates by stir casting, followed by heat treatment of the composite. Abrasive wear tests were conducted on the composites and the matrix alloy both before and after heat treatment. The test duration was 30min while coarse silicon carbide abrasive wheels were used. Wear was measured as weight loss of the specimen using digital weighing machine of accuracy 0.001gms. The worn surfaces were subjected to SEM analysis. Addition of graphite particulates followed by heat treatment has resulted in uniform distribution of graphite in the matrix alloy and improved abrasive wear resistance of the cast Al-Si-graphite composites.

Strengthening of Al-4.5%Cu alloy with the addition of Silicon Carbide and Bamboo Leaf Ash

2019 ◽  
Vol 10 (2) ◽  
pp. 149-161 ◽  
Author(s):  
Praveen Kumar Bannaravuri ◽  
Anil Kumar Birru
Keyword(s):  
Hybrid Composites ◽  
Research Work ◽  
Cost Effective ◽  
Matrix Alloy ◽  
Stir Casting ◽  
Sem Analysis ◽  
Tensile Failure ◽  
Content Type ◽  
Cu Alloy ◽  
The Matrix

Purpose The purpose of this paper is to determine the use of BLA along with SiC as economical reinforcements to enhance the mechanical behavior of hybrid composite. The purpose of this research is the development of cost-effective aluminum hybrid metal matrix composites. Design/methodology/approach The present research work investigation evaluated the mechanical properties of Al-4.5%Cu alloy, Al-4.5Cu/10SiC, Al-4.5Cu/10SiC/2BLA and Al-4.5Cu/10SiC/4BLA composites by the Stir casting method. The fabricated composites were analyzed using optical microscopy (OM), scanning electron microscopy (SEM), and hardness and tensile test. Findings The microstructure modification with the addition of reinforcement particles in the matrix alloy and clear interface in between matrix and particles are observed. The density of the composite increased with the addition of SiC and decreased with the addition of BLA in comparison with that of matrix alloy. The hardness and tensile strength of the single-reinforced composite and hybrid composites improved with the addition of reinforcement particles. The strengthening of composites was due to load-bearing capacity of reinforcement particles over the matrix alloy and increased dislocation density of composites materials. The tensile failure mechanism of the composites is reveled with SEM analysis. Practical implications The papers reports the development of cost-effective and light weight aluminum hybrid composites with remarkable enhancement in the mechanical and tribological properties with the addition of BLA as economical reinforcement along with SiC. Originality/value The density, hardness and tensile values of fabricated aluminium composites were presented in this paper for the use in the engineering applications where the weight and cost are consider as a primary factors.

Tensile Properties of 15wt. %TiB2/7055 Composite Fabricated by In Situ Method

2013 ◽  
Vol 842 ◽  
pp. 165-169 ◽  
Author(s):  
Dong Chen ◽  
Cong Zou ◽  
Yi Jie Zhang ◽  
Nai Heng Ma ◽  
Hao Wei Wang
Keyword(s):  
Tensile Strength ◽  
Aluminum Alloy ◽  
Elastic Modulus ◽  
Ultimate Tensile Strength ◽  
Tensile Properties ◽  
Matrix Alloy ◽  
In Situ Method ◽  
The Matrix ◽  
7055 Aluminum Alloy

7055 aluminum alloy reinforced with 15wt. % TiB2 particulates was synthesized by in situ method, the microstructure and tensile properties were investigated. There are a few particulate clusters in the matrix. The elastic modulus and hardness of the composite are higher than that of the matrix alloy, but the yield strength and ultimate tensile strength decrease. The decrease of strength is attributed to the presence of TiB2 particulate cluster and residual reaction slag.

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