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 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.

Processing and Microstructure Characteristics of As-Cast A356 Alloys Manufactured via Ultrasonic Cavitation during Solidification

2017 ◽  
Vol 36 (4) ◽  
pp. 381-387 ◽  
Author(s):  
Yang Xuan ◽  
Shian Jia ◽  
Laurentiu Nastac
Keyword(s):  
Mechanical Properties ◽  
A356 Alloy ◽  
Matrix Alloy ◽  
Ultrasonic Cavitation ◽  
Solidification Processing ◽  
Sic Nanoparticles ◽  
Nanoparticle Distribution ◽  
Microstructure Characteristics ◽  
The Matrix ◽  
Cast Microstructure

AbstractRecent studies have showed that the microstructure and mechanical properties of A356 alloy can be significantly improved when ultrasonic cavitation and solidification processing is used. This is because during the fabrication of A356 castings, ultrasonic cavitation processing plays an important role in degassing and refining the as-cast microstructure. In the present study, A356 alloy and Al2O3/SiC nanoparticles are used as the matrix alloy and the reinforcements, respectively. Nanoparticles are injected into the molten alloy and dispersed by ultrasonic cavitation. Ultrasonic cavitation was also applied during solidification of these nanocomposites. The microstructure and nanoparticle distribution of the cast samples have been investigated in detail. The current experimental results indicated that ultrasonic cavitation during solidification will greatly improve the microstructure of the samples. Al2O3 and SiC nanoparticle reinforced nanocomposites have different nanoparticle distributions in the matrix.

Experimental Investigation of Tensile Properties and Fracture Mechanism of WCP/Cu Composites Reinforced with Different WCP Volume Fraction

2011 ◽  
Vol 415-417 ◽  
pp. 2244-2247 ◽  
Author(s):  
Feng Yan ◽  
Rong Xin Guo ◽  
Hai Ting Xia ◽  
Hai Yu ◽  
Yu Bo Zhang
Keyword(s):  
Mechanical Properties ◽  
Fracture Behavior ◽  
Volume Fraction ◽  
Copper Matrix ◽  
Matrix Composites ◽  
Fracture Surface Morphology ◽  
Test Results ◽  
Tension Tests ◽  
Tensile Performance ◽  
The Matrix

The copper matrix composites reinforced by different WCP volume fraction were fabricated via Vacuum Hot-pressed Sintering technique. The tensile performance and fracture behavior of WCP/Cu composites were studied by uniaxial tension tests and the fracture surfaces were examined by SEM. The test results of mechanical properties show that the WCP/Cu composites exhibit obvious improvement of tensile property comparing with that of the matrix. The fracture surface morphology indicate a trend that the fracture of WCP/Cu composites changes from debonding to cleavage with the increase of the WCP volume fraction.

Microstructures and Mechanical Properties of 6061 Al Matrix Smart Composite Containing TiNi Shape Memory Fiber

1996 ◽  
Vol 459 ◽  
Author(s):  
J. H. Lee ◽  
K. Hamada ◽  
K. Miziuuchia ◽  
M. Taya ◽  
K. Inoue
Keyword(s):  
Mechanical Properties ◽  
Shape Memory ◽  
Elevated Temperatures ◽  
Volume Fraction ◽  
Matrix Material ◽  
Matrix Alloy ◽  
Flow Strength ◽  
The Matrix ◽  
Shape Memory Fiber ◽  
Al Matrix

ABSTRACT6061 Al-matrix composite with TiNi shape memory fiber as reinforcement has been fabricated by vacuum hot pressing to investigate the microstructure and mechanical properties. The yield stress of this composite increases with increasing amount of prestrain, and it also depends on the volume fraction of fiber and heat treatment. The smartness of the composite is given due to the shape memory effect of the TiNi fiber which generates compressive residual stresses in the matrix material when heated after being prestrained. Microstructual observations have revealed that interfacial reactions occur between the matrix and fiber, creating two intermetallic layers. The flow strength of the composite at elevated temperatures is significantly higher than that of the matrix alloy without TiNi fiber.

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.

scholarly journals Effect of Fe Content on the Microstructure and Mechanical Properties of Ti-Al-Mo-V-Cr-Fe Alloys

2017 ◽  
Vol 62 (2) ◽  
pp. 1105-1108
Author(s):  
K.C. Bae ◽  
J.J. Oak ◽  
Y.H. Kim ◽  
Y.H. Park
Keyword(s):  
Mechanical Properties ◽  
Volume Fraction ◽  
Alloy System ◽  
Microstructure And Mechanical Properties ◽  
Nucleation Sites ◽  
Fe Content ◽  
Significant Difference ◽  
Before And After ◽  
The Matrix ◽  
Fe Alloys

AbstractTo investigate the effect of Fe content on the correlation between the microstructure and mechanical properties in near-b titanium alloys, the Ti-5Al-5Mo-5V-1Cr-xFe alloy system has been characterized in this study. As the Fe content increased, the number of nucleation sites and the volume fraction of theαphase decreased. We observed a significant difference in the shape and size of theαphase in the matrix before and after Fe addition. In addition, these morphological deformations were accompanied by a change in the shape of theαphase, which became increasingly discontinuous, and changed into globular-typeαphase in the matrix. These phenomena affected the microstructure and mechanical properties of Ti alloys. Specimen #2 exhibited a high ultimate tensile strength (1071 MPa), which decreased with further addition of Fe.

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.

scholarly journals Effects of Yb Addition on the Microstructure and Mechanical Properties of As-Cast ADC12 Alloy

Metals ◽  
2019 ◽  
Vol 9 (1) ◽  
pp. 108 ◽  
Author(s):  
Junjie Xiong ◽  
Hong Yan ◽  
Songgen Zhong ◽  
Minzhu Bi
Keyword(s):  
Mechanical Properties ◽  
Rare Earth ◽  
Cast Alloy ◽  
Eutectic Silicon ◽  
Matrix Alloy ◽  
Optimum Level ◽  
Microstructure Observation ◽  
Microstructure And Mechanical Properties ◽  
The Matrix ◽  
Mechanical Properties Testing

The effects of addition of different amounts of rare earth ytterbium (Yb) on the microstructure and mechanical properties of the casting ADC12 alloy were investigated by mechanical properties testing and microstructure observation. The results indicate that Yb modification had a big influence on the microstructure and properties of the as-cast alloy. The optimum level of Yb content was 0.8 wt %. The coarse dendritic primary α-Al phases were fully refined, leading to the decreasing of the secondary dendrite arm spacing. The morphology of eutectic silicon phases changed from acicular into short rod-like and even granular. There was a structural transformation of β-Fe phases from massive to small rod-shaped morphology. Additionally, the tensile strength, elongation, and microhardness were 267.9 MPa, 4.2%, and 107.3 HV, respectively, increases of 55.4, 121.1, and 41.4%, respectively, compared with the matrix alloy. Fractographic examinations reveal that mainly ductile fracture for Yb addition of 0.8 wt %. The fracture appearances matched the tendency of the tensile properties. Furthermore, the addition of Yb can generate a rare earth phase consisting of the three elements of Al, Si, Yb, with some small iron-rich phases attached around the rare earth phase.

Effect of Ce Addition on Microstructure and Mechanical Properties of ZM21 Magnesium Alloys

2014 ◽  
Vol 788 ◽  
pp. 58-63 ◽  
Author(s):  
Shi Bo Fan ◽  
Jian Peng ◽  
Ming Zhou ◽  
Kai Cui ◽  
Quan Li
Keyword(s):  
Mechanical Properties ◽  
Magnesium Alloy ◽  
Room Temperature ◽  
Matrix Alloy ◽  
Second Phase ◽  
Microstructure And Mechanical Properties ◽  
The Matrix ◽  
Second Phases ◽  
Zm21 Magnesium Alloy ◽  
Ce Content

In this paper, the effects of Ce addition on the microstructure and mechanical properties of the cast and extruded ZM21 magnesium alloy were investigated by OM, XRD, SEM and tensile test at room temperature. It was found that with increase of Ce content, the Mg-Ce and Mg-Zn phases which gather in dendritic gap as second phases increase gradually, and form a network structure finally, which becomes thicker due to serious segregation. Meanwhile, Most of Ce in the extruded ZM21 magnesium alloy is in the forms of second phases, and is broken and dispersed in the matrix alloy during the plastic deformation. With the increase of Ce content, the quantity of the second phase increases, and both the tensile strength and the elongation of ZM21 alloys decrease firstly and then increase. When the content of Ce is 0.57%, the elongation barely reaches the level of ZM21 magnesium alloy. After extrusion, both the tensile and yield strength have been greatly improved.

scholarly journals Mechanical Behaviour of Nickel Aluminide Reinforced Alumina (AL2O3-NiAl) Composites

2002 ◽  
Vol 11 (6) ◽  
pp. 096369350201100 ◽  
Author(s):  
I. J. Davies ◽  
G. Pezzotti ◽  
A. Bellosi ◽  
D. Sciti ◽  
S. Guicciardi
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Grain Size ◽  
Flexural Strength ◽  
Mechanical Behaviour ◽  
Nickel Aluminide ◽  
Volume Fraction ◽  
Matrix Composites ◽  
Microstructure And Mechanical Properties ◽  
The Mean

The microstructure and mechanical properties of hot-pressed alumina (Al2O3) matrix composites containing 20, 35, or 50 vol% of nickel aluminide (NiAl) were investigated. The mean Al2O3 grain size was found to decrease from approximately 2.0 μm (monolithic Al2O3) to 1.0 μm for the composite containing 50 vol% NiAl. Composite flexural strength values were lower than both the monolithic Al2O3 and NiAl and attributed to the weakly bonded NiAl particles acting as flaw origins. In contrast to this, the fracture toughness increased with NiAl volume fraction to a maximum of 4.90 MPa·m1/2, thus confirming the toughening effect of NiAl addition on Al2O3 ceramics, with the slope of the rising R-curve for the composite being approximately 8 times that of monolithic Al2O3.

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