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.

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.

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 Enhanced Mechanical Properties of TiNi Shape Memory Fiber/Al Matrix Composite

1993 ◽  
Vol 34 (3) ◽  
pp. 224-227 ◽  
Author(s):  
Yasubumi Furuya ◽  
Atsushi Sasaki ◽  
Minoru Taya
Keyword(s):  
Mechanical Properties ◽  
Shape Memory ◽  
Matrix Composite ◽  
Shape Memory Fiber ◽  
Al Matrix Composite ◽  
Al Matrix

Mechanical and Morphological Studies of Al6061-Gr-SiC Hybrid Metal Matrix Composites

2015 ◽  
Vol 813-814 ◽  
pp. 195-202 ◽  
Author(s):  
T. Lokesh ◽  
U.S. Mallikarjun
Keyword(s):  
Mechanical Properties ◽  
Metal Matrix Composites ◽  
Metal Matrix ◽  
Hybrid Composites ◽  
Matrix Material ◽  
Matrix Alloy ◽  
Matrix Composites ◽  
Morphological Studies ◽  
The Matrix ◽  
Strength And Ductility

Abstract. In recent years, Aluminium alloy based metal matrix composites (MMC) are gaining wide spread acceptance in several aerospace and automobile applications. These composites possess excellent wear resistance in addition to other superior mechanical properties such as strength, modulus and hardness when compared with conventional alloys. The hybrid composites are new generation of composites containing more than one type, shape or sizes of reinforcements giving superior combined properties of reinforcements and the matrix. In the present work, Al6061 has been used as matrix material and the reinforcing materials selected were SiC and Graphite particulates of 10 to 30µm size. Composites Al6061-Gr (2- 8 wt. %), Al6061-SiC (2 -10wt. %) and Hybrid composites with Al6061 matrix alloy containing 3wt% graphite and varying composition of 2-10wt% SiCp were prepared by stir casting technique. The cast matrix alloy and its composites have been subjected to solutionizing treatment at a temperature of 530 ± 20C for 6 hours, followed by ageing at a temperature of 175 ± 20C for 6 hours. The mechanical properties of as cast and T6 heat treated composites have been evaluated as per ASTM standards and compared. Addition of Graphite particulates into the Al6061 matrix improved the strength and ductility of the composites. Significant improvement in tensile strength and hardness was noticed as the wt. % of SiCp increases in Al6061-SiC composites. Addition of Graphite into Al6061-SiC further improved the strength and ductility of hybrid composites. The heat treatment process had the profound effect in improving the mechanical properties of the studied composites. The microstructural studies revealed the uniform distribution of SiC and Gr particles in the matrix system.

Research on Mechanical Properties of TiNi Shape Memory Alloy Wires Reinforced Al Matrix Composite Material

2015 ◽  
Vol 1120-1121 ◽  
pp. 502-506
Author(s):  
Sheng Nan Yang ◽  
Su Yuan Yang
Keyword(s):  
Mechanical Properties ◽  
Shape Memory Alloy ◽  
Shape Memory ◽  
Volume Fraction ◽  
Split Hopkinson Pressure Bar ◽  
Testing Machine ◽  
Hopkinson Pressure Bar ◽  
Pressing Method ◽  
Pressure Bar ◽  
Al Matrix

TiNi/Al shape memory alloy (SMA) composite was fabricated by a vacuum hot-pressing method to investigate the phase , microstructure and mechanical properties. Phase analysis was conducted by XRD . Interface bonding between TiNi wire and Al matrix was observed by using SEM and EDS. Quasi-static and dynamic compressive mechanical properties of the composite were investigated by using electronic universal testing machine (INSTRON5985) and Split-Hopkinson Pressure Bar (SHPB),respectively. The experiment results show that new phases Ni4Ti3 and Ti2Ni precipitined from TiNi wire. Interfacial reactions occurred at the bonding between matrix and TiNi wire, creating a diffusion layer about 2μm thick. Both quasi-static and dynamic compressive mechanical properties are anisotropic , and the degree of the anisotropy increased with the increase of TiNi volume fraction.

Fabrication and Characterization of TiNi/AL Smart Composites

2003 ◽  
Vol 785 ◽  
Author(s):  
Gyu Chang Lee ◽  
Jun Hee. Lee ◽  
Young Chul Park
Keyword(s):  
Composite Material ◽  
Shape Memory ◽  
Yield Stress ◽  
Room Temperature ◽  
Volume Fraction ◽  
Matrix Material ◽  
Al Alloy ◽  
Alloy Matrix ◽  
Strain Behavior ◽  
The Matrix

ABSTRACTAn attempt was made to fabricate composite material of an Al alloy matrix reinforced by TiNi shape memory fiber using a hot-press method and to investigate its microstructures and mechanical properties. The analysis of SEM and EDS showed that the composite material had good interface bonding. The stress-strain behavior of the composite material was evaluated at room temperature and 363 K as a function of pre-strain, and it showed that the yield stress at 363 K is higher than that at room temperature. It is also found that the yield stress of the composite material increased with increasing the amount of pre-strain and depended on the volume fraction of the fiber and heat treatment. The smartness of the composite could be given due to the shape memory effect of the TiNi fiber, which generated compressive residual stress in the matrix material when heated after being pre-strained. Microstructural observation revealed that interfacial reactions occurred between the matrix and fiber, creating two intermetallic layers.

Microstructure and Mechanical Properties of TiB2/Al Composites

2011 ◽  
Vol 399-401 ◽  
pp. 2266-2270 ◽  
Author(s):  
Shuai Chen ◽  
Yu Tao Zhao ◽  
Hua Jin
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Phase Composition ◽  
Ultimate Tensile Strength ◽  
Master Alloy ◽  
Volume Fraction ◽  
Matrix Material ◽  
The Matrix ◽  
Ti Powder

Abstract:TiB2/Al composites were prepared by the melt in situ reaction fabrication using Al-3B master alloy and Ti powder as the reactive materials. The phase composition and the microstructure of the as-prepared composites were investigated by XRD, SEM. The results indicate that the reinforcements are TiB2 and a small amount of Al3Ti. TiB2particles are in the shape of irregular polygon or rectangle, and its size is 0.5-2μm. Compared with the matrix material, the ultimate tensile strength, microhardness of as-prapred composites increase by 51%, 68.8%, 85.2%, and 33.4%, 43.8%, 55%, respectively. However, the elongation decrease with the volume fraction of the reinforcements increased.

Normal and Abnormal Fracture Behaviors in Low-Cycle Fatigue of a Unidirectionally Reinforced SCS-6/SP-700 Composite

2004 ◽  
Vol 261-263 ◽  
pp. 1091-1096
Author(s):  
Yasuhiro Yamazaki ◽  
A. Ikada ◽  
M. Okazaki
Keyword(s):  
Titanium Alloy ◽  
Room Temperature ◽  
Failure Modes ◽  
Elevated Temperatures ◽  
Volume Fraction ◽  
Low Cycle Fatigue ◽  
Matrix Alloy ◽  
Loading Frequency ◽  
Cycle Fatigue ◽  
The Matrix

Titanium alloy matrix composites (TMCs) have received considerable interest as structural materials for aeronautical applications, because of their higher specific strength and stiffness. When applying TMCs at elevated temperatures, high temperature isothermal low-cycle fatigue (LCF)failure is one of critical issues to be concerned. A unidirectionally reinforced SCS-6/ SP-700 composite is a tentative target in this work, where the matrix alloy, SP-700 is a new generation high strength Titanium alloy developed by NKK Inc., and the SCS-6 is a beta-SiC fiber developed by Textron Specially Materials, respectively. A merit to employ the SP-700 is that this alloy enables to reduce a fabrication temperature, because of its capability for superplasticity at relatively lower temperatures. The 7-plies composite specimen was produced by hot isostatic pressing (HIP) at 800°C for 0.5 hrs. in vacuum, alternating layers of thin-foils of the SP-700 and the green tapes of the SCS-6 fibers, so that the fibers were uniformly distributed as a hexagonal array in the matrix. The volume fraction of the fibers in the composite is about 28 %. In this work, the following articles in a unidirectionally reinforced SCS-6/SP-700 composite have been studied and evaluated: (i)mechanical properties of the SCS-6/SP-700 composite and the matrix alloy at temperatures ranged between room temperature and 450°C; (ii) LCF lives and the failure modes of the composite and the matrix alloy at room temperature and 450°C; (iii) fiber push-out tests at elevated temperatures ranged between room temperature and 600°C, to represent the fiber/matrix interfacial strength; and (iv) observation and the characterization of the interfacial reaction zone by means of a transmission electron microscope (TEM) and an energy dispersive X-ray spectrometer (EDS). Based on these experimental results, the effects of temperature and the loading frequency on LCF failure of the SCS-6/SP-700 composite were discussed.

Constitutive Modeling of Near-Equiatomic NiTi Shape Memory Alloys Considering Composition and Heat Treatment

2016 ◽  
Vol 856 ◽  
pp. 78-84
Author(s):  
Austin Cox ◽  
Theocharis Baxevanis ◽  
Dimitris C. Lagoudas
Keyword(s):  
Heat Treatment ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Volume Fraction ◽  
Lattice Mismatch ◽  
Memory Performance ◽  
Matrix Material ◽  
Precipitate Growth ◽  
The Matrix ◽  
Niti Shape Memory Alloys

A predictive microscale-informed model that takes into account the precipitate–shape memory performance relations and allows for the evaluation of the effective thermomechanical response of precipitated Ni-rich NiTi shape memory alloys on the basis of composition and heat treatment is presented. The model considers the structural effect of the precipitates (coherency stresses due to the lattice mismatch between the precipitates and the matrix material and precipitate volume fraction), as well as the effect of the Ni-concentration gradient in the matrix, resulting from Ni-depletion during precipitate growth. The predictive capability of the model is tested against experimental data obtained fromNi50.7Ti (at. %) that has been heat treated under different conditions and good agreement is shown.

Microstructure and Mechanical Properties of Al2O3-TiC/Al in Situ Composites

2006 ◽  
Vol 326-328 ◽  
pp. 1857-1860
Author(s):  
Hong Mei Chen ◽  
Hua Shun Yu ◽  
Jing Zhang ◽  
Lin Zhang ◽  
Guang Hui Min
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Room Temperature ◽  
Volume Fraction ◽  
Matrix Alloy ◽  
Co2 Gas ◽  
In Situ Composites ◽  
In Situ Reaction ◽  
The Matrix

The Al2O3-TiC/Al composites were prepared by injecting CO2 gas into Ti contained Al-Si alloy melts. The microstructure of the composites was examined by XRD, SEM and TEM. It was indicated that both Al2O3 and TiC particles can be formed by the in situ reaction of CO2 with Ti and Al in the melten alloys. The Al2O3 and TiC particles in size of 0.3~1.5μm distributed uniformly in the matrix. The volume fraction of the particles is mainly depend upon the time of CO2 injection.The tensile strength at room temperature of the composites can reach 346.08MPa and the hardness is 149.6MPa HBS, repectively, which are higher than those of the matrix alloy.

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