The Experts below are selected from a list of 34206 Experts worldwide ranked by ideXlab platform
Qi-chuan Jiang - One of the best experts on this subject based on the ideXlab platform.
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The nano-sized TiC particle Reinforced Al–Cu matrix composite with superior tensile ductility
Materials Science and Engineering: A, 2015Co-Authors: Dongshuai Zhou, Feng Qiu, Qi-chuan JiangAbstract:Abstract The high mechanicAl properties of the TiC particle Reinforced Al–Cu matrix composites are highly desirable for a wide range of criticAl applications. However, a long-standing problem for these composites is that they suffer from low ductility and limited formability. Here we fabricated the nano-sized TiC particle Reinforced Al–Cu matrix composites by dispersing the nano-sized TiC particles into molten Al–Cu Alloy. The tensile strength and ductility were significantly improved with the addition of the nano-sized TiC particles. The tensile strength and elongation of the 0.5 wt% nano-sized TiC particle reinforce Al–Cu matrix composite can reach to 540 MPa and 19.0%, increased by 11.08% and 187.9% respectively, than those of the Al–Cu matrix Alloy (485 MPa and 6.6%).
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simultaneously increasing the strength and ductility of nano sized tin particle Reinforced Al cu matrix composites
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2014Co-Authors: Dongshuai Zhou, Qi-chuan JiangAbstract:Abstract The microstructures and tensile properties of Ni coated nano-sized TiN particle Reinforced Al–Cu matrix composites via casting were studied. It was found that with the increase of the TiN particle addition, the average size of the α-Al grains decreases. The nano-sized TiN particles enclosed inside the α-Al grains provide some heterogeneous nucleation sites during solidification, resulting in a more refined microstructure. Moreover, the θ ' precipitates in the composites matrix were much finer and more uniformly distributed. After T6 heat treatment, the strength and ductility of the composites increase simultaneously. The yield strength, ultimate strength and elongation of the 2.0 wt% nano-sized TiN p /Al–Cu composite can reach to 365 MPa, 594 MPa and 13.5%, increased by 20.5%, 22.5% and 104.5% respectively from those of the Al–Cu matrix Alloy (303 MPa, 485 MPa and 6.6%).
J Eckert - One of the best experts on this subject based on the ideXlab platform.
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enhancing the interface bonding in carbon nanotubes Reinforced Al matrix composites by the in situ formation of tiAl3 and tic
Journal of Alloys and Compounds, 2018Co-Authors: Xiaoqing Liu, K G Prashanth, Niraj Chawake, Jingmei Tao, Xin You, Yangzhen Liu, J EckertAbstract:Abstract Achieving effective load transfer at the interface between carbon nanotubes (CNTs) and Aluminum (Al) is a cruciAl issue for fabricating high-performance CNTs Reinforced Al matrix (CNT/Al) composites. In this work, CNT/Al composites with different Ti additions and the compared materiAls were prepared by powder metAllurgy. Micro-sized Ti particles in which CNTs are well-dispersed firstly circumvent the difficulty of CNT dispersion, and subsequently act as nucleation site for sandwiched TiAl3 layers that lock the dispersed CNTs in place and improve the CNT-Al interface bonding. AdditionAlly, Ti addition not only Allows modification of the dispersed CNTs but Also enhances the strength of the composites by enhancing the load-bearing capacity of the CNTs through in situ formation of nano-sized titanium carbide (TiC). This work provides a new approach to improve the load transfer efficiency of CNTs by strengthening the interface bonding for fabricating high strength CNT/Al composites.
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Production and mechanicAl properties of metAllic glass-Reinforced Al-based metAl matrix composites
Journal of Materials Science, 2008Co-Authors: S. Scudino, K. B. Surreddi, S. Sager, M. Sakaliyska, W. Löser, J EckertAbstract:Al-based metAl matrix composites were synthesized through powder metAllurgy methods by hot extrusion of elementAl Al powder blended with different amounts of metAllic glass reinforcements. The glass reinforcement was produced by controlled milling of melt-spun Al_85Y_8Ni_5Co_2 glassy ribbons. The composite powders were consolidated into highly dense bulk specimens at temperatures within the supercooled liquid region. The mechanicAl properties of pure Al are improved by the addition of the glass reinforcements. The maximum stress increases from 155 MPa for pure Al to 255 and 295 MPa for the samples with 30 and 50 vol.% of glassy phase, respectively. The composites display appreciable ductility with a strain at maximum stress ranging between 7% and 10%. The mechanicAl properties of the glass-Reinforced composites can be modeled by using the iso-stress Reuss model, which Allows the prediction of the mechanicAl properties of a composite from the volume-weighted averages of the components properties.
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synthesis and mechanicAl properties of cast quasicrystAl Reinforced Al Alloys
Acta Materialia, 2001Co-Authors: F Schurack, J Eckert, L SchultzAbstract:Abstract We report on the preparation and mechanicAl properties of Al-based-composites with quasicrystAlline particles as reinforcement. Al–Mn–Ce/Fe and Al–Mn–Pd bulk samples were synthesized by die casting into a copper mould at moderate cooling rate. Thin ribbons were prepared by melt-spinning as a reference state for the phase formation under most rapid quenching conditions. MicrostructurAl anAlysis was done using X-ray diffraction, scanning and transmission electron microscopy as well as cAlorimetric methods. Significant differences in the phase formation, the composite microstructure and the thermAl stability of the microstructure were found for different Alloy compositions. The deformation behaviour was characterized by constant-rate compression tests at room temperature for a number of Alloy variations yielding excellent properties compared to conventionAlly produced Al-Alloys. The mechanicAl properties vary within a wide range of strength and ductility as a function of the quasicrystAl volume fraction and their morphology. Also first tests at elevated temperatures were carried out, reveAling a promising high temperature stability of the composite.
Nikhilesh Chawla - One of the best experts on this subject based on the ideXlab platform.
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three dimensionAl 3d microstructure based modeling of interfaciAl decohesion in particle Reinforced metAl matrix composites
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2012Co-Authors: J J Williams, J Segurado, J Llorca, Nikhilesh ChawlaAbstract:Modeling and prediction of the overAll elastic–plastic response and locAl damage mechanisms in heterogeneous materiAls, in particular particle Reinforced composites, is a very complex problem. MicrostructurAl complexities such as the inhomogeneous spatiAl distribution of particles, irregular morphology of the particles, and anisotropy in particle orientation after secondary processing, such as extrusion, significantly affect deformation behavior. We have studied the effect of particle/matrix interface debonding in SiC particle Reinforced Al Alloy matrix composites with (a) actuAl microstructure consisting of angular SiC particles and (b) ideAlized ellipsoidAl SiC particles. Tensile deformation in SiC particle Reinforced Al matrix composites was modeled using actuAl microstructures reconstructed from seriAl sectioning approach. InterfaciAl debonding was modeled using user-defined cohesive zone elements. Modeling with the actuAl microstructure (versus ideAlized ellipsoids) has a significant influence on: (a) locAlized stresses and strains in particle and matrix, and (b) far-field strain at which locAlized debonding takes place. The angular particles exhibited higher degree of load transfer and are more sensitive to interfaciAl debonding. Larger decreases in stress are observed in the angular particles, because of the flat surfaces, normAl to the loading axis, which bear load. Furthermore, simplification of particle morphology may lead to erroneous results.
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damage evolution in sic particle Reinforced Al Alloy matrix composites by x ray synchrotron tomography
Acta Materialia, 2010Co-Authors: Jason Williams, Nikhilesh Chawla, Z Flom, Andres Amell, Xianghui Xiao, F De CarloAbstract:MetAl matrix composites (MMCs) have a combination of high strength, high stiffness, and low density. The damage behavior of MMCs has been studied extensively by a combination of traditionAl mechanicAl testing, microstructurAl characterization, and post-experiment fractographic anAlysis. X-ray tomography is an excellent technique that eliminates destructive cross-sectioning, and Allows for superior resolution and image quAlity with minimAl sample preparation. In this work, we have carried out a detailed investigation of the damage behavior of SiC particle Reinforced 2080 Al Alloy matrix composites by X-ray synchrotron tomography. This work is unique, relative to the existing work in the literature, because it: (a) focuses on a technologicAlly relevant MMC system (2080/SiCp), (b) uses a combination of image anAlysis techniques to enable visuAlization and damage characterization, and (c) entails a significant amount of quantitative and statisticAl anAlyses of particle fracture and void growth in the composite. A statisticAlly significant number of particles and volume of the composite were characterized, enabling a meaningful and reAlistic interpretation of the results. Based on this, a detailed understanding of the micromechanisms of fracture and the quantitative influence of particle size and aspect ratio were obtained.
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modeling the effect of particle clustering on the mechanicAl behavior of sic particle Reinforced Al matrix composites
Journal of Materials Science, 2006Co-Authors: Xin Deng, Nikhilesh ChawlaAbstract:The degree of clustering of particles has a significant influence on the mechanicAl behavior of particle Reinforced metAl matrix composites (MMCs). The clustered particles act as crack initiation sites and generAlly have a negative effect on tensile strength, ductility, toughness, and fatigue strength of the composite [1–10]. Murphy et Al. [9] examined the tensile behavior of a 20% SiC particle Reinforced Al–Si composite with different degrees of clustering (by controlling the cooling rate during solidification of the composite). It was shown that an increase in particle clustering yielded a higher work hardening rate, with a significant reduction in ductility. It has been suggested that the matrix flow in the particle cluster is significantly constrained, which results in the premature locAl onset of crack initiation [10–12]. Very few studies have explicitly modeled the effect of particle clustering [10–14]. Segurado et Al. [10] recently investigated the effect of particle clustering on stress–strain behavior using the finite element method (FEM). They found that if particle cracking is not considered in the model, the influence of particle clustering on the predicted stress–strain behavior is not significant. While crack propagation was not explicitly modeled, the fraction of fractured particles as a function of applied strain was estimated by incorporating a Weibull distribution in strength of the particles. It was found that the presence of clustering greatly increased the fraction of fractured particles. In this study, we have conducted a two-dimensionAl FEM simulation to quantify the effect of clustering on locAl and macroscopic stress–strain behavior of Al–SiCp composites. The models explicitly incorporate cracking of the particles for two levels of particle clustering. Two model Al/SiCp microstructures, consisting of circular SiC particles arranged to obtain very different degrees of clustering, were generated using image anAlysis (Image J, Bethesda, MD, USA). A detailed description of the image segmentation process is given elsewhere [15]. The SiC particles were represented as circular particles and the area fraction of particles was kept constant at 30%. SeverAl techniques have been used to quantify clustering of particles in a composite [2, 16, 17]. Yang et Al. [16] have shown that the coefficient-of-variance of the mean nearneighbor distance (COVd) is particularly sensitive and effective in characterizing clustering. This parameter is Also relatively insensitive to particle volume fraction, size, and morphology. COVd can be described by the following equation [16]:
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three dimensionAl 3d microstructure visuAlization and finite element modeling of the mechanicAl behavior of sic particle Reinforced Aluminum composites
Scripta Materialia, 2004Co-Authors: Nikhilesh Chawla, V V Ganesh, B WunschAbstract:Abstract A seriAl sectioning process was used to develop a three-dimensionAl (3D) representation of the microstructure of a SiC particle Reinforced Al composite, for visuAlization and finite-element modeling (FEM). The Young's modulus and stress–strain behavior of the composite predicted by the 3D model of microstructure correlated very well with experimentAl results.
Dongshuai Zhou - One of the best experts on this subject based on the ideXlab platform.
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The nano-sized TiC particle Reinforced Al–Cu matrix composite with superior tensile ductility
Materials Science and Engineering: A, 2015Co-Authors: Dongshuai Zhou, Feng Qiu, Qi-chuan JiangAbstract:Abstract The high mechanicAl properties of the TiC particle Reinforced Al–Cu matrix composites are highly desirable for a wide range of criticAl applications. However, a long-standing problem for these composites is that they suffer from low ductility and limited formability. Here we fabricated the nano-sized TiC particle Reinforced Al–Cu matrix composites by dispersing the nano-sized TiC particles into molten Al–Cu Alloy. The tensile strength and ductility were significantly improved with the addition of the nano-sized TiC particles. The tensile strength and elongation of the 0.5 wt% nano-sized TiC particle reinforce Al–Cu matrix composite can reach to 540 MPa and 19.0%, increased by 11.08% and 187.9% respectively, than those of the Al–Cu matrix Alloy (485 MPa and 6.6%).
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simultaneously increasing the strength and ductility of nano sized tin particle Reinforced Al cu matrix composites
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2014Co-Authors: Dongshuai Zhou, Qi-chuan JiangAbstract:Abstract The microstructures and tensile properties of Ni coated nano-sized TiN particle Reinforced Al–Cu matrix composites via casting were studied. It was found that with the increase of the TiN particle addition, the average size of the α-Al grains decreases. The nano-sized TiN particles enclosed inside the α-Al grains provide some heterogeneous nucleation sites during solidification, resulting in a more refined microstructure. Moreover, the θ ' precipitates in the composites matrix were much finer and more uniformly distributed. After T6 heat treatment, the strength and ductility of the composites increase simultaneously. The yield strength, ultimate strength and elongation of the 2.0 wt% nano-sized TiN p /Al–Cu composite can reach to 365 MPa, 594 MPa and 13.5%, increased by 20.5%, 22.5% and 104.5% respectively from those of the Al–Cu matrix Alloy (303 MPa, 485 MPa and 6.6%).
K G Prashanth - One of the best experts on this subject based on the ideXlab platform.
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microstructure and mechanicAl property of bimodAl size metAllic glass particle Reinforced Al Alloy matrix composites
Journal of Alloys and Compounds, 2020Co-Authors: Meishen Xie, Z. Wang, K G Prashanth, Guoge Zhang, C Yang, W W ZhangAbstract:Abstract A bimodAl size metAllic glassy particles Reinforced 7075 Aluminum composite was fabricated by powder metAllurgy via bAll milling and hot extrusion. The results show that metAllic glassy reinforcements help to improve the densification due to the liquid-like behavior in the supercooled liquid region. The metAllic glassy reinforcements were found to have a bimodAl size distribution at nanoscAle and microscAle, and were uniformly distributed in the matrix. An interphase layer with a thickness of 60–80 nm was observed between the reinforcement/matrix resulted from elementAl diffusion and chemicAl reaction. The introduction of bimodAl size metAllic glassy particles have significantly improved the mechanicAl properties, where the yield strength and fracture strength increase from 442 and 648 MPa for Al7075 to 869 and 962 MPa for composite with 17 vol% reinforcement, respectively. The strengthening mechanisms of the composites were reveAled.
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enhancing the interface bonding in carbon nanotubes Reinforced Al matrix composites by the in situ formation of tiAl3 and tic
Journal of Alloys and Compounds, 2018Co-Authors: Xiaoqing Liu, K G Prashanth, Niraj Chawake, Jingmei Tao, Xin You, Yangzhen Liu, J EckertAbstract:Abstract Achieving effective load transfer at the interface between carbon nanotubes (CNTs) and Aluminum (Al) is a cruciAl issue for fabricating high-performance CNTs Reinforced Al matrix (CNT/Al) composites. In this work, CNT/Al composites with different Ti additions and the compared materiAls were prepared by powder metAllurgy. Micro-sized Ti particles in which CNTs are well-dispersed firstly circumvent the difficulty of CNT dispersion, and subsequently act as nucleation site for sandwiched TiAl3 layers that lock the dispersed CNTs in place and improve the CNT-Al interface bonding. AdditionAlly, Ti addition not only Allows modification of the dispersed CNTs but Also enhances the strength of the composites by enhancing the load-bearing capacity of the CNTs through in situ formation of nano-sized titanium carbide (TiC). This work provides a new approach to improve the load transfer efficiency of CNTs by strengthening the interface bonding for fabricating high strength CNT/Al composites.
