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1.
Effects of the matrix properties,particle size distribution and interfacial matrix failure on the elastoplastic deformationbehavior in Al matrix composites reinforced by SiC particles with an average size of 5μm and volume fraction of 12%werequantitatively calculated by using the expanded effective assumption(EMA)model.The particle size distribution naturally bringsabout the variation of matrix properties and the interfacial matrix failure due to the presence of SiC particles.The theoretical resultscoincide well with those of the experiment.The current research indicates that the load transfer between matrix and reinforcements,grain refinement in matrix,and enhanced dislocation density originated from the thermal mismatch between SiC particles and Almatrix increase the flow stress of the composites,but the interfacial matrix failure is opposite.It also proves that the load transfer,grain refinement and dislocation strengthening are the main strengthening mechanisms,and the interfacial matrix failure and ductilefracture of matrix are the dominating fracture modes in the composites.The mechanical properties of the composites strongly dependon the metal matrix. 相似文献
2.
废弃玻璃/铝基复合材料的组织和性能 总被引:13,自引:0,他引:13
利用搅拌熔铸法将废弃玻璃颗粒加入到熔融的基体合金ZL105中,制备出了废弃玻璃/铝基复合材料,研究了复合材料的微观组织,力学性能及断裂机理,结果表明,玻璃颗粒较均匀地分布于基体中,与基体发生界面反应;与基体合金相比,废弃玻璃颗粒的加入提高了复合材料的硬度和抗拉强度,在低载荷下,复合材料的摩擦性能优于基体合金,由于玻璃颗粒形状较尖锐,尺寸大小不均,并存在加工缺陷,有碍于大幅度提高复合材料的性能。 相似文献
3.
C.S. Ramesh R. KeshavamurthyS. Pramod Praveennath G. Koppad 《Journal of Materials Processing Technology》2011,211(8):1423-1431
Ni-P coated Si3N4 reinforced Al6061 composites were fabricated by vortex method. Percentage of reinforcement was varied from 6 wt.% to 10 wt.% in steps of 2. Cast matrix alloy and developed composites were hot forged at a temperature of 500 °C using a 300T hydraulic hammer. Both as cast and hot forged matrix alloy and its composites were subjected to microstructure studies, grain size analysis, microhardness and abrasive wear tests. Microstructure studies reveal uniform distribution of silicon nitride particles with good bond between matrix and reinforcement in both as cast and hot forged condition. It is observed that, increased content of reinforcement in both as cast and hot forged composites do result in significant grain refinement. However, when compared with as cast matrix alloy and its composites hot forged alloy and its composites exhibits higher extent of grain refinement. Both as cast and hot forged composites exhibit improved microhardness and abrasive wear resistance when compared with the unreinforced alloys under identical test conditions. Abraded worn surfaces were examined using scanning electron microscopy (SEM) for possible wear mechanisms. Increased abrasive particle size and load has resulted in larger extent of grooving leading to increased abrasive wear loss for both the matrix alloy and developed composites. 相似文献
4.
AZ91D alloy composites with 1.0% CNTs have been fabricated by a method combined ball milling with stirring casting. The composite was investigated using optical microscopy(OM), X-ray diffraction(XRD), Fourier transform infrared spectroscope (FT-IR), scanning electron microscope (SEM), transmission electron microscope (TEM) and room temperature (RT) tensile test. The results show that CNTs were homogeneously distributed in the matrix and maintained integrated structure. The yield strength and ductility of AZ91D/CNTs composite were improved by 47.2% and 112.2%, respectively, when compared with the AZ91 alloy. The uniform distribution of CNTs and the strong interfacial bonds between CNT and the matrix are dominated to the simultaneous improvement of yield strength and ductility of the composite. In addition, the grain refinement as well as the finer β phase (Mg17Al12) with homogenous distribution in the matrix can also slightly assist to the enhancement of the mechanical properties of the composite. 相似文献
5.
6.
原位TiB2颗粒增强铝基复合材料及其力学性能 总被引:1,自引:1,他引:1
对原位反应合成TiB2/A356铝基复合材料微观组织和力学拉伸性能进行了研究。结果表明,原位反应生成的颗粒增强相在复合材料基体中分布均匀,基体与颗粒间的界面洁净。复合材料强度随着颗粒含量的增加显著提高,与基体合金相比,TiB2质量分数为8%的TiB2/A356复合材料强度和弹性模量的提高幅度约为28%,TiB2质量分数为16%的TiB2/A356复合材料强度和弹性模量的提高幅度约为35%。复合材料的断裂主要是由于基体与颗粒界面脱粘,在拉伸应力作用下由此萌生微裂纹并扩展,导致界面处的基体撕裂,从而降低复合材料塑性。 相似文献
7.
Preparation, microstructures and deformation behavior of SiCP/6066Al composites produced by PM route
Preparation, microstructures and deformation behavior of 12 vol.% SiCP/6066Al composites fabricated by a powder metallurgy (PM) route have been systemically reported in this paper. The experimental results indicated that SiC particles were distributed homogeneously in the aluminum matrix, and that the constituents of the matrix were Al, needle-shaped β′-Mg2Si phases and a small amount of dispersoids (Fe, Mn, Cu)3Si2Al15 (BCC structure with lattice parameter a ≈ 12.8 Å). A well-bonded SiC/Al interface consisting of a thin and clean layer of polycrystalline structure of metal matrix with segregation of Mg element has been observed. The SiC particle cracking and the ductile-tearing of SiC/Al interfaces caused the rupture of the composites. The experimental data coincided well with the theoretical results predicted by an extended effective model assumption (EMA). The current study indicates that load transfer between the matrix and reinforcements, grain refinement of metal matrix, and dislocation strengthening are the main strengthening mechanisms of SiCP/Al composites. The ductile-tearing of SiCP/Al interfaces and the SiC particle cracking are the dominating failure modes and the deformation behavior of SiCP/Al composites strongly depends on the properties of matrix alloy. 相似文献
8.
I. Ozdemir S. MuecklichH. Podlesak B. Wielage 《Journal of Materials Processing Technology》2011,211(7):1260-1267
A comparative evaluation has been carried out on the microstructure of aluminum based SiC and Al2O3 particle reinforced composites produced by semi-solid direct squeeze forming of composite powder at temperatures of 635-645 °C. The study is focused on the distribution of the reinforcement and the intermetallic phases, the porosity content, the microstructure of the matrix phase, the interfacial state and mechanical properties. The particle size of the reinforcements, the time of the high-energy ball milling procedure for the fabrication of composite powder and the semi-solid forming temperature had a strong influence on the quality of sample in terms of distribution of reinforcement and interfacial interaction. Ball milling improves the interface formation between reinforcement and matrix and influences the remelting behaviour. Increasing ball milling time and decreasing semi-solid forming temperature with isothermal holding time resulted in relatively homogenous microstructures and in a reduced amount of interaction between SiC and metal matrix. Best results were obtained for 5 vol.% SiCp composites after 3 h ball milling, semi-solid formed at 635 °C and held for 10 min. 相似文献
9.
S. C. Sharma 《Journal of Materials Engineering and Performance》2003,12(3):324-330
This paper presents a novel equation for the density of ceramic particle reinforced metal matrix composites. An overall density
change occurs in composites due to the thermal mismatch between the metal matrix and the reinforcement. The thermal mismatch
occurs because the coefficient of thermal expansion and the elastic properties are different for the matrix and the reinforcement.
The values obtained using the proposed equation for density were compared with both the rule of mixtures for density and the
experimental values obtained for aluminium and zinc alloy composites. The composite specimens were fabricated using compocasting
technique (one of the types of liquid metallurgy route). The proposed mathematical model is found have better agreement with
the experimental results at lower volume fractions of the reinforcement; however, some deviations were observed at higher
volume fractions of the reinforcement. The proposed equation yields agreeable results for aluminium composites and fairly
agreeable results for zinc alloy composites. 相似文献
10.
采用真空压力浸透法制备SiCp/AZ91复合材料,研究其显微组织、力学性能和耐磨性。结果表明,SiC颗粒均匀分布于金属基体中,并与基体界面结合良好。Mg17Al12相在SiC颗粒附近优先析出,SiC与AZ91基体的热膨胀系数失配导致高密度位错的产生,加速基体的时效析出。与AZ91合金相比,SiC颗粒的加入提高了复合材料的硬度和抗压强度,这主要是由于载荷传递强化和晶粒细化强化机制。此外,由于SiC具有优异的耐磨性,在磨损过程中形成稳定的支撑面保护基体。 相似文献
11.
SiCp-reinforced commercial pure magnesium and AZ91 alloy MMCs’ were prepared through infiltration route without the use of any
special atmospheres. The preform was prepared using a mixture of reinforcement particles and the matrix metal particles. The
composites were prepared with various volume percentage of the reinforcement and their properties with the variation of SiCp were analyzed. The interfacial properties of the composites were analyzed using microstructure, microhardness, and wear studies.
Calculation of thermal conditions during infiltration was done to study the effect of adding matrix metal particles on the
infiltration behavior and its effect on the uniformity distribution of the reinforcements. 相似文献
12.
Ming-Jie Shen Tao Ying Fu-Yu Chen Jun-Ming Hou 《Journal of Materials Engineering and Performance》2016,25(6):2222-2229
The effects of the volume ratios of micro and nano-SiC particles (SiCp) on the grain refinement, distribution of SiCp particle, and tensile properties of the as-cast AZ31B (Mg-3Al-1Zn-0.3Mn) magnesium-based metal matrix composites have been investigated. As the volume fraction of micron SiCp decreases to 9 vol.% and the nano-SiCp increases to 1 vol.%, excellent grain refinement effect is achieved. This is due to both the uniform distribution and refining effects of micro- and nano-SiCp. Moreover, the micron SiCp distribute along the grain boundaries, while nano-SiCp is mainly distributed around the micron SiCp. The room-temperature tensile results show that the optimal room-temperature yield and tensile strengths are achieved with a 9/1 ratio of micro to nano-SiCp, while the 9.5/0.5 ratio yielded the highest elongation. 相似文献
13.
《中国有色金属学会会刊》2021,31(12):3613-3625
Dry sliding wear behaviour of stir-cast aluminium matrix composites (AMCs) containing LM13 alloy as matrix and ceramic particles as reinforcement was investigated. Two different ceramic particle reinforcements were used separately: synthetic ceramic particles (B4C), and natural ceramic particles (ilmenite). Optical micrographs showed uniform dispersion of reinforced particles in the matrix material. Reinforced particles refined the grain size of eutectic silicon and changed its morphology to globular type. B4C reinforced composites (BRCs) showed maximum improvement in hardness of AMCs. Ilmenite reinforced composites (IRCs) showed maximum reduction in coefficient of friction values due to strong matrix−reinforcement interfacial bonding caused by the formation of interfacial compounds. Dry sliding wear behaviour of composites was significantly improved as compared to base alloy. The low density and high hardness of B4C particles resulted in high dislocation density around filler particles in BRCs. On the other hand, the low thermal conductivity of ilmenite particles resulted in early oxidation and formation of a tribo-layer on surface of IRCs. So, both types of reinforcements led to the improvement in wear properties of AMCs, though the mechanisms involved were very different. Thus, the low-cost ilmenite particles can be used as alternative fillers to the high-cost B4C particles for processing of wear resistant composites. 相似文献
14.
15.
以硼质量分数为0.5%的Cu–B合金为金属基体以及平均粒径为500 μm的金刚石颗粒为增强体,采用气压熔渗法制备金刚石/Cu–B合金复合材料,研究气压参数对其组织结构和热物理性能的影响规律。结果表明:随着气压升高,金刚石与Cu–B合金之间的界面结合效果、导热性能均增强,热膨胀系数减小;当气压为10 MPa时,其界面结合效果最优,界面处生成的碳化物层将金刚石完全覆盖,且100 ℃时的样品热导率为680.3 W/(m·K),热膨胀系数为5.038×10?6 K?1,满足电子封装材料的热膨胀系数要求。 相似文献
16.
采用机械球磨与热压烧结相结合的粉末冶金法对不同球磨时间Nb-35Ti-6Al-5Cr-8V-5C合金的粉末变形行为,微观组织结构和力学行为进行研究。结果表明:随着球磨时间的增加,Nb-35Ti-6Al-5Cr-8V-5C复合粉末中的块状金属颗粒首先变形为片状后在碰撞挤压作用下破碎成絮状,TiC粉末均匀的分布于片状金属粉末表面;Nb-35Ti-6Al-5Cr-8V-5C合金由Nbss和(Nb,Ti)C两相构成,各合金碳化物体积分数均为11%左右,Ti元素主要分布于Nbss晶界和碳化物内,Al、Cr、V元素主要分布于Nbss晶粒内,Nbss和(Nb,Ti)C相尺寸均随球磨时间增加而尺寸减小;Nbss晶粒细化及强化相碳化物弥散化导致合金的室温压缩力学性能和塑性变形能力显著提高,压缩变形后合金Nbss与碳化物具有良好的界面结合能力,但是碳化物内部存在明显的近似平行分布的裂纹;数据对比表明,粉末冶金法制备Nb-35Ti-6Al-5Cr-8V-5C合金的力学性能优于电弧熔炼法。 相似文献
17.
K. A. Khor Y. Cao F. Y. C. Boey K. Hanada Y. Murakoshi T. S. Sudarshan T. S. Srivatsan 《Journal of Materials Engineering and Performance》1998,7(1):66-70
Lithium-containing aluminum alloys have shown promise for demanding aerospace applications because of their light weight,
high strength, and good damage tolerance characteristics. Additions of ceramic
reinforcements to an aluminum-lithium alloy can significantly enhance specific strength, and
specific modulus while concurrently offering acceptable performance at elevated temperatures. The
processing and fabrication of aluminum-lithium alloy-based composites are hampered by particulate agglomeration
or clustering and the existence of poor interfacial relationships between the reinforcing
phase and the matrix. The problem of distribution of the reinforcing phase in the metal matrix can be alleviated
by mechanical alloying. This article presents the results of a study aimed at addressing and improving
the interfacial relationship between the host matrix and the reinforcing phase. Copper-coated
silicon carbide particulates are introduced as the particulate reinforcing phase, and the resultant composite
mixture is processed by conventional milling followed by hot pressing and hot extrusion. The influence
of extrusion ratio and extrusion temperature on microstructure and mechanical properties was
established. Post extrusion processing by hot isostatic pressing was also examined. Results reveal the increase
in elastic modulus of the aluminum-lithium alloy matrix reinforced with copper-coated SiC to be
significantly more than the mechanically alloyed Al-Li/SiC counterpart. This suggests the possible contributions
of interfacial strengthening on mechanical response in direct comparison with a uniform distribution
of the reinforcing ceramic particulates. 相似文献
18.
Shanta Sastry M. Krishna Jayagopal Uchil 《Journal of Materials Engineering and Performance》2001,10(2):220-224
When the fabrication of a metal matrix composite (MMC) involves its cooling from a high temperature, plastic-elastic residual
deformation fields can be generated within and around the particle due to the differential thermal expansion between the particle
and matrix metal. The present investigation is concerned with the effect of thermal residual stresses on the thermal expansion
and damping behavior of aluminite particulate-reinforced ZA-27 alloy MMCs. Composites were prepared by the compocasting technique
with 1, 2, 3, and 4 wt.% of aluminite reinforcement. Thermal expansion and damping properties have been studied experimentally
as a function of temperature over a temperature range 30 to 300 °C both in the heating and cooling cycle. The thermal expansion
studies exhibited some residual strain, which increased with the increase in the weight percent of the reinforcement. The
damping capacity of both the composites and matrix alloy is found to increase with the increase in temperature during the
heating cycle, whereas in the cooling cycle, damping behavior exhibits a maximum, which becomes more pronounced with the increase
in the weight percentage of the reinforcement. The appearance of the maximum may be linked with dislocation generation and
motion as a result of plastic deformation of the matrix at the metal/reinforcement interface. This phenomenon is attributed
to the thermal stresses generated as a result of coefficient of thermal expansion (CTE) mismatch between the composite constituent
phases. The thermal stresses have been estimated in both the cases using simple models. 相似文献
19.
高熵合金是一种新型的结构与功能材料,源于金属-金属间天然的界面结合特性,高熵合金与铝合金基体间的界面润湿性极好。采用Al_(0.25)Cu_(0.75)FeNiCo高熵合金(HEA)颗粒作为增强相来增强铝合金,研究高熵合金含量变化对复合材料显微组织和力学性能的影响。结果表明:高熵合金增强相在基体中分布均匀,随着高熵合金体积分数的增大,局部会出现少量颗粒团聚现象。复合材料的弹性模量和硬度随着高熵合金含量的增加而增大,但复合材料的抗拉强度和延伸率呈现出先增大后减小的趋势。当高熵合金的体积分数为5%时,复合材料的极限抗拉强度和伸长率达到最大值(σb:437.6 MPa,ε:11.42%),比铝合金基体分别提高了20.1%和36.6%。TEM分析表明,高熵合金颗粒和铝合金良好的界面结合状态,使得复合材料具有较高的综合力学性能。 相似文献
20.
《稀有金属(英文版)》2017,(10)
Titanium matrix(Ti6A14V) composites reinforced with TiB_2 and TiC were produced through powder metallurgy method. The effect of addition of both TiB_2 and TiC with different contents(2.5 wt% 5.0 wt% and7.5 wt%) on the density, microstructure and hardness properties of titanium matrix was investigated. The size distributions of the matrix alloy and reinforcement particles were measured by particle size analyzer. Microhardness of the sintered composites was evaluated using Vickers' s hardness tester with a normal load of 3 N and a dwell time of 10 s. Ti6A14V alloy and Ti6A14V/TiB_2-TiC composites were characterized through X-ray diffraction(XRD) and field emission scanning electron microscope(FESEM)equipped with energy-dispersive spectrometer(EDS). The addition of TiB_2 and TiC particles enriches the properties of Ti6A14V alloy. The sintered Ti6A14V/TiB_2-TiC composite features a dense and pore-free microstructure with varying TiB_2 and TiC particle distribution in the metal matrix. The results of this study show that the development of new phases plays a significant role in the properties of these composite materials. 相似文献