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Pulse-Impact on Microstructure of Liquid-Phase-Pulse-Impact Diffusion Welded Joints of Particle Reinforcement Aluminum Matrix Composites at Various Temperatures
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作者 Kelvii Wei Guo 《Engineering(科研)》 2013年第7期567-576,共10页
Investigation was to study the influence of pulse-impact on microstructure of Liquid-Phase-Pulse-Impact Diffusion Welding (LPPIDW) welded joints of aluminum matrix composite SiCp/A356, SiCp/6061Al, Al2O3p/6061Al. Resu... Investigation was to study the influence of pulse-impact on microstructure of Liquid-Phase-Pulse-Impact Diffusion Welding (LPPIDW) welded joints of aluminum matrix composite SiCp/A356, SiCp/6061Al, Al2O3p/6061Al. Results showed that under the effect of pulse-impact: 1) the interface state between reinforcement particle (SiC, Al2O3) and matrix was prominently;2) the initial pernicious contact-state of reinforcement particles was changed from reinforcement (SiC, Al2O3)/reinforcement (SiC, Al2O3) to reinforcement (SiC, Al2O3)/matrix/ reinforcement (SiC, Al2O3);3) the density of dislocation in the matrix neighboring to and away from the interface in the matrix was higher than its parent composite;and 4) the intensively mutual entwisting of dislocation was occurred. Studies illustrated that: 1) deformation was mainly occurred in the matrix grain;and 2) under the effect of pulse-impact, the matrices around reinforcement (SiC, Al2O3) particles engendered intensive aberration offered a high density nucleus area for matrix crystal, which was in favor of forming nano-grains and improved the properties of the successfully welded composite joints. 展开更多
关键词 Aluminum matrix composite particle reinforcement Pulse-Impact MICROSTRUCTURE Diffusion Welding
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PARTICULATE SIZE EFFECTS IN THE PARTICLE-REINFORCED METAL-MATRIX COMPOSITES 被引量:13
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作者 魏悦广 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2001年第1期45-58,共14页
The influences of I,article size on the mechanical properties of the particulate metal matrix composite;are obviously displayed in the experimental observations. However, the phenomenon can not be predicted directly u... The influences of I,article size on the mechanical properties of the particulate metal matrix composite;are obviously displayed in the experimental observations. However, the phenomenon can not be predicted directly using the conventional elastic-plastic theory. It is because that no length scale parameters are involved in the conventional theory. In the present research, using the strain gradient plasticity theory, a systematic research of the particle size effect in the particulate metal matrix composite is carried out. The roles of many composite factors, such as: the particle size, the Young's modulus of the particle, the particle aspect ratio and volume fraction, as well as the plastic strain hardening exponent of the matrix material, are studied in detail. In order to obtain a general understanding for the composite behavior, two kinds of particle shapes, ellipsoid and cylinder, are considered to check the strength dependence of the smooth or non-smooth particle surface. Finally, the prediction results will be applied to the several experiments about the ceramic particle-reinforced metal-matrix composites. The material length scale parameter is predicted. 展开更多
关键词 size effect strain gradient plasticity the particle-reinforced metal-matrix composite
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Microstructure and wear characteristics of ATZ ceramic particle reinforced gray iron matrix surface composites 被引量:3
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作者 Xue Ma Liang-feng Li +3 位作者 Fan Zhang Zu-hua Zhang Hao Wang En-ze Wang 《China Foundry》 SCIE 2018年第3期167-172,共6页
The alumina toughened zirconia(ATZ) ceramic particle reinforced gray iron matrix surface composite was successfully manufactured by pressureless infi ltration. The porous preform played a key role in the infi ltrating... The alumina toughened zirconia(ATZ) ceramic particle reinforced gray iron matrix surface composite was successfully manufactured by pressureless infi ltration. The porous preform played a key role in the infi ltrating progress. The microstructure was observed by scanning electron microscopy(SEM); the phase constitutions was analyzed by X-ray diffraction(XRD); and the hardness and wear resistance of selected specimens were tested by hardness testing machine and abrasion testing machine, respectively. The addition of high carbon ferrochromium powders leads to the formation of white iron during solidifi cation. The wear volume loss rates of ATZ ceramic particle reinforced gray iron matrix surface composite decreases fi rst, and then tends to be stable. The wear resistance of the composite is 2.7 times higher than that of gray iron matrix. The reason is a combination of the surface hardness increase of gray iron matrix and ATZ ceramic particles and alloy carbides protecting effect on gray iron matrix. 展开更多
关键词 metal-matrix SURFACE composites pressureless infiltrating particle-reinforcement SURFACE ALLOYING WEAR testing
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Cavitation-erosion mechanism of laser cladded SiC particle reinforced metal matrix composite 被引量:2
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作者 张春华 张松 +3 位作者 杨洪刚 朱圣龙 文效忠 才庆魁 《中国有色金属学会会刊:英文版》 CSCD 2005年第1期35-39,共5页
With 2 kW continuous wave Nd-YAG laser, SiC ceramic powder was laser-cladded on the AA6061 aluminium alloy surface. Within the range of process parameters investigated, the parameters were optimized to produce the SiC... With 2 kW continuous wave Nd-YAG laser, SiC ceramic powder was laser-cladded on the AA6061 aluminium alloy surface. Within the range of process parameters investigated, the parameters were optimized to produce the SiC_p reinforced metal matrix composites(MMC) modified layer on AA6061 alloy surface. After being treated, the modified layer is crack-free, porosity-free, and has good metallurgical bond with the substrate. The microstructure and chemical composition of the modified layer were analyzed by such detection devices as scanning electronic microscope(SEM-EDX) and X-ray diffractometer(XRD). The performance of electrochemical corrosion and cavitation erosion and their mechanism were estimated by the microhardness tester, potentiostat and (ultrasonic-)(induced) cavitation device. 展开更多
关键词 铝合金 激光镀膜 金属模版复合物 粒子加固 气蚀酌
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Damage analysis for particle reinforced metal matrix composite by ultrasonic method 被引量:2
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作者 杨治国 龙士国 《中国有色金属学会会刊:英文版》 CSCD 2006年第B02期652-655,共4页
The damage characteristic of particle reinforced metal matrix composite (PMMC) was studied by ultrasonic non-destructive evaluation method. After the sample was damaged induced by tensile load, the ultrasonic wave tha... The damage characteristic of particle reinforced metal matrix composite (PMMC) was studied by ultrasonic non-destructive evaluation method. After the sample was damaged induced by tensile load, the ultrasonic wave that propagated in the sample were collected. The damage parameter was defined by ultrasonic parameter and the wave signals were analyzed by correlation method. The results show that with the increase of tensile load, the damage parameter increases and the correlation coefficient decreases. The fracture section morphologies of PMMC under tensile load were observed by SEM. It is found that there are many concaves in the metal matrix. Therefore the damage evolution can be concluded. The initial damage is induced by void nucleation, growth and subsequent coalescence in the matrix or interface separation. 展开更多
关键词 颗粒增强金属基复合材料 损伤分析 超声法 非破坏性试验
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Pseudo-in-situ stir casting: a new method for production of aluminum matrix composites with bimodal-sized B_4C reinforcement 被引量:1
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作者 Mohammad Raei Masoud Panjepour Mahmood Meratian 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2016年第8期981-990,共10页
A new method was applied to produce an Al-0.5wt%Ti-0.3wt%Zr/5vol%B_4C composite via stir casting with the aim of characterizing the microstructure of the resulting composite. For the production of the composite, large... A new method was applied to produce an Al-0.5wt%Ti-0.3wt%Zr/5vol%B_4C composite via stir casting with the aim of characterizing the microstructure of the resulting composite. For the production of the composite, large B4 C particles(larger than 75 μm) with no pre-heating were added to the stirred melt. Reflected-light microscopy, X-ray diffraction, scanning electron microscopy, field-emission scanning electron microscopy, laser particle size analysis, and image analysis using the Clemex software were performed on the cast samples for microstructural analysis and phase detection. The results revealed that as a consequence of thermal shock, B_4 C particle breakage occurred in the melt. The mechanism proposed for this phenomenon is that the exerted thermal shock in combination with the low thermal shock resistance of B_4 C and large size of the added B_4 C particles were the three key parameters responsible for B_4 C particle breakage. This breakage introduced small particles with sizes less than 10 μm and with no contamination on their surfaces into the melt. The mean particle distance measured via image analysis was approximately 60 μm. The coefficient of variation index, which was used as a measure of particle distribution homogeneity, showed some variations, indicating a relatively homogeneous distribution. 展开更多
关键词 metal matrix composites particle-reinforced composites boron carbide casting thermal shock
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Study on Diffusion Welding Parameters of Particle reinforced Aluminium Matrix Composite Al_2O_(3p) /6061Al
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作者 刘黎明 牛济泰 韩立红 《Rare Metals》 SCIE EI CAS CSCD 1999年第4期299-304,共6页
Effects of diffusion welding process parameters on strength of welded joint based on particle reinforced aluminium matrix composite Al 2O 3p /6061Al have been studied through comparing with aluminium matrix allo... Effects of diffusion welding process parameters on strength of welded joint based on particle reinforced aluminium matrix composite Al 2O 3p /6061Al have been studied through comparing with aluminium matrix alloy. The mechanism for loss of joint strength has been analyzed. It should be pointed out that key processing parameters affecting the strength of joint was welding temperature. The high quality joint can be successfully obtained with appropriate diffusion welding parameters. 展开更多
关键词 particle reinforced aluminium matrix composite Diffusion welding Oxide film
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A Review on Particle Reinforced Mg Matrix Composites Fabricated by Powder Metallurgy
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作者 Zhiyuan Liu Li Jin +4 位作者 Jian Zeng Fulin Wang Fenghua Wang Shuai Dong Jie Dong 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2024年第3期391-400,共10页
This paper provides a comprehensive review of research progress in particle-reinforced Mg matrix composites prepared via powder metallurgy.The article discusses different strategies,such as micro-sized,nano-sized part... This paper provides a comprehensive review of research progress in particle-reinforced Mg matrix composites prepared via powder metallurgy.The article discusses different strategies,such as micro-sized,nano-sized particles,and multi-particle hybridization,which has been employed to enhance the performance of the composites.In addition,a range of preparation techniques that optimize the dispersion of the reinforcing particles are summarized.The paper also highlights how the different configurations between the reinforcements and matrix alloy impact the composites’performance.Finally,the article outlines the prospects of particles reinforced Mg matrix composites fabricated via powder metallurgy and recommends modification methods that could be explored to further develop these materials for various applications. 展开更多
关键词 Magnesium matrix composites Reinforcing particle Powder metallurgy Mechanical properties CONFIGURATION
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Processing of nanostructured metallic matrix composites by a modified accumulative roll bonding method with structural and mechanical considerations 被引量:3
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作者 Amir Hossein Yaghtin Erfan Salahinejad Ali Khosravifard 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2012年第10期951-956,共6页
Particulate reinforced metallic matrix composites have attracted considerable attention due to their lightweight, high strength, high specific modulus, and good wear resistance. A1/B4C composite strips were produced i... Particulate reinforced metallic matrix composites have attracted considerable attention due to their lightweight, high strength, high specific modulus, and good wear resistance. A1/B4C composite strips were produced in this work by a modified accumulative roll bonding process where the strips were rotated 90° around the normal direction between successive passes. Transmission electron microscopy and X-ray diffraction analyses reveal the development of nanostructures in the Al matrix after seven passes. It is found that the B4C reinforcement distribution in the matrix is improved by progression of the process. Additionally, the tensile yield strength and elongation of the processed materials are increased with the increase of passes. 展开更多
关键词 metallic matrix composites particle reinforced composites NANOSTRUCTURES ALUMINUM boron carbide roll bonding tensile properties
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STUDY ON DIFFUSION WELDING OF ALUMINIUN MATRIX COMPOSITE 被引量:4
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作者 J. T. Niu L. M. Liu +2 位作者 J. P. Zhai J. Yu X. M. Zhang (National Key Laboratory of Advanced Welding Production Technology, HIT, Harbin 750001, China) 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2000年第1期12-17,共6页
Effects of diffusion welding parameters on strength of welded joint based on particle reinforced alumini- um matrix composite Al2O3p/6061Al were studied by comparing with aluminium matrix alloy,Mecha- nism for ... Effects of diffusion welding parameters on strength of welded joint based on particle reinforced alumini- um matrix composite Al2O3p/6061Al were studied by comparing with aluminium matrix alloy,Mecha- nism for the loss of joint strength was analyzed.It was pointed out that the key processing parameters affecting the strength of joint was the welding temperature.The high quality joint can be successfully obtained with appropriate diffusion welding parameters. 展开更多
关键词 particle reinforced aluminium matrix composite diffusion welding oxide film
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Fabrication and densification enhancement of SiC-particulate-reinforced copper matrix composites prepared via the sinter-forging process 被引量:1
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作者 Mohammadmehdi Shabani Mohammad Hossein Paydar Mohammad Mohsen Moshksar 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2014年第9期934-939,共6页
The fabrication of copper (Cu) and copper matrix silicon carbide (Cu/SiCp) particulate composites via the sinter-forging process was investigated. Sintering and sinter-forging processes were performed under an ine... The fabrication of copper (Cu) and copper matrix silicon carbide (Cu/SiCp) particulate composites via the sinter-forging process was investigated. Sintering and sinter-forging processes were performed under an inert Ar atmosphere. The influence of sinter-forging time, temperature, and compressive stress on the relative density and hardness of the prepared samples was systematically investigated and subsequently compared with that of the samples prepared by the conventional sintering process. The relative density and hardness of the composites were enhanced when they were prepared by the sinter-forging process. The relative density values of all Cu/SiCp composite samples were observed to decrease with the increase in SiC content. 展开更多
关键词 metallic matrix composites particle reinforced composites silicon carbide FORGING SINTERING bulk density
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Thermal Expansion and Mechanical Properties of Middle Reinforcement Content SiCp/Al Composites Fabricated by PM Technology 被引量:1
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作者 郝世明 谢敬佩 +3 位作者 WANG Aiqin WANG Wenyan LI Jiwen SUN Haoliang 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2014年第4期660-664,共5页
Middle reinforcement content SiCp/Al composites(Vp=30%, 35% and 40%) for precision optical systems applications were fabricated by powder metallurgy technology. The composites were free of porosity and SiC particles... Middle reinforcement content SiCp/Al composites(Vp=30%, 35% and 40%) for precision optical systems applications were fabricated by powder metallurgy technology. The composites were free of porosity and SiC particles distributed uniformly in the composites. The mean linear coefficients of thermal expansion(20-100 ℃) of SiCp/Al composites ranged from 11.6×10-6 to 13.3×10-6 K-1 and decreased with an increase in volume fraction of SiC content. The experimental coeffi cients of thermal expansion agreed well with predicted values based on Kerner's model. The Brinell hardness increased from 116 to 147, and the modulus increased from 99 to 112 GPa for the corresponding composites. The tensile strengths were higher than 320 MPa, but no signifi cant increasing trend between tensile strength and SiC content was observed. 展开更多
关键词 metal-matrix composites particle-reinforcement coefficient of thermal expansion mechanical properties powder metallurgy
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混杂颗粒增强Ni基复合材料的冲蚀磨损性能研究
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作者 曹洪治 陈华辉 +1 位作者 马文星 范磊 《矿业科学学报》 CSCD 北大核心 2024年第4期619-630,共12页
煤炭开采、石油化工等极端工况条件下的机械装备对部分关键零部件材料的磨损性能提出了更高要求。本研究设计制备了大尺寸氧化锆颗粒(ZTAp)承载与小尺寸碳化钨颗粒(WCp)强化基体相结合的混杂颗粒增强金属基复合材料,研究了介质、冲蚀角... 煤炭开采、石油化工等极端工况条件下的机械装备对部分关键零部件材料的磨损性能提出了更高要求。本研究设计制备了大尺寸氧化锆颗粒(ZTAp)承载与小尺寸碳化钨颗粒(WCp)强化基体相结合的混杂颗粒增强金属基复合材料,研究了介质、冲蚀角度、ZTAp尺寸、WCp含量对复合材料冲蚀磨损性能的影响及其机理。结果表明,适量ZTAp、WCp的添加能够显著提高复合材料的抗冲蚀磨损性能。固定体积分数的ZTA颗粒,尺寸越大,复合材料冲蚀磨损性能越好,其主要失效形式为脆性剥落和疲劳断裂。WC颗粒通过第二相增强、固溶强化以及析出强化的方式,提高了基体的硬度和耐磨性,抑制了酸性介质中腐蚀与磨损的交互作用,冲蚀过程中主要失效形式为脆性断裂剥落。 展开更多
关键词 混杂颗粒增强 金属基复合材料 耐冲蚀磨损性能
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铝酸盐体系中氧化时间对碳化硅颗粒增强铝基复合材料微弧氧化膜层的影响
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作者 杜春燕 孙焕明 +1 位作者 黄树涛 刘成炜 《电镀与涂饰》 CAS 北大核心 2024年第8期70-78,共9页
[目的]探究氧化时间对碳化硅颗粒增强铝基(SiC_(p)/Al)复合材料微弧氧化膜层的影响。[方法]选用铝酸盐体系作为电解液,对SiC_(p)/Al复合材料进行微弧氧化处理,分析氧化时间对膜层组织结构、物相、厚度、粗糙度、结合力、电绝缘性及耐蚀... [目的]探究氧化时间对碳化硅颗粒增强铝基(SiC_(p)/Al)复合材料微弧氧化膜层的影响。[方法]选用铝酸盐体系作为电解液,对SiC_(p)/Al复合材料进行微弧氧化处理,分析氧化时间对膜层组织结构、物相、厚度、粗糙度、结合力、电绝缘性及耐蚀性的影响。[结果]随着氧化时间延长,膜层逐渐变得连续均匀,厚度增加。若氧化时间过长,膜层会出现层叠现象,形成大尺寸微孔及裂纹,且生长速率越来越低。膜层结合力随氧化时间延长先增大后减小,在60 min时最大,达到39.85 N。氧化时间为10 min时,膜层的电绝缘性及耐蚀性最优,100 V和500 V电压下的绝缘电阻分别达到3.11×10^(12)Ω和1.41×10^(12)Ω,腐蚀电位为-0.6298 V,腐蚀电流密度为1.332×10^(-7)A/cm^(2)。[结论]SiC_(p)/Al复合材料表面微弧氧化膜层的连续性、均匀性及生长速率均与氧化时间有关。需选择合适的氧化时间,才能制备出连续、均匀且综合性能优异的膜层。 展开更多
关键词 碳化硅颗粒增强铝基复合材料 微弧氧化 时间 厚度 结合力 电绝缘性 耐蚀性
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考虑颗粒团聚影响的聚合物基复合材料温度相关性拉伸断裂强度理论表征模型
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作者 徐超 董攀 +3 位作者 巫运韬 王如转 李莹 李卫国 《重庆大学学报》 CAS CSCD 北大核心 2024年第8期132-140,共9页
聚合物基复合材料在不同温度下的拉伸断裂强度一直是人们关注的焦点,颗粒作为一种常见增强相可以显著提高聚合物基复合材料的拉伸断裂强度。然而,随着颗粒体积分数的增加,颗粒将会发生团聚现象,从而影响增强效果。针对颗粒增强聚合物基... 聚合物基复合材料在不同温度下的拉伸断裂强度一直是人们关注的焦点,颗粒作为一种常见增强相可以显著提高聚合物基复合材料的拉伸断裂强度。然而,随着颗粒体积分数的增加,颗粒将会发生团聚现象,从而影响增强效果。针对颗粒增强聚合物基复合材料,通过计及颗粒团聚的影响,以及材料热物理性能随温度的演化,建立了一个考虑团聚影响的温度相关性拉伸断裂强度理论表征模型。模型得到了实验数据的良好验证。研究成果为定量表征不同颗粒含量、不同温度下复合材料的拉伸断裂强度提供了一种有效途径,加深了对不同温度下团聚现象对复合材料力学性能影响的认识。 展开更多
关键词 颗粒增强 聚合物基复合材料 温度相关性 团聚 拉伸断裂强度
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60%SiCp/2009铝基复合材料表面等离子体电解氧化膜的生长和表征
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作者 廖燚钊 王兴平 +6 位作者 高川力 周茜 徐驰 金小越 杜建成 薛文斌 张永忠 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2024年第2期435-452,共18页
在硅酸盐溶液中采用等离子体电解氧化技术在60%SiCP(体积分数)/2009铝基复合材料表面制备陶瓷膜。研究氧化膜的显微组织、成分、润湿性及其耐腐蚀性能,探讨SiC颗粒表面火花放电的产生机理。结果表明,来自硅酸盐溶液的不溶性化合物(SiO_(... 在硅酸盐溶液中采用等离子体电解氧化技术在60%SiCP(体积分数)/2009铝基复合材料表面制备陶瓷膜。研究氧化膜的显微组织、成分、润湿性及其耐腐蚀性能,探讨SiC颗粒表面火花放电的产生机理。结果表明,来自硅酸盐溶液的不溶性化合物(SiO_(2))使SiC颗粒表面产生火花放电,Al-Si-O化合物中的缺陷为SiC颗粒表面放电电流的传导提供优先路径。1200s时铝基复合材料表面形成5.5μm厚的均匀膜层,膜层的表面自由能在40s时达到最大值37.10 m J/cm^(2),并在1200 s时下降到25.95 m J/cm^(2)。此外,等离子体电解氧化处理可以显著提高复合材料的耐蚀性。 展开更多
关键词 等离子体电解氧化 铝基复合材料 SiC增强颗粒 火花放电 润湿性 耐蚀性
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原位合成颗粒增强铜基复合材料的研究进展
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作者 崔童 杜善豪 +3 位作者 钱高祥 张宇博 王同敏 李廷举 《铜业工程》 CAS 2024年第2期131-138,共8页
弥散强化型铜基复合材料,兼具优异的导电导热性能、高强度、良好的热稳定性和耐磨性,是核反应堆、航空器及高端装备中各种导电导热元件的关键材料,在核电、航空、交通、军事等诸多重要领域有不可替代的作用。原位合成法是在一定温度下... 弥散强化型铜基复合材料,兼具优异的导电导热性能、高强度、良好的热稳定性和耐磨性,是核反应堆、航空器及高端装备中各种导电导热元件的关键材料,在核电、航空、交通、军事等诸多重要领域有不可替代的作用。原位合成法是在一定温度下金属基体内发生化学反应,原位生成一种或几种陶瓷增强体的技术。原位反应制备颗粒增强铜基复合材料存在两个重要的问题亟待解决:一是增强相的团聚问题,二是增强相的尺寸调控问题。本文总结了几种较为常用的制备弥散强化型铜基复合材料的原位合成方法,并对比分析了几种方法的特点、优劣及技术难点。同时,本文综述了原位合成法对铜基复合材料中颗粒尺寸和分布的影响,分析了原位合成法不同参数对复合材料力学及综合性能的影响规律,并从增强相颗粒形核与生长的原理出发,提出了促成细小弥散颗粒增强相的工艺方案。 展开更多
关键词 原位合成法 铜基复合材料 颗粒增强 高强高导 物理外场
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颗粒增强铝基复合材料热等静压近净成形有限元模拟
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作者 冯效铭 张峻凡 +2 位作者 王东 肖伯律 马宗义 《精密成形工程》 北大核心 2024年第4期1-9,共9页
目的建立可靠的模拟方法,以更高效地预测颗粒增强铝基复合材料(PRAMC)粉末热等静压中的形状变化和不同部位致密度的差异,解决传统实验试错方法适用性差且费时费力的问题,满足批量应用的需求。方法以45%(体积分数)SiCp/6092Al复合材料为... 目的建立可靠的模拟方法,以更高效地预测颗粒增强铝基复合材料(PRAMC)粉末热等静压中的形状变化和不同部位致密度的差异,解决传统实验试错方法适用性差且费时费力的问题,满足批量应用的需求。方法以45%(体积分数)SiCp/6092Al复合材料为研究对象,构建了能预测粉末热等静压成形过程的有限元模型。使用Gurson-Tvergard-Needleman(GTN)模型作为粉末本构模型,建立了粉末尺度的代表性体积单元(RVE)对GTN模型进行修正。结果通过对比GTN模型计算结果与实验结果,发现修正后的GTN模型能更准确地预测模型的最终变形尺寸,与修正前相比,相对误差降低了1.6%~2.9%。使用修正后的GTN模型对杯形回转体零件的热等静压成形过程进行预测,最终形状的计算结果与实验结果的相对误差仅为0.2%~3.1%,致密度分布的相对误差在0.5%以内。在探究包套厚度对热等静压过程的影响时发现,随着包套厚度的增大,热等静压过程中的屏蔽作用增强,内部粉体致密度下降。结论为PRAMC热等静压近终形制备的形状和致密度控制问题提供了有限元预测工具,辅助优化了热等静压工艺和包套设计,降低了颗粒增强铝基复合材料热等静压近净成形过程开发的试错成本。 展开更多
关键词 颗粒增强铝基复合材料 粉末冶金 体积代表单元 GTN模型 近净成形
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碳纤维增强树脂基复合材料的层间颗粒增韧技术研究进展
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作者 赵涵怡 柯红军 +2 位作者 汪东 张洋 李琪 《材料导报》 EI CAS CSCD 北大核心 2024年第S01期575-582,共8页
碳纤维增强树脂基复合材料(CFRP)具有高强高模的优点,被广泛应用于汽车、体育、船舶、航空航天等领域,达到了材料轻量化的要求。目前使用较多的树脂基体以环氧树脂(EP)等热固性树脂为代表,普遍存在脆性大、韧性差的问题,导致复合材料层... 碳纤维增强树脂基复合材料(CFRP)具有高强高模的优点,被广泛应用于汽车、体育、船舶、航空航天等领域,达到了材料轻量化的要求。目前使用较多的树脂基体以环氧树脂(EP)等热固性树脂为代表,普遍存在脆性大、韧性差的问题,导致复合材料层合板容易在层间发生开裂。层间增韧是一种有效的增韧方式,它可以在不改变基体树脂粘度的情况下对特定区域进行增韧,提高材料的断裂韧性。本文介绍了层间断裂模式并总结了层间断裂韧性(ILFT)测试的数据处理方法,总结了聚合物颗粒与无机纳米颗粒(主要是碳纳米管)的颗粒种类、增韧机制、引入方式,并主要通过层间断裂韧性评价了各种颗粒的增韧效果。 展开更多
关键词 碳纤维增强树脂基复合材料 层间增韧 层间断裂韧性 聚合物颗粒 无机纳米颗粒 碳纳米管
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TiB_(2)颗粒增强6061铝合金的组织及力学性能
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作者 郝志飞 刘志伟 +6 位作者 解佩佩 余申卫 何源 董其娟 魏作山 李政霖 尚金翅 《热加工工艺》 北大核心 2024年第5期136-141,146,共7页
TiB_(2)颗粒对铝合金有良好的强化作用。通过超声辅助重熔稀释法制备TiB_(2)/6061复合材料,研究了TiB_(2)颗粒对铸态及挤压T6热处理态6061铝合金的微观组织及力学性能的影响。研究结果表明:添加2wt%TiB2颗粒后,铸态平均晶粒尺寸从未添加... TiB_(2)颗粒对铝合金有良好的强化作用。通过超声辅助重熔稀释法制备TiB_(2)/6061复合材料,研究了TiB_(2)颗粒对铸态及挤压T6热处理态6061铝合金的微观组织及力学性能的影响。研究结果表明:添加2wt%TiB2颗粒后,铸态平均晶粒尺寸从未添加TiB_(2)的355.7μm细化至117.5μm;TiB_(2)颗粒可以促进再结晶过程中的形核,并抑制晶粒长大;挤压热处理态TiB_(2)/6061复合材料的屈服强度为330 MPa、抗拉强度为385 MPa,相比未添加TiB_(2)的合金分别提高了11.8%和7.0%,其主要强化方式为热错配强化和Orowan强化。 展开更多
关键词 TiB_(2)颗粒增强铝基复合材料 6061铝合金 热挤压 热处理
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