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| 1 | Evaluation of the microstructure,thermal and mechanical properties of Cu/SiC nanocomposites fabricated by mechanical alloying显示文摘Nano-sized silicon carbide(SiC:0wt%,1wt%,2wt%,4wt%,and 8wt%)reinforced copper(Cu)matrix nanocomposites were manufactured,pressed,and sintered at 775 and 875℃in an argon atmosphere.X-ray diffraction(XRD)and scanning electron microscopy were performed to characterize the microstructural evolution.The density,thermal expansion,mechanical,and electrical properties were studied.XRD analyses showed that with increasing SiC content,the microstrain and dislocation density increased,while the crystal size decreased.The coefficient of thermal expansion(CTE)of the nanocomposites was less than that of the Cu matrix.The improvement in the CTE with increasing sintering temperature may be because of densification of the microstructure.Moreover,the mechanical properties of these nanocomposites showed noticeable enhancements with the addition of SiC and sintering temperatures,where the microhardness and apparent strengthening efficiency of nanocomposites containing 8wt%SiC and sintered at 875℃were 958.7 MPa and 1.07 vol%^(−1),respectively.The electrical conductivity of the sample slightly decreased with additional SiC and increased with sintering temperature.The prepared Cu/SiC nanocomposites possessed good electrical conductivity,high thermal stability,and excellent mechanical properties. | Essam B.Moustafa Mohammed A.Taha | 2021 | International Journal of Minerals,Metallurgy and Materials2021，28，3： | 4 |
| 2 | 热挤压对Al_(2)O_(3p)增强7075铝基复合材料微观组织和摩擦学行为的影响显示文摘通过光学显微镜(OM)、扫描电子显微镜(SEM)、能谱仪(EDS)和透射电子显微镜(TEM)研究了热挤压和Al_(2)O_(3p)的添加对7075复合材料的微观结构和摩擦学行为的影响。实验结果表明,Al_(2)O_(3p)的最佳添加量为2%(质量分数)。经热挤压后,Mg(Zn,Cu,Al)2相部分溶解到基体中,并且产生了许多均匀分布的时效析出颗粒,Al_(7)Cu_(2)Fe相被挤压并破碎,Al_(2)O_(3p)分布变得均匀。2%质量分数的Al_(2)O_(3p)/7075复合材料的显微硬度达到HV 170.34,相比铸态复合材料提高了41.5%。在相同条件下,挤压态2%质量分数的Al_(2)O_(3p)/7075复合材料的磨损率比铸态复合材料的磨损率更低。SEM-EDS分析表明,复合材料耐磨性的增强主要取决于Al_(2)O_(3p)增强的过渡层的保护作用。经过热挤压后,摩擦过渡层变得稳定,这使得挤压态复合材料的耐磨性增强。 | 雷雨顺 闫洪 魏志帆 熊俊杰 张鹏翔 万剑平 王志录 | 2021 | Journal of Central South University2021，28，8： | 3 |
| 3 | Microstructure and Tribological Behavior of Al2O3 Particle Reinforced Al Matrix Composites Fabricated by Spark Plasma Sintering显示文摘Nanoparticles and microparticles reinforced Al matrix composites were fabricated by spark plasma sintering, and the microstructure and tribological properties were investigated systemically. The nano-Al2O3 particle and micro-Al2O3 particle uniformly dispersed in Al matrix composites. The introduction of nanoparticles is beneficial to the decrease of friction coefficient and wear rate, while microparticles are responsible to the high friction coefficient, resulting in the abrasive wear. With the introduction of both nanoparticles and microparticles, their synergic effect will lead to the variation of tribological behavior. | 杨坤 AN Linan CHENG Laifei | 2019 | Journal of Wuhan University of Technology(Materials Science)2019，34，5： | 2 |
| 4 | 后热处理对搅拌摩擦加工制备Al-Ti复合材料组织特征的影响显示文摘采用搅拌摩擦加工技术制备Al-Ti复合材料,并对其进行600℃/6h的后热处理,采用SEM、TEM、XRD对搅拌摩擦区热处理前后的微观组织结构及相进行了分析;采用X射线衍射图分析软件TOPAS测量了搅拌区热处理前后的物相晶格常数,研究了后热处理对搅拌摩擦加工制备的Al-Ti复合材料组织特征的影响。结果表明:600℃/6h后热处理后,金属间化合物与铝基结合界面良好;且后热处理可使Ti、Al和Al_3Ti彼此间的扩散速率加快,促进Al_3Ti和新相Al_5Ti_2金属间化合物的产生;此外微观结构中存在位错墙;热处理前后Al_3Ti的轴向比c/a都高于标准数据,但热处理后提高了约0.4%,明显低于热处理前约1.2%的增幅;进行后热处理后,Al-Ti复合材料因搅拌摩擦加工引发的微观缺陷的增殖、再次扩散及缺陷间的互作用,使得原位反应再次进行,促使搅拌区金属间化合物含量提高。 | 黄硕文 黄春平 吴中文 夏春 刘奋成 柯黎明 | 2018 | 材料导报2018，32，22： | 2 |
| 5 | 固溶处理对Al2O3/7075复合材料的组织及力学性能的影响显示文摘采用球磨预制块和高能超声等方法制备了Al2O3含量为2.0%的7075复合材料,通过SEM、EDS、拉伸及硬度测试等方法,研究了固溶处理对Al2O3/7075复合材料显微组织和力学性能的影响。结果表明,随着固溶温度和时间的增加,Al2O3/7075复合材料中第二相Mg(Zn,Cu,Al)2逐渐溶入基体中。与Al2O3/7075复合材料相比,经460℃×5h固溶处理的Al2O3/7075复合材料的硬度、抗拉强度和伸长率分别提高了37.2%、19.0%和46.2%。 | 涂凯 闫洪 吉顺 喻保标 魏志帆 刘宇航 | 2019 | 特种铸造及有色合金2019，39，12： | 1 |
| 6 | Al_(2)O_(3)(p)增强Al基复合材料的制备及力学性能显示文摘通过超声振动辅助制备Al_(2)O_(3)(p)增强2024复合材料,研究了制备工艺和Al_(2)O_(3)(p)对复合材料微观组织和力学性能的影响。结果显示,施加超声振动和加入Al_(2)O_(3)(p)可明显细化复合材料的微观组织。随着Al_(2)O_(3)(p)含量的增大,复合材料α-Al相尺寸先减小后增大,显微硬度、抗拉强度、屈服强度和伸长率均先增大后减小,当Al_(2)O_(3)(p)含量为1.5%时,均达到极大值,过量的Al_(2)O_(3)(p)加入会导致Al_(2)O_(3)(p)的团聚。复合材料显微硬度和力学性能的提高是超声振动和Al_(2)O_(3)(p)引起的细晶强化、颗粒强化和晶界强化的协同作用。 | 李晓微 吴和保 | 2023 | 铸造2023，72，4： | 0 |
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