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Welding of SiC particle reinforced 6061 Al matrix composite with pulsed TIG

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中国有色金属学会会刊：英文版 2002年第5期12卷 805-810页

作者：陈茂爱武传松高进强 Shandong University The Key Laboratory of Liquid Structure and Heredity of Materials Ministry of Education Ji'nan 250061

SiC p/6061Al alloy composite was welded by using TIG and pulsed-TIG welding (P-TIG) without addition of filler metal, or with addition of Al-Si or Al-Mg filler metal. The microstructure and properties of the weld were investigated with XRD, OM, TEM, and MTS-810 testing system was used to observe the effect of different welding procedure and filler metals on the microstructure and properties of the weld. Thermodynamic of SiC-Al reaction was used to analyze the tendency of the reaction between SiC particle and Al matrix during welding. The results showed that the P-TIG tends to produce less plate-like Al 4C 3 precipitates than TIG; when welding with P-TIG, addition of Al-Si filler metal can not only prevent from formation of Al 4C 3, but also decrease hot crack sensitivity of weld; the tensile strength of joint of adding Al-Si filler metal is higher than that of adding Al-Mg filler metal. The SiC p/6061Al composite can be successfully welded by P-TIG with addition of Al-Si filler metal.

关键词： SiCp/6061Al 碳化硅 6061铝复合物焊料晶粒强化界面反应铝合金

Ti3SiC2p/ZL109复合材料组织及摩擦磨损性能研究

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Ti3SiC2p/ZL109复合材料组织及摩擦磨损性能研究

作者：张凯华西安石油大学

学位级别：硕士

ZL109是一种近共晶Al-Si合金,具有优良的铸造性能和力学性能,在汽车发动机活塞制造以及航空航天等领域有着广泛的应用。随着交通运输行业向着大功率、高速发展,单一铝合金已经很难满足在此条件下的耐磨性能。颗粒增强铝基复合材料是一... 详细信息

ZL109是一种近共晶Al-Si合金,具有优良的铸造性能和力学性能,在汽车发动机活塞制造以及航空航天等领域有着广泛的应用。随着交通运输行业向着大功率、高速发展,单一铝合金已经很难满足在此条件下的耐磨性能。颗粒增强铝基复合材料是一种有效提高铝基复合材料摩擦以及力学性能的方法,但传统的陶瓷颗粒由于与Al基体湿润性较差,摩擦学性能不能达到理想要求。因此,新型陶瓷颗粒MAX相增强铝基复合材料的研究和探索已经成为提高该领域的重中之重。本篇文章选用超声搅拌铸造法制备不同含量的TiSiC陶瓷颗粒增强ZL109复合材料,并对该材料进行T6热处理。研究了TiSiC颗粒及其含量以及T6热处理工艺对材料显微组织、力学性能和摩擦学性能的影响,阐明了TiSiC/ZL109复合材料和T6热处理后TiSiC/ZL109复合材料的强韧化机制和磨损机理,深入探究了显微组织、力学性能和摩擦学性能三者之间的关联性。研究结果如下:基体ZL109中存在α-Al、初生Si、共晶Si、块状AlCu和有害富Fe相α-AlFeSi,1.5wt%TiSiC对α-Al和β-Si呈现最佳细化效果,尺寸分别细化了69.3%和38.1%,同时细化了容易在末端产生应力集中的α-AlFeSi。1.5wt.%TiSiC/ZL109复合材料的硬度、屈服强度、抗拉强度提升最为明显,分别为124.6HV、125MPa、214MPa,相较基体分别提升了19%、36%和16%,强化方式主要为细晶强化;80N载荷下1.5wt.%摩擦系数较基体降低了46.2%,磨损失重降低了63.3%,表现出磨损性能最佳。磨损机制主要为磨粒磨损,同时还存在剥层磨损和氧化磨损。T6热处理后,依旧是1.5wt.%TiSiC/ZL109合金组织细化最为显著,其中多角状初生Si和针状共晶Si的形貌发生明显的类球化改变,相较热处理前的基体,Si相尺寸细化了约73.2%,对α-Al也有明显细化,同时α-AlFeSi也发生显著细化。1.5wt.%TiSiC/ZL109合金的的硬度、抗拉强度和屈服强度也呈现最佳,分别为150.57HV、254.4MPa、165.9MPa,相较热处理前的基体来说,分别提升了51.5%、62.2%、54.4%;80N载荷下1.5wt.%摩擦系数较热处理前基体降低了54.1%,磨损失重降低了78.2%,主要磨损机制为磨粒磨损。

关键词： ZL109 Ti3SiC2颗粒晶粒强化 T6热处理磨粒磨损

Interfacial microstructure of 20% SO_2/Al matrix composites reinforced with in situ formation ceramic phases

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中国有色金属学会会刊：英文版 2002年第5期12卷 899-903页

作者：孙继兵李国彬崔春翔安雅琴刘世敏李杰民韩瑞平 School of Materials Science and Engineering Hebei University of Technology Tianjin 300132 China Command Department Institute of Military Traffic Tianjin 300161 China

Al matrix composites reinforced with in situ ceramic phases by adding 20% SiO 2 were fabricated by powder metallurgy process. The interfacial microstructure of the composites was studied by means of SEM and HREM. It was shown that the ceramic phases mainly composed of spinel MgAl 2O 4 are formed in situ in the original SiO 2 particle and the size of small MgAl 2O 4 crystallites is about dozens of nanometers, which can adjacent to Al and Si. MgO could not found in original SiO 2 particle but a little in matrix and may exist with Si, Mg 2Si and Al. Si is mostly distributed in matrix and forms some segregation zones. The size of Mg 2Si is about 50～100 nm and can usually be seen in the matrix.

关键词：晶界显微结构原位复合物复合强化陶瓷相晶粒强化铝混合物 SO2/Al

Effect of different heat treatment process on damping peak of 6061Al/SiC_p MMC produced by spray codeposition

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中国有色金属学会会刊：英文版 2002年第5期12卷 960-965页

作者：顾金海张清霄顾敏王西科王灿朱震刚 Research Center for Materials Zhengzhou University Zhengzhou 450002 China College of Mechanical and Electronic Engineering Zhengzhou University Zhengzhou 450002 China Laboratory of Internal Friction and Defects in Solids Institute of Solid State Physics Hefei 230031 China

Effects of five typical heat treatment processes on the damping properties and the damping peak of 6061Al/SiC p MMC fabricated by spray codeposition were studied. The results show that the internal friction spectra of various heat treated samples exhibit the damping peak versus temperature between 130 ℃ and 200 ℃. Furthermore, the peak temperature as well as the peak height increases with increasing frequencies. By Arrhenius equation the active energy of the damping peak can be gotten, which is above 1 eV. On the other hand, different quenching treatments affect the damping peak remarkably, when the rate of cooling is above that of water quenching, the damping peak will shift to higher temperature as cooling speed is enhanced.

关键词：喷射共沉积热处理衰减能量内耗峰值晶粒强化铝基本复合物 6061Al/SiCp