Effects of nano-TiC p on the microstructures and tensile properties of TiC p /Al-Cu composites
Effects of nano-TiC p on the microstructures and tensile properties of TiC p /Al-Cu composites
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DOI：
10.1016/j.matchar.2014.05.012
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发表时间：
2014-08
期刊：
影响因子：
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通讯作者：
Dongshuai Zhou;Jian Tang;F. Qiu;Jin Wang;Q. Jiang
中科院分区：
文献类型：
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作者：
Dongshuai Zhou;Jian Tang;F. Qiu;Jin Wang;Q. Jiang
大量的实验和理论研究表明，减小增强颗粒的尺寸可以显著提高复合材料的力学性能。然而，将纳米颗粒添加到常规金属材料中的研究还很少，尤其是将纳米TiC颗粒添加到Al-Cu合金中的研究还很少。本研究采用铸造法成功制备了镍包覆纳米TiC增强Al-Cu基复合材料。结果表明，纳米TiCp存在于α-Al颗粒中。α-Al枝晶更细小、更发达。Al-Cu基合金中的θ析出物细小、分布均匀。复合材料的拉伸强度和延伸率同时提高。经T6热处理后，0.8%纳米TiCp/Al-Cu复合材料的抗拉强度和延伸率分别由485%和6.6%提高到573%和12.4%，与未增强Al-Cu合金相比，纳米TiCp/Al-Cu复合材料的抗拉强度和延伸率分别提高到573%和12.4%。
Many experimental and theoretical studies indicated that the decrease of the size of the reinforcing particles can lead to substantial improvements in the mechanical performance of the composites. However, the investigations on the addition of the nano particles into conventional metal materials are still rare, especially the nano-TiCpinto the Al–Cu alloys. In this study, the Ni coated nano-TiCpreinforced Al–Cu matrix composites were successfully fabricated by a casting route. It was found that the nano-TiCpwas in the α-Al grains. The α-Al dendrites became finer and more developed. Moreover, the θ′ precipitates in the Al–Cu matrix were finer and uniformly distributed. The tensile strength and elongation of the composites increased simultaneously. After T6 heat treatment, compared with the unreinforced Al–Cu alloy, the tensile strength and elongation of the 0.8 wt.% nano-sized TiCp/Al–Cu composite increased from 485 MPa and 6.6% to 573 MPa and 12.4%, respectively.