Papantoniou Ioannis G, Markopoulos Angelos P, Manolakos Dimitrios E
Laboratory of Manufacturing Technology, School of Mechanical Engineering, National Technical University of Athens, Heroon Polytechniou 9, 15780 Athens, Greece.
Materials (Basel). 2020 Mar 12;13(6):1278. doi: 10.3390/ma13061278.
In the current study, a new approach for surface modification and surface hardening of aluminum alloys is developed. The method is based on the logic of in-situ reinforcing FSP strategies. The novelty of the proposed process is the application of a bulk reinforcing metallic material instead of metallic powders. The FSP was carried out on aluminum alloy AA5083-thick plates. A thin sheet of pure copper (cross-section 4 × 0.8 mm) was placed in a machined groove on the upper surface of the aluminum plate, and both materials were FSPed together. Samples with one, two and three FSP passes were manufactured respectively. Results indicate that the copper thin sheet was successfully integrated in the AA5083 stir zone. By increasing the FSP passes, almost all copper was integrated in the stir zone, mainly in the form of coper-based micron-sized intermetallic particles, and secondly, by copper diffusion in the AA5083 matrix. Due to the presence of complex intermetallic compounds created by the high heat input and intense plastic deformation, the hardness inside the stir-zone was found highly increased from 77 to 138 HV.
在当前的研究中，开发了一种铝合金表面改性和表面硬化的新方法。该方法基于原位增强摩擦搅拌加工（FSP）策略的逻辑。所提出工艺的新颖之处在于使用块状增强金属材料而非金属粉末。摩擦搅拌加工在AA5083厚铝板上进行。将一片纯铜薄片（横截面为4×0.8毫米）放置在铝板上表面加工好的凹槽中，两种材料一起进行摩擦搅拌加工。分别制造了经过一次、两次和三次摩擦搅拌加工道次的样品。结果表明，铜薄片成功地融入了AA5083搅拌区。通过增加摩擦搅拌加工道次，几乎所有的铜都融入了搅拌区，主要是以铜基微米级金属间化合物颗粒的形式，其次是通过铜在AA5083基体中的扩散。由于高热输入和强烈塑性变形产生了复杂的金属间化合物，搅拌区内的硬度从77 HV大幅提高到138 HV。
