Du Andong, Lattanzi Lucia, Jarfors Anders E W, Zhou Jie, Zheng Jinchuan, Wang Kaikun, Yu Gegang
Department of Materials Processing and Control Engineering, School of Materials Science and Engineering, University of Science and Technology Beijing, Xueyuan Road 30, Haidian District, Beijing 100083, China.
Institute of Semi-Solid Metal Technology, China Academy of Machinery Sciences and Technology (Jiangle), Huancheng East Road 22, Jiangle County, Sanming 353300, China.
Materials (Basel). 2022 May 26;15(11):3789. doi: 10.3390/ma15113789.
Road transport and the associated fuel consumption plays a primary role in emissions. Weight reduction is critical to reaching the targeted reduction of 34% in 2025. Weight reduction in moving parts, such as pistons and brake disc rotors, provide a high-impact route to achieve this goal. The current study aims to investigate the formability of Al-Si alloys reinforced with different fractions and different sizes of SiCp to create an efficient and lightweight Al-MMC brake disk. Lanthanum (La) and cerium (Ce) were added to strengthen the aluminium matrix alloy and to improve the capability of the Al-MMC brake discs to withstand elevated temperature conditions, such as more extended braking periods. La and Ce formed intermetallic phases that further strengthened the composite. The analysis showed the processability and thermal stability of the different material's combinations: increased particle sizes and broader size range mixture supported the formation of the SiCp particle interactions, acting as an internal scaffolding. In conclusion, the additions of Ce and La strengthened the softer matrix regions and resulted in a doubled compression peak strength of the material without affecting the formability, as demonstrated by the processing maps.
道路运输及相关的燃料消耗在排放中起着主要作用。减轻重量对于在2025年实现34%的目标减排至关重要。减轻诸如活塞和制动盘转子等运动部件的重量，是实现这一目标的一条具有重大影响的途径。当前的研究旨在探究用不同比例和不同尺寸的SiCp增强的Al-Si合金的可成形性，以制造一种高效且轻质的铝基复合材料制动盘。添加镧（La）和铈（Ce）以强化铝基合金，并提高铝基复合材料制动盘承受高温条件的能力，比如更长时间的制动周期。La和Ce形成金属间相，进一步强化了复合材料。分析表明了不同材料组合的加工性能和热稳定性：增大的颗粒尺寸和更宽尺寸范围的混合物支持了SiCp颗粒相互作用的形成，起到内部支架的作用。总之，Ce和La的添加强化了较软的基体区域，并且如加工图所示，在不影响可成形性的情况下使材料的压缩峰值强度提高了一倍。
