铸造技术2025，Vol.46Issue(9)：888-895,8.DOI:10.16410/j.issn1000-8365.2025.5148
Sc对Al-Si-Cu-Ni-Mg合金组织与热暴露的影响研究
Effect of Sc on the Microstructure and Thermal Exposure of Al-Si-Cu-Ni-Mg Alloys
摘要
Abstract
Cast heat-resistant Al-Si-Cu-Ni-Mg alloys serve as crucial foundational materials for fabricating heat-resistant,lightweight components,such as pistons,which are used in high-power-density engines.A key strategy to increase the temperature resistance of these alloys involves incorporating Sc elements that possess high melting points and low thermal diffusion coefficients to regulate the phase structure and morphology of the alloys.Therefore,the effects of the addition and content of Sc on the microstructure and evolution of the AlCuNi phase of heat-resistant Al-Si-Cu-Ni-Mg piston alloys were investigated.The results reveals that with increasing Sc content,a new AlSiCuNiSc phase forms in the piston alloy,and the number and size of the AlSiCuNiSc phases increases with increasing Sc content.In addition,with the formation of the AlSiCuNiSc phase,the 8-Al3CuNi phase undergoes a transformation from a typical eutectic lamellar to a rod-like structure.During thermal exposure,the Cu and Ni atoms in the 8-Al3CuNi phase diffuse into the α-Al matrix,and a nanoscaleγ-Al7Cu4Ni phase is formed at the phase interface of 8-Al3CuNi.However,the morphology and composition of the AlSiCuNiSc phase almost did not change before and after heat exposure,indicating extremely high thermal stability.The presence of atoms such as Si and Sc with high melting points and low thermal diffusivity in the AlSiCuNiSc phase greatly improves its thermal stability.关键词
耐热铝合金/微观组织/Sc元素/热暴露Key words
heat-resistant Al alloy/microstructure/Sc element/thermal exposure分类
矿业与冶金引用本文复制引用
董浩,马凯迪,李金峰,夏峰,梁艳峰,郭永春..Sc对Al-Si-Cu-Ni-Mg合金组织与热暴露的影响研究[J].铸造技术,2025,46(9):888-895,8.基金项目
陕西省自然科学基础研究计划(2025JC-YBMS-371) （2025JC-YBMS-371）
陕西省教育厅青年创新团队项目(23JP063) （23JP063）
