铸造技术2026，Vol.47Issue(2)：128-140,13.DOI:10.16410/j.issn1000-8365.2026.5078
重熔对原位TiB2/Al-20Si复合材料组织和性能的影响
Effect of Remelting on the Microstructure and Properties of In-Situ TiB2/Al-20Si Composites
摘要
Abstract
Particle-reinforced Al-Si composites exhibit excellent mechanical and thermal properties,making them suitable for aerospace and automotive applications.However,in situ synthesized nanoparticle-strengthened Al-Si alloys often face challenges such as particle clustering and the formation of defects such as pores and inclusions during fabrication and processing,which significantly deteriorate material performance.Consequently,methods for improving particle distribution and melt purification are urgently needed.On this basis,the influence of remelting combined with ultrasonic vibration on the microstructure and flexural strength of 2 wt.％TiB2/Al-Si composites was investigated.The results demonstrate that the introduction of high-energy ultrasonic vibration during remelting effectively breaks out particle agglomerations and enhances the uniform distribution of nanoparticles.Additionally,remelting suppresses the coarsening of primary Si,reducing its average size by 18.8％after remelting at 750 ℃ compared with the as-cast state.The flexural strength of the TiB2/Al-20Si composite reaches 304 MPa,representing a 14.6％improvement over that of the nonremelted material.The thermal conductivity of the TiB2/Al-20Si composite reaches 169.4 W/(m-K),representing a 4.8％increase compared with its state before remelting.关键词
重熔/金属基复合材料/过共晶Al-Si合金/颗粒分布/性能Key words
remelting/metal matrix composites/hypereutectic Al-Si alloy/particle distribution/properties分类
矿业与冶金引用本文复制引用
朱俊霖,于家康,王兆阳..重熔对原位TiB2/Al-20Si复合材料组织和性能的影响[J].铸造技术,2026,47(2):128-140,13.基金项目
陕西省自然科学基础研究计划(2021JM-058) （2021JM-058）
