原位合成 TiC 粒子对富铁共晶铝硅合金微观结构和力学性能的协同效应

IF 3.7 3区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Materials Today Communications Pub Date : 2024-09-03 DOI:10.1016/j.mtcomm.2024.110257
Qiufeng Jiang, Peng Tang, Hao Jiang
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引用次数: 0

摘要

再生铝硅合金中长针状富铁金属间化合物相的存在严重影响了合金的机械性能。原位形成的陶瓷颗粒可作为增强相,在保持热力学稳定性的同时优化材料的性能。本研究利用搅拌铸造工艺原位制备方法生产 TiC/Al-Si-Fe 复合材料,研究原位 TiC 颗粒对 Al-12Si-1.7Fe 铸造合金机械性能和微观结构演变的影响。根据化学反应热力学原理评估了 TiC 形成的可能性。结果表明,Ti 和 C 的添加完善了微观结构,并使相分布更加均匀。一些富含铁的相从长针状结构转变为鱼骨状结构,有效缓解了应力集中。此外,少量 AlTi 相的形成与坚硬的 TiC 增强颗粒相结合,大大降低了平均摩擦系数,从 0.91 降至 0.6,使磨损模式从复杂模式转变为以磨料磨损为主。然而,未完全反应的碳颗粒和偏析的(Al,Si)Ti 相的存在对基体的脆性破坏敏感性产生了负面影响。这种原位陶瓷颗粒制备方法为研究再生富铁铝硅合金的耐磨性、相变和强化机制提供了宝贵的指导。
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Synergistic effect of in-situ TiC particles synthesis on microstructure and mechanical properties of Fe-rich eutectic Al-Si alloy
The presence of long acicular Fe-rich intermetallic compound phases in recycled Al-Si alloys significantly affects the mechanical properties of the alloy. In-situ formed ceramic particles, serving as reinforcing phases, can optimize the material's performance while maintaining thermodynamic stability. This study utilized the in-situ preparation method via a stir casting process to produce TiC/Al-Si-Fe composite materials, investigating the impact of in-situ TiC particles on the mechanical properties and microstructural evolution of the Al-12Si-1.7Fe cast alloy. The potential for TiC formation was assessed based on the principles of chemical reaction thermodynamics. The results indicate that the addition of Ti and C refined the microstructure and led to a more uniform phase distribution. Some Fe-rich phases transformed from long acicular structures to fishbone-like structures, effectively alleviating stress concentration. Furthermore, the formation of a small amount of AlTi phase, in conjunction with the hard TiC reinforcing particles, significantly reduced the average coefficient of friction from 0.91 to 0.6, shifting the wear mode from a complex pattern to one dominated by abrasive wear. However, the presence of incompletely reacted carbon particles and the segregated (Al,Si)Ti phase negatively impacted the susceptibility to brittle failure of the matrix. This in-situ ceramic particle preparation method provides valuable guidance for the study of wear resistance, phase transformation, and strengthening mechanisms in recycled Fe-rich Al-Si alloys.
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来源期刊
Materials Today Communications
Materials Today Communications Materials Science-General Materials Science
CiteScore
5.20
自引率
5.30%
发文量
1783
审稿时长
51 days
期刊介绍: Materials Today Communications is a primary research journal covering all areas of materials science. The journal offers the materials community an innovative, efficient and flexible route for the publication of original research which has not found the right home on first submission.
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