具有高强度和高刚度的碳化硅颗粒增强预合金化 TiB2/AlSi10Mg 复合材料的激光粉末床熔融技术

IF 6.7 2区 材料科学 Q1 ENGINEERING, INDUSTRIAL Journal of Materials Processing Technology Pub Date : 2024-10-11 DOI:10.1016/j.jmatprotec.2024.118635
Long Geng , Fan Wu , Mingji Dang , Zhe Feng , Yijie Peng , Chennuo Kang , Wei Fan , Yongxia Wang , Hua Tan , Fengying Zhang , Xin Lin
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引用次数: 0

摘要

近年来,具有高强度和高刚度的激光粉末床熔融(LPBF)颗粒增强铝基复合材料(PAMC)在航空航天领域引起了广泛关注。然而,使用传统机械混合方法提高单层或双层 PAMC 的性能仍然有限。因此,本研究创新性地采用预合金化∼6.5 wt% TiB2/AlSi10Mg 复合材料作为基体,通过 LPBF 机械混合不同含量(5 vol% 和 10 vol%)的 SiC 颗粒,制备出高颗粒含量的双 PAMC。结果表明,5vol% SiC+TiB2/AlSi10Mg 复合材料的 SiC 颗粒团聚效应相对较弱,相对密度最高(∼99.1 %),因此具有最佳的加工性能。以这种成分的材料为研究对象,发现其微观结构保持了预合金化 TiB2/AlSi10Mg 复合材料的基本特征,只是有轻微的晶粒粗化。然而,SiC 颗粒会与α-Al 基体和 Al3Ti 发生反应。然后形成了 Al4C3 和 TiC 增强相,微米大小的 Si 颗粒析出在被共晶 Al-Si 包围的 Al 单元内。更重要的是,由于采用了新颖的双 PAMCs 粉末制备方法,极限拉伸强度(∼554.0 MPa)、屈服强度(∼376.0 MPa)和弹性模量(∼97.4 GPa)得到了同步提高。总颗粒含量(∼14.0 wt%)和拉伸性能均高于 LPBF 加工的其他 PAMC。最后,除了预合金化 TiB2/AlSi10Mg 复合材料固有的断裂特性外,SiC 颗粒的撕裂还表现出了新的断裂机制。这项研究为利用 LPBF 制备高强度和高刚度 PAMC 提供了新的思路。
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Laser powder bed fusion of SiC particle-reinforced pre-alloyed TiB2/AlSi10Mg composite with high-strength and high-stiffness
Recently, laser powder bed fusion (LPBF) of particle-reinforced aluminum matrix composites (PAMCs) with high-strength and high-stiffness have attracted extensive attention in aviation and aerospace. However, performance improvement of single or dual PAMCs using traditional mechanical mixing method is still limited. Therefore, this study innovatively employed pre-alloyed ∼6.5 wt% TiB2/AlSi10Mg composite as the matrix and mechanically mixed SiC particles with different contents (5 vol% and 10 vol%) to fabricate dual PAMCs with high particles content through LPBF. The results indicated that the 5 vol% SiC+TiB2/AlSi10Mg composite revealed relatively weak agglomeration effect of SiC particle and highest relative density (∼99.1 %), thus exhibiting optimal processability. Using this composition material as the research object, it was found that the microstructure maintains the basic features of pre-alloyed TiB2/AlSi10Mg composite except for the slight grain coarsening. However, SiC particles react with α-Al matrix and Al3Ti. Then Al4C3 and TiC enhancement phase were formed, and micron-sized Si particles precipitated within the Al cells surrounded by the eutectic Al-Si. More importantly, due to novel preparation method of dual PAMCs powder, simultaneous enhancement in ultimate tensile strength (∼554.0 MPa), yield strength (∼376.0 MPa), and elastic modulus (∼97.4 GPa) was achieved. Total particle content (∼14.0 wt%) and tensile property were higher than those of reported other PAMCs processed by LPBF. Finally, expect for the fracture characteristics inherent to the pre-alloyed TiB2/AlSi10Mg composite, new fracture mechanism for the tearing of SiC particles was exhibited. This work provides new insights into the preparation of high-strength and high-stiffness PAMCs processed by LPBF.
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来源期刊
Journal of Materials Processing Technology
Journal of Materials Processing Technology 工程技术-材料科学:综合
CiteScore
12.60
自引率
4.80%
发文量
403
审稿时长
29 days
期刊介绍: The Journal of Materials Processing Technology covers the processing techniques used in manufacturing components from metals and other materials. The journal aims to publish full research papers of original, significant and rigorous work and so to contribute to increased production efficiency and improved component performance. Areas of interest to the journal include: • Casting, forming and machining • Additive processing and joining technologies • The evolution of material properties under the specific conditions met in manufacturing processes • Surface engineering when it relates specifically to a manufacturing process • Design and behavior of equipment and tools.
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