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SiC 颗粒对 LPBF 成形 TiB2/AlSi10Mg 复合材料 冶金质量与性能的影响
Effect of SiC Particles on the Metallurgical Quality and Properties of TiB2/AlSi10Mg Composites Fabricated by Laser Powder Bed Fusion
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- DOI:
- 作者:
- 耿龙 1，2，吴凡 1，2，彭艺杰 1，2，党铭吉 1，2，范伟 1，2，谭 华 1，2，张凤英 1
GENG Long1,2,WU Fan1,2,PENG Yijie1,2,DANG Mingji1,2,FAN Wei1,2,TAN Hua1,2, ZHANG Fengying1,3,LIN Xin
- 作者单位:
- 1. 西北工业大学 凝固技术全国重点实验室，陕西西安 710072；2. 西北工业大学 金属高性能增材制造与创新设计工业 和信息化部重点实验室，陕西西安 710072；3. 长安大学 材料科学与工程学院，陕西西安 710064
1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072,China; 2. MIIT Key Laboratory of Metal High Performance Additive Manufacturing and Innovative Design, Northwestern Polytechnical University, Xi'an 710072,China; 3. School of Materials Science and Engineering, Chang'an University, Xi'an 710064,China
- 关键词:
- 激光粉末床熔融；SiC 颗粒尺寸与含量；致密度；冶金缺陷；力学性能
laser powder bed fusion; SiC particle size and content; relative density; metallurgical defect; mechanical property
- 摘要:
- SiC 颗粒 尺 寸 与 含 量对 激光 粉末 床 熔 融 制 备 的 颗粒 增强 铝 基 复 合 材 料 的 冶 金质 量 和 力 学 性能 有 重 要影 响 。 本研 究 以 TiB2/AlSi10Mg 预 合金 粉末 为基 体 ，通过 机 械 混 合引 入 不 同粒 径 和 体 积 分数(5 μm-5%、5 μm-10%和20 μm-10%）的 SiC 颗粒。 结果表明，SiC 含量或尺寸的增加降低了致密化，缩小了工艺窗口。 试样的最高致密度分别为99.1%、98.2%和 96.9%。 过量的 SiC 或较大的 SiC 颗粒容易引起气孔、开裂和团聚缺陷，恶化成形质量。 5%(体积分数)SiC试样的显微硬度和杨氏模量分别为 170 HV 和 113.8 GPa， 而 10%(体积分数)SiC 试样分别提高至 200 HV 和 130.6 GPa。适度的 SiC 含量和尺寸有利于实现高致密化和优异的力学性能。The size and content of SiC particles play crucial roles in determining the metallurgical quality and mechanical properties of particle-reinforced aluminum matrix composites (PAMCs) fabricated via laser powder bed fusion (LPBF). TiB2/AlSi10Mg prealloyed powder was used as the matrix, and SiC particles with different sizes and volume fractions(5 μm-5 vol.%, 5 μm-10 vol.%, and 20 μm-10 vol.%) were incorporated through mechanical mixing. The effects of the SiC particle size and content on the densification behavior, process window, metallurgical defects, and mechanical properties were systematically investigated. The results show that increasing the SiC content or particle size reduces densification and narrows the processing window. The maximum relative densities of the 5 μm-5 vol.%, 5 μm-10 vol.%, and 20 μm-10 vol.% samples are 99.1%, 98.2%, and 96.9%, respectively. Excessive addition or larger SiC particles tend to induce porosity, cracking, and agglomeration defects, deteriorating the forming quality. The 5 vol.% SiC sample exhibits a microhardness of 170 HV and a Young's modulus of 113.8 GPa, whereas those of the 10 vol.% SiC sample increase to 200 HV and 130.6 GPa, respectively. A moderate SiC content combined with smaller particle size is beneficial for achieving high densification and superior mechanical properties.