材料科学
扫描电子显微镜
复合材料
极限抗拉强度
微观结构
衍射仪
压痕硬度
脆性
激光功率缩放
弹性模量
透射电子显微镜
材料的强化机理
复合数
激光器
纳米技术
物理
光学
作者
Kai Miao,Hang Zhou,Yunpeng Gao,Xin Deng,Kai Miao,Dichen Li
标识
DOI:10.1016/j.msea.2021.141874
摘要
Laser powder-bed-fusion (L-PBF) was utilized to fabricate Si3N4 reinforced AlSi10Mg composites in this study. The Response Surface Methodology (RSM) was employed to optimize L-PBF processing parameters. The effects of the addition of Si3N4 on the mechanical properties of the L-PBFed Si3N4/AlSi10Mg composites were studied. The microstructures and phase of as-built Si3N4/AlSi10Mg composites were characterized by scanning electron microscope (SEM), transmission electron microscope (TEM) and X-ray diffractometer (XRD). The results showed that 10 vol% Si3N4/AlSi10Mg composites exhibited excellent tensile strength, yield strength, elastic modulus, and microhardness, which reached 485 ± 12 MPa, 362 ± 18 MPa, 103 ± 11 GPa, and 153±3HV, respectively, when the optimal L-PBF process parameters were applied (laser power of 193 W, scan speed of 559 mm/s, hatching space of 0.048 mm). The enhancement effect stemmed from the dislocation strengthening and load transfer mechanism brought about by Si3N4 particles. In L-PBF: the heat conduction of the molten pool was hindered by Si3N4 particles, leading to a reduction of the coarse molten pool. Simultaneously, whilst the mutual diffusion of Al and Si elements occurred, no new brittle phases formed, which improved the bonding strength between the Al matrix and the Si3N4 particles.
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