Microstructures and mechanical properties of aluminum matrix composites reinforced with hybrid TiB2 and SiC prepared by selective laser melting [激光选区熔化成形TiB2与SiC颗粒混杂增强铝基复合材料的显微组织与力学性能]

作者：Shen J.; Liu Y.^*; Ouyang S.; Hong X.; Liu X.

来源：Materials Science and Engineering of Powder Metallurgy, 2020, 25(3): 251-259.

• Hybrid particles reinforced aluminum matrix composites
• Mechanical properties
• Microstructures
• SLM

The (TiB2+SiC)/AlSi10Mg composite powders, with 2% nano-TiB2 particles and 1% submicron-SiC particles were prepared by low-energy ball milling and used for selective laser melting (SLM) process. The microstructures and mechanical properties of aluminum matrix composites (AMCs) reinforced with hybrid TiB2 and SiC and AlSi10Mg alloy were studied by XRD, EBSD and SEM. The results show that the laser reflectivity of the composite powders reduces from 46% to 31% compared to that of AlSi10Mg alloy powders. AMCs reinforced with TiB2 and SiC, with excellent properties, were successfully prepared by SLM at a low laser power of 240 W. Nano-TiB2 particles and submicron-SiC particles are uniformly distributed inside the grains, but a few nano-TiB2 particle sagglomerate and growup tomicron-scale. With the addition of nano-TiB2 particles and submicron-SiC particles, the coarse columnar grains are transformed into equiaxed grains and the average grain size decreases from 7.88 μm to 2.48 μm. The tensile strength, ductility increase to 509.8 MPa, 10.6%, respectively. ? 2020, Editorial Office of Materials Science and Engineering of Powder Metallurgy. All right reserved.

• 单位
  华南理工大学