Abstract
Laser additive manufacturing is an advanced material preparation technology, which has been widely used to prepare various materials, such as polymers, metals, ceramics and composites. Zirconium diboride (ZrB2) reinforced copper composite material was fabricated using laser direct energy deposition technology. The microstructure and phase composition of the composite material were analyzed, and the influence of laser energy density on the microstructure and mechanical properties of composite materials was discussed. The results showed that the needle-like ZrB2 ceramic reinforcement was successfully synthesized via an in-situ synthesis reaction. The composites were mainly composed of needle-like ZrB2, Ni dendrites and a Cu matrix. The morphological changes of Ni dendrites could be observed at the interface inside the composite material: cellular crystals → large-sized columnar dendrites → small-sized dendrites (along the solidification direction). The continuous Ni dendritic network connected the ZrB2 reinforcements together, which significantly improved the mechanical properties of the composite material. At a laser energy density of 0.20 kJ/mm2, the average microhardness of the composite material reached 294 HV0.2 and the highest tensile strength was 535 MPa. With the laser energy density increased to 0.27 kJ/mm2, the hardness and tensile strength decreased and the elongation of the Cu composites increased due to an increase in the size of the ZrB2 and a decrease in the continuity of the Ni dendritic.
Highlights
Laser additive manufacturing (LAM) is an advanced material preparation technology, which adopts laser as an energy source and powders or wires as raw material to construct a 3D specimen under the control of a computer [1,2]
The laser additive manufacturing of ceramic reinforced metal matrix composites (CMC) has an advantage in that the molten pool environment formed in the laser processing process can provide the basic conditions for the in-situ synthesis of ceramic reinforcements
The microstructure of the composites was mainly a composite structure composed of needle-like ZrB2, Ni dendrites, and a Cu matrix
Summary
Laser additive manufacturing (LAM) is an advanced material preparation technology, which adopts laser as an energy source and powders or wires as raw material to construct a 3D specimen under the control of a computer [1,2]. The laser additive manufacturing of CMCs has an advantage in that the molten pool environment formed in the laser processing process can provide the basic conditions for the in-situ synthesis of ceramic reinforcements. NiCrBSi coating on the surface of 35 CrMo steel substrate, a variety of reinforcement phases (TaC, Ni3 Fe, CrB, M23 C6 and Cr2.8 Fe1.2 B4 ) were synthesized in the molten pool, which significantly improved the high temperature wear resistance of the coating [30]. During the laser sintering of Cu-4.1Zr-1.1B powder, ZrB2 and CuZr were synthesized in the Cu matrix, which improved the high temperature hardness of Cu composites [31]. The exploration goal was to use LDED technology to prepare ZrB2 ceramic whisker reinforced copper matrix composites. The microhardness distribution and tensile properties of the samples prepared under different energy input densities were studied
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