Effect ofIn Situ 2%TiB2 Particles on Microstructure and Mechanical Properties of 2024Al Additive Manufacturing Alloy
Received date: 2022-08-25
Revised date: 2022-10-17
Online published: 2022-10-31
Supported by
National Natural Science Foundation of China(52075327);National Natural Science Foundation of China(52004160);Shanghai Sailing Program(20YF1419200);Natural Science Foundation of Shanghai(20ZR1427500);Major Science and Technology Project of Huaibei(Z2020001);Shanghai Synchrotron Radiation Facility (SSRF) Beamline BL13W1(2020-SSRF-PT-012107)
Laser powder bed fusion (L-PBF) is an innovative additive manufacturing method with great potential for fabricating complex geometrical components with integrated functionalities. In the aerospace industry, the Al-Cu-Mg (2024Al) alloy is widely used because of its excellent mechanical properties and low density; however, its disadvantages include low printability and high crack susceptibility. This work investigates the effects of in situ TiB2 particles on the microstructure and tensile properties of the solution-treated (510oC treat 1 h and then cooling by water) and T6-treated (i.e., solution and aging treatments) L-PBF fabricated 2024Al alloy at room temperature. Equiaxed grains with an average size of approximately 5.8 μm dominate in the printed 2024Al-2%TiB2 alloy because of the high cooling rate during the L-PBF process and the heterogeneous nucleation effect of the TiB2 particles. After the T6 heat treatment, many uniformly distributed, fine, and long precipitation strips formed in both the 2024Al and 2024Al-2%TiB2 alloys. The 2024Al-2%TiB2 alloy has ultimate tensile and yield strengths of (458.2 ± 6.5) and (398.4 ± 2.7) MPa, respectively; further, it has a maximum elongation of (3.4 ± 0.4)%. These parameters indicate a substantial improvement in the strength and elongation of the 2024Al-2%TiB2 alloy compared to those of the 2024Al alloy. Furthermore, the mechanical properties of the T6-treated 2024Al-2%TiB2 alloy are comparable to those of the wrought T6-treated 2024Al-T6 alloy. The main strengthening mechanisms of the 2024Al-2%TiB2 alloy include solid solution strengthening, dislocation strengthening, grain boundary strengthening, precipitation strengthening, Orowan strengthening, and load-bearing strengthening induced by TiB2 particles. In conclusion, 2024Al-2%TiB2 alloy manufactured using the L-PBF method provides excellent printability and room-temperature tensile properties.
Tengteng SUN , Hongze WANG , Yi WU , Mingliang WANG , Haowei WANG . Effect ofIn Situ 2%TiB2 Particles on Microstructure and Mechanical Properties of 2024Al Additive Manufacturing Alloy[J]. Acta Metall Sin, 2023 , 59(1) : 169 -179 . DOI: 10.11900/0412.1961.2022.00410
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