Diamond reinforced aluminum matrix composites by laser powder bed fusion

GAO Wenzhe; HAN Xiao; WEI Haibin; LU Zhengzhen; ZHANG Li; LI Xiaofeng

doi:10.19591/j.cnki.cn11-1974/tf.2024030002

Volume 42 Issue 2

Apr. 2024

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Article Navigation > Powder Metallurgy Technology > 2024 > 42(2): 122-127

GAO Wenzhe, HAN Xiao, WEI Haibin, LU Zhengzhen, ZHANG Li, LI Xiaofeng. Diamond reinforced aluminum matrix composites by laser powder bed fusion[J]. Powder Metallurgy Technology, 2024, 42(2): 122-127. doi: 10.19591/j.cnki.cn11-1974/tf.2024030002

Citation:

GAO Wenzhe, HAN Xiao, WEI Haibin, LU Zhengzhen, ZHANG Li, LI Xiaofeng. Diamond reinforced aluminum matrix composites by laser powder bed fusion[J]. Powder Metallurgy Technology, 2024, 42(2): 122-127. doi: 10.19591/j.cnki.cn11-1974/tf.2024030002

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Diamond reinforced aluminum matrix composites by laser powder bed fusion

doi: 10.19591/j.cnki.cn11-1974/tf.2024030002

1.
School of Materials Science and Engineering, North University of China, Taiyuan 030051, China
2.
School of Mechanical Engineering, North University of China, Taiyuan 030051, China
3.
State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China

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Corresponding author: E-mail: lxf@nuc.edu.cn
Received Date: 2024-03-05
Publish Date: 2024-04-28

Abstract

Abstract

6061 aluminum matrix composites added by 3% diamond particles (mass fraction) were prepared by laser powder bed fusion (LPBF). The microstructure, relative density, and tensile properties of the 3%diamond/6061 aluminum matrix composites were characterized and analyzed by optical microscope, scanning electron microscope, X-ray diffractometer, electronic densitometer, and electronic universal testing machine. Results show that the diamond reacts with the Al matrix, generating the needle-like Al₄C₃ phase, which deposits in the α-Al matrix. Those formed Al₄C₃ increases dislocations at the grain boundaries, enhances the materials’ strength, and delays the failure to fracture. The addition of diamond facilitates the elimination of thermal cracks, but the porous defects remain in 6061 aluminum alloys. The lower scanning speed extends the contact duration between the laser spot and the processed material, leading to the graphitization of the added diamond and the partial evaporation of the Al matrix. Thus, the internal defects exist, exhibiting the low densification of the composite (relative density 97%). The addition of diamond significantly increases the tensile strength of the LPBF formed diamond/6061 aluminum matrix composites, and the ultimate tensile strength reaches the maximum value of 244.2 MPa, the yield strength is 211.6 MPa, and the elongation is 2.1%, respectively, when the laser power is 350 W and the scanning speed is 800 mm·s⁻¹.
- laser powder bed fusion,
- diamond particles,
- aluminum matrix composites,
- process optimization,
- mechanical properties

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References(16)

References

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