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Microstructure Twinning and Mechanical Properties of Laser Melted Cu-10Sn Alloy for High Strength and Plasticity

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Abstract

A dense Cu-10Sn alloy bulk specimen was obtained by optimizing the laser powder bed fusion (L-PBF) processing, and the relative density of the specimen reached 99.7%. The grain morphology was mainly the columnar dendrite and inter-dendritic phases generated along the solidification direction. Tensile testing and detailed microstructural characterization were carried out on specimens in the as-built and heat-treated condition. Under the quasi-static tensile condition, the yield strength (σ0.2), ultimate tensile strength (UTS), and the elongation of the as-built Cu-10Sn specimen were 392 MPa, 749 MPa and 29%, respectively. After the solution treatment at 800 °C for 4 h, and aging treatment at 400 °C for 2 hours, the microstructure of the specimen transformed from the columnar grain to equiaxed grain, the dislocation density decrease, and numerous annealing twins were observed in the heat-treated state. Therefore, the quasi-static tensile yield strength (σ0.2) of the specimen was reduced to 245 MPa. However, the UTS and the elongation were increased to 840 MPa and 56%, respectively, due to the interaction between annealing twins and equiaxed grain.

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Acknowledgment

The authors would like to thank the financial support for this work from the General Program of Science and Technology Development Project of Beijing Municipal Education Commission (KM202010005006).

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Authors and Affiliations

  1. Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing, 100124, People’s Republic of China

    Peng Yang, Xingye Guo, Dingyong He, Wei Shao, Zhen Tan, Hanguang Fu, Zhenlu Zhou & Xiaoya Zhang

  2. Beijing Engineering Research Center of Eco-materials and LCA, Beijing, 100124, People’s Republic of China

    Dingyong He

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  1. Peng Yang
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Yang, P., Guo, X., He, D. et al. Microstructure Twinning and Mechanical Properties of Laser Melted Cu-10Sn Alloy for High Strength and Plasticity. J. of Materi Eng and Perform 31, 2624–2632 (2022). https://doi.org/10.1007/s11665-021-06409-5

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