期刊
INTERNATIONAL JOURNAL OF PLASTICITY
卷 138, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijplas.2021.102926
关键词
Additive manufacturing; Selective laser melting; Cu-15Ni-8Sn alloy; Deformation behavior; Mechanical properties; Premature failure
资金
- European Regional Developmen Fund [ASTRA6-6]
- CSC scholarship from China
A comprehensive understanding of the deformation behavior and strengthening mechanism of the selective laser melted (SLM) alloy is crucial for maximizing the potential of the SLM process. This study focuses on the impact of SLM on the microstructure, deformation behavior, and mechanical properties of Cu-Ni-Sn alloy compared to their cast counterparts (CC). The SLM microstructure, characterized by increased dislocation density, offers a superior combination of tensile strength and ductility, mainly attributed to grain refinement, dispersed precipitation, and increased dislocation density.
A comprehensive understanding of the deformation behavior and strengthening mechanism of the selective laser melted (SLM) alloy is critical in reaping the complete potential of the SLM process. Accordingly, this work focuses on the influence of SLM on the microstructure, deformation behavior, and mechanical properties of the Cu-Ni-Sn alloy compared with their cast (CC) counterparts. An equiaxed-columnar bimodal structure with dispersed gamma particles was observed due to the rapid solidification conditions, which helps in eliminating the otherwise formed brittle dendrite structure. The unique SLM microstructure with increased dislocation density offers a superior combination of tensile strength and ductility that is much higher than the CC samples. The SLM microstructure involving dislocation cells and fine precipitations led to a relatively high strain rate sensitivity (0.012 +/- 0.002) and a small activation volume (similar to 115 b(3)). It has been observed that in the as-prepared SLM material the strength contribution comes mainly from grain refinement, dispersed precipitation, and increased dislocation density.
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