Journal
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
Volume 96, Issue 9-12, Pages 4223-4230Publisher
SPRINGER LONDON LTD
DOI: 10.1007/s00170-018-1891-3
Keywords
Selective laser melting; Cu-15Ni-8Sn; Sn segregation; gamma-precipitates
Funding
- National Key R&D Program of China [2017YFB0305800]
- National Natural Science Foundation of China [51602350]
- China Postdoctoral Science Foundation [2017M610505]
- Key Research and Development Program of Hunan province, China [2016JC2003]
- State Key Laboratory of Powder Metallurgy, Central South University
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In this work, Cu-15Ni-8Sn components were manufactured by selective laser melting (SLM) with a near full density of about 99.4%. The microstructures and phase precipitation of the as-fabricated Cu-15Ni-8Sn alloy were characterized by X-ray diffraction (XRD), electron probe microanalyzer (EPMA), electron back-scattered diffraction (EBSD), and transmission electron microscope (TEM). It was demonstrated that the as-fabricated Cu-15Ni-8Sn alloy shows alpha-phase with gamma-precipitates by XRD and TEM. The size of the grains of alpha-phase is in the range of 5 similar to 20 mu m with random orientation distribution. The gamma-precipitate is a Sn- and Ni-rich phase distributed dispersedly in matrix and accumulatively in grain boundary. The as-fabricated Cu-15Ni-8Sn alloy exhibited yield strength of 522 MPa, ultimate tensile strength of 653 MPa, and elongation of 17%. The excellent mechanical performance of the as-fabricated Cu-15Ni-8Sn alloy is caused by the local laser melting mode including rapid cooling rate and reduplicative fusing from the subsequent layer melting, which leads to refined grains and limited Sn segregation in micron-size within the matrix.
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