Processing-microstructure-properties relationship of high entropy alloys fabricated by 3-dimensional printing
Selective Electron Beam Melting (SEBM) of an equiatomic, pre-alloyed and gas atomized CoCrFeMnNi high-entropy alloy (HEA) powder was studied, with the focus put on the process window, resulting microstructure and mechanical properties. The printed samples achieved a relative density up to 98% and ma...
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| Format: | Final Year Project |
| Language: | English |
| Published: |
2018
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| Online Access: | http://hdl.handle.net/10356/74777 |
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| Institution: | Nanyang Technological University |
| Language: | English |
| Summary: | Selective Electron Beam Melting (SEBM) of an equiatomic, pre-alloyed and gas atomized CoCrFeMnNi high-entropy alloy (HEA) powder was studied, with the focus put on the process window, resulting microstructure and mechanical properties. The printed samples achieved a relative density up to 98% and mainly consist of FCC phase. Columnar microstructure was observed alone the build direction and cellular sub-microstructure was observed at the cross-section. The mechanical properties characterization results showed that this HEA exhibits excellent ductility with fracture strain up to 72% along build direction. Moreover, anisotropic tensile properties were observed, this could be contributed by the long columnar grains. Thus, in the transverse direction, a sharp drop of elongation occurred. |
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