Grain refinement in laser remelted Mg-3Nd-1Gd-0.5Zr alloy
| Autor: | Matthew S. Dargusch, Duyao Zhang, Su-Ming Zhu, David H. StJohn, Dong Qiu, Mark Alan Easton |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
010302 applied physics
Equiaxed crystals Materials science Morphology (linguistics) Mechanical Engineering Alloy Metallurgy Metals and Alloys 02 engineering and technology engineering.material 021001 nanoscience & nanotechnology Condensed Matter Physics Laser 01 natural sciences law.invention Temperature gradient Growth restriction Mechanics of Materials law 0103 physical sciences engineering General Materials Science Magnesium alloy 0210 nano-technology Supercooling |
| Zdroj: | Scripta Materialia. 183:12-16 |
| ISSN: | 1359-6462 |
| Popis: | Columnar grains are normally favoured with the high cooling rate and steep thermal gradient in laser-based additive manufacturing. Here, we demonstrate that fine, fully equiaxed grains can be achieved in Mg-3Nd-1Gd-0.5Zr (EV31) alloy by laser surface remelting. The grains in the melt pool are remarkably refined from 74 µm to 3.5 µm, which can be attributed to the growth restriction effect, i.e. the constitutional supercooling formed by Zr solute during solidification in combination with the high cooling rate imposed by laser surface remelting. This novel finding could be applied for the control of grain morphology and alloy design for additive manufacturing applications. |
| Databáze: | OpenAIRE |
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