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EnglishThe effect of surface laser melting on a rare earth rich magnesium alloy (Mg-Nd2.8-Gd1.5-Zr0.5-Zn0.2) was studied. Samples extracted from sand cast plates were surface laser melted (SLM) using 3.3 kW diode laser, then heat treated according to standard T6 conditions. Microstructural characterization on cross-sections of the SLM specimens allowed to identify four different areas: the remelted zone (RZ), mainly composed by fine grained equiaxed microstructure; the transition zone (TZ), consisting of columnar grains; the heat affected zone (HAZ), characterized by the partial dissolution of second phases and eutectic compound; the base material (BM). The T6 heat treatment after LSR induced a substantial grain growth in the RZ, resulting in a decrease of tensile properties in comparison to the T6 heat-treated alloy not subjected to laser remelting, despite substantially similar Brinell hardness values were registered.
| Titolo: | Effect of surface laser melting on microstructure and mechanical properties of the rare earth rich Mg alloy EV31A | |
| Autore/i: | CESCHINI, LORELLA; Angelini, Valerio; MORRI, ALESSANDRO; TARTERINI, FABRIZIO; FORTUNATO, ALESSANDRO; LIVERANI, ERICA | |
| Autore/i Unibo: | ||
| Anno: | 2016 | |
| Rivista: | ||
| Abstract: | The effect of surface laser melting on a rare earth rich magnesium alloy (Mg-Nd2.8-Gd1.5-Zr0.5-Zn0.2) was studied. Samples extracted from sand cast plates were surface laser melted (SLM) using 3.3 kW diode laser, then heat treated according to standard T6 conditions. Microstructural characterization on cross-sections of the SLM specimens allowed to identify four different areas: the remelted zone (RZ), mainly composed by fine grained equiaxed microstructure; the transition zone (TZ), consisting of columnar grains; the heat affected zone (HAZ), characterized by the partial dissolution of second phases and eutectic compound; the base material (BM). The T6 heat treatment after LSR induced a substantial grain growth in the RZ, resulting in a decrease of tensile properties in comparison to the T6 heat-treated alloy not subjected to laser remelting, despite substantially similar Brinell hardness values were registered. | |
| Data stato definitivo: | 2017-02-13T15:01:26Z | |
| Appare nelle tipologie: | 1.01 Articolo in rivista |
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