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首页> 外文期刊>Materials Science and Engineering >Microstructural formation and characterization mechanisms of selective laser melted Al-Si-Mg alloys with increasing magnesium content
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Microstructural formation and characterization mechanisms of selective laser melted Al-Si-Mg alloys with increasing magnesium content

机译：镁含量增加的选择性激光熔炼Al-Si-Mg合金的组织形成和表征机理

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摘要

We elucidated the microstructural formation and characterization mechanisms of Al-4Si-Mg selective laser melted (SLM) specimens with increasing Mg content (similar to 2.5 mass%). First, the effect of Mg content on the processability of Al-4Si-Mg SLM specimens was systematically studied. From Al-4Si to Al-4Si-2.0Mg alloys, densified SLM specimens with a relative density of more than 99.5% were achieved by optimizing scan conditions. The relative density of the Al-4Si-2.5Mg SLM specimen decreased to approximately 99.4% due to the generation of gas pores by Mg evaporation. Then, the relation between the metal structures and mechanical properties and thermal conductivity of the Al-4Si-Mg SLM specimens was investigated. The tensile strength and 0.2% proof stress of the Al-4Si-Mg SLM specimens significantly increased with the Mg content. A multiscale metal structural analysis of the Al-4Si-Mg SLM specimens revealed that this strengthening was ascribed to multiple factors: both the crystal grain refinement and increase of solid-solute Mg in the alpha-Al matrix obstructed the dislocation movement. On the other hand, the elongation decreased in a stepwise manner with increasing Mg content. The SEM observations of the fracture surfaces in the Al-4Si-Mg tensile SLM specimens indicated that the decrease in elongation was attributed to the gas pores generated by Mg evaporation and shrinkage cavities. The thermal conductivity decreased slightly as the solid-solute Mg in the a-Al increased. These results can provide profound knowledge for the design of novel Al SLM alloys.
机译：我们阐明了Al-4Si-Mg选择性激光熔融（SLM）样品中Mg含量增加（约2.5质量％）的显微组织形成和表征机理。首先，系统地研究了镁含量对Al-4Si-Mg SLM试样加工性能的影响。从Al-4Si到Al-4Si-2.0Mg合金，通过优化扫描条件，获得了相对密度超过99.5％的致密SLM标本。 Al-4Si-2.5Mg SLM样品的相对密度下降到大约99.4％，这是由于Mg蒸发产生了气孔。然后，研究了Al-4Si-Mg SLM试样的金属组织，力学性能和导热系数之间的关系。 Al-4Si-Mg SLM试样的拉伸强度和0.2％屈服强度随Mg含量的增加而显着增加。 Al-4Si-Mg SLM样品的多尺度金属结构分析表明，这种强化归因于多种因素：α-Al基体中晶粒细化和固溶Mg的增加均阻碍位错运动。另一方面，伸长率随着Mg含量的增加而逐步降低。 SEM对Al-4Si-Mg拉伸SLM试样的断裂表面的观察表明，伸长率的降低归因于Mg蒸发和收缩腔产生的气孔。随着a-Al中固溶Mg的增加，热导率略有下降。这些结果可为新型Al SLM合金的设计提供深刻的知识。

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