By using cold metal transfer technique, Cu-Al alloy with addition of silicon (Si) and magnesium (Mg), viz (1) Cu-6.5% Al and (2) Cu-6.5% Al-1.2% Si-0.5% Mg were manufactured additively. Four samples were deposited: Cu-6.5% Al alloy as samples 1 and 2, and Cu-6.5% Al-1.2% Si-0.5% Mg alloy as samples 3 and 4. The alloys were homogenized by heat treatments: (1) 800°C (2 h) for sample 2 and (2) sample 4, to improve their mechanical properties. Detailed microstructural investigation conducted using scanning and transmission electron microscopies showed formation of various intermetallic phases. Results revealed that (1) the addition of Si and Mg increases the strength properties and ductility and (2) heat treatments improved strength properties but reduce the ductility of the alloys. The article discusses the correlation of the identified microstructure and the evaluated mechanical properties of the additively manufactured alloys.

中文翻译：

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硅和镁对增材制造铜铝合金力学性能的影响

通过使用冷金属转移技术，添加硅 (Si) 和镁 (Mg) 的 Cu-Al 合金，即(1) Cu-6.5% Al 和 (2) Cu-6.5% Al-1.2% Si-0.5% Mg 是增材制造的。沉积了四个样品：Cu-6.5% Al 合金作为样品 1 和 2，Cu-6.5% Al-1.2% Si-0.5% Mg 合金作为样品 3 和 4。合金通过热处理均匀化：(1) 800样品 2 和 (2) 样品 4 的 °C（2 小时），以提高其机械性能。使用扫描和透射电子显微镜进行的详细微观结构研究表明形成了各种金属间相。结果表明：(1) 添加 Si 和 Mg 提高了强度性能和延展性，(2) 热处理提高了强度性能但降低了合金的延展性。本文讨论了已识别的微观结构与增材制造合金的评估机械性能之间的相关性。