Cerri Emanuela, Ghio Emanuele
Department of Engineering and Architecture, University of Parma, Via G. Usberti, 181/A, 43124 Parma, Italy.
Materials (Basel). 2022 Sep 3;15(17):6126. doi: 10.3390/ma15176126.
The artificial aging heat treatments performed directly on as-built and solubilized AlSi7Mg0.6 and AlSi10Mg0.3 samples were characterized and discussed. The analysed bars and billets (height of 300 mm) were manufactured via the Laser Powder-Bed Fusion process on a build platform heated at 150 °C. Therefore, its influence on the as-built samples was studied in terms of mechanical performance variations between the bottom and top regions. Vickers microhardness measurements were performed to obtain aging profiles after direct aging (175-225 °C) and T6 heat treatments and to highlight better time and temperature parameters to optimize the mechanical properties of both alloys. SEM observations were used to characterize the microstructure before and after the heat treatments and its influence on the fracture mechanisms. Generally, the direct aging heat treatments show the same effects on both aluminium alloys, unlike the solubilization at 505 °C followed by artificial aging at 175 °C. The strengths vs. elongation values obtained after the direct aging treatments are better than those exhibited by T6 as highlighted by the quality index.
对直接在增材制造态及固溶处理后的AlSi7Mg0.6和AlSi10Mg0.3样品上进行的人工时效热处理进行了表征和讨论。所分析的棒材和坯料（高度为300 mm）是通过激光粉末床熔融工艺在150°C加热的成型平台上制造的。因此，从底部和顶部区域之间的力学性能变化方面研究了其对增材制造态样品的影响。进行维氏显微硬度测量以获得直接时效（175 - 225°C）和T6热处理后的时效曲线，并突出更好的时间和温度参数以优化两种合金的力学性能。利用扫描电子显微镜观察来表征热处理前后的微观结构及其对断裂机制的影响。一般来说，直接时效热处理对两种铝合金显示出相同的效果，这与在505°C固溶后于175°C进行人工时效不同。如质量指标所突出显示的，直接时效处理后获得的强度与伸长率值优于T6处理后的表现。
