Bilbao Yoana, Trujillo Juan José, Vicario Iban, Arruebarrena Gurutze, Hurtado Iñaki, Guraya Teresa
Department of Mining and Metallurgical Engineering and Materials Science, Faculty of Engineering of Bilbao, University of the Basque Country (UPV/EHU), 48013 Bilbao, Spain.
Mechanical and Manufacturing Department, Faculty of Engineering, Mondragon Unibertsitatea, 20500 Arrasate/Mondragon, Spain.
Materials (Basel). 2022 Jul 20;15(14):5056. doi: 10.3390/ma15145056.
Newly designed multicomponent light alloys are giving rise to non-conventional microstructures that need to be thoroughly studied before determining their potential applications. In this study, the novel AlZnSiMg alloy, previously studied with CALPHAD methods, was cast and heat-treated under several conditions. An analysis of the phase evolution was carried out with in situ X-ray diffraction supported by differential scanning calorimetry and electron microscopy. A total of eight phases were identified in the alloy in the temperature range from 30 to 380 °C: α-Al, α'-Al, Zn, Si, MgSi, MgZn, MgZn, and SrZn. Several thermal transitions below 360 °C were determined, and the natural precipitation of the Zn phase was confirmed after nine months. The study showed that the thermal history can strongly affect the presence of the MgZn and MgZn phases. The combination of X-ray thermo-diffraction with CALPHAD methods, differential scanning calorimetry, and electron microscopy offered us a satisfactory understanding of the alloy behavior at different temperatures.
新设计的多组分轻合金正产生一些非常规微观结构，在确定其潜在应用之前需要对这些结构进行深入研究。在本研究中，之前用CALPHAD方法研究过的新型AlZnSiMg合金在几种条件下进行了铸造和热处理。利用原位X射线衍射，并辅以差示扫描量热法和电子显微镜，对相演变进行了分析。在30至380°C的温度范围内，合金中共鉴定出八个相：α-Al、α'-Al、Zn、Si、MgSi、MgZn、MgZn和SrZn。确定了低于360°C的几次热转变，并证实九个月后Zn相自然析出。研究表明，热历史会强烈影响MgZn和MgZn相的存在。X射线热衍射与CALPHAD方法、差示扫描量热法和电子显微镜相结合，使我们对合金在不同温度下的行为有了令人满意的了解。
