Snopiński Przemysław, Woźniak Anna, Pagáč Marek
Department of Materials Engineering and Biomaterials, Faculty of Mechanical Engineering, Silesian University of Technology, Konarskiego 18A Street, 44-100 Gliwice, Poland.
Materials Research Laboratory, Silesian University of Technology, Konarskiego 18A Street, 44-100 Gliwice, Poland.
Materials (Basel). 2021 Dec 10;14(24):7598. doi: 10.3390/ma14247598.
The AlSi10Mg alloy is characterized by a high strength-to-weight ratio, good formability, and satisfying corrosion resistance; thus, it is very often used in automotive and aerospace applications. However, the main limitation of using this alloy is its low yield strength and ductility. The equal-channel angular pressing is a processing tool that allows one to obtain ultrafine-grained or nanomaterials, with exceptional mechanical and physical properties. The purpose of the paper was to analyze the influence of the ECAP process on the structure and hardness of the AlSi10Mg alloy, obtained by the selective laser melting process. Four types of samples were examined: as-fabricated, heat-treated, and subjected to one and two ECAP passes. The microstructure analysis was performed using light and electron microscope systems (scanning electron microscope and transmission electron microscope). To evaluate the effect of ECAP on the mechanical properties, hardness measurements were performed. We found that the samples that underwent the ECAP process were characterized by a higher hardness than the heat-treated sample. It was also found that the ECAP processing promoted the formation of structures with semicircular patterns and multiple melt pool boundaries with a mean grain size of 0.24 μm.
AlSi10Mg合金具有高强度重量比、良好的可加工性和令人满意的耐腐蚀性；因此，它经常用于汽车和航空航天应用。然而，使用这种合金的主要限制是其低屈服强度和延展性。等通道转角挤压是一种加工工具，可用于获得具有优异机械和物理性能的超细晶粒或纳米材料。本文的目的是分析等通道转角挤压工艺对通过选择性激光熔化工艺获得的AlSi10Mg合金的组织和硬度的影响。研究了四种类型的样品：铸态、热处理态以及经过一次和两次等通道转角挤压道次的样品。使用光学和电子显微镜系统（扫描电子显微镜和透射电子显微镜）进行微观结构分析。为了评估等通道转角挤压对力学性能的影响，进行了硬度测量。我们发现，经过等通道转角挤压工艺的样品比热处理样品具有更高的硬度。还发现，等通道转角挤压工艺促进了具有半圆形图案和多个熔池边界的组织的形成，平均晶粒尺寸为0.24μm。
