期刊
MATERIALS
卷 15, 期 22, 页码 -出版社
MDPI
DOI: 10.3390/ma15227940
关键词
AlSi10Mg alloy; equal channel angular pressing (ECAP); microstructure; microhardness; yield strength; scanning electron microscopy; electron backscatter diffraction (EBSD)
类别
资金
- National Science Centre, Poland [2021/43/D/ST8/1 946, 319 CZ.02.1.01/0.0/0.0/17_049/8 407]
- Structural Funds of the European Union
In this study, the microstructural evolution and mechanical properties of SLM-produced AlSi10Mg alloy were investigated using post-processing with ECAP. Low-temperature annealing and ECAP treatment resulted in partial breakage of Si networks and nucleation of β-Si precipitates in the Al matrix, leading to improved microhardness and yield strength of the alloy.
With the aim of improving the excellent mechanical properties of the SLM-produced AlSi10Mg alloy, this research focuses on post-processing using ECAP (Equal Channel Angular Pressing). In our article, two different post-processing strategies were investigated: (1) low-temperature annealing (LTA) and subsequent ECAP processing at 150 degrees C; (2) no heat treatment and subsequent ECAP processing at 350 degrees C, 400 degrees C and 450 degrees C. The microstructure and mechanical properties of this alloy were analyzed at each stage of post-treatment. Metallographic observations, combined with SEM and EBSD studies, showed that the alloys produced by SLM have a unique cellular microstructure consisting of Si networks surrounding the Al-based matrix phase. Low-temperature annealing (LTA), followed by ECAP treatment, facilitated the microstructural evolution of the alloy with partial breakup of the Si network and observed nucleation of beta-Si precipitates throughout the Al matrix. This resulted in a Vickers microhardness of 153 HV and a yield strength of 415 MPa. The main results show that post-processing of SLM-produced AlSi10Mg alloys using ECAP significantly affects the microstructural evolution and mechanical properties of the alloy.
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