Heidarzadeh Akbar, Javidani Mousa, Mofarrehi Mohammadreza, Motalleb-Nejad Pouyan, Mohammadzadeh Roghayeh, Jafarian Hamidreza, Chen X-Grant
Department of Materials Engineering, Azarbaijan Shahid Madani University, Tabriz P.O. Box 53714-161, Iran.
Department of Applied Science, University of Quebec at Chicoutimi, Saguenay, QC G7H 2B1, Canada.
Materials (Basel). 2023 Jan 19;16(3):944. doi: 10.3390/ma16030944.
A new strategy is proposed to modify the grain structure and crystallographic texture of laser-powder bed fusion AlSi10Mg alloy using multi-pass friction stir processing (FSP). Accordingly, 1-3 passes of FSP with 100% overlap were performed. Scanning electron microscopy and electron backscattered diffraction were used for microstructural characterization. Continuous dynamic recrystallization and geometric dynamic recrystallization are the governing mechanisms of grain refinement during FSP. The stir zones have bimodal grain structures containing large and fine grains. The multi-pass FSP caused a considerable increase in the volume fraction of the large-grained area in the stir zone, which contained higher values of low-angle boundaries and sharp shear texture components of B(11¯2)[110] and B¯(1¯12¯)[1¯1¯0]. The formation of low-energy grain boundaries in the stir zone and alignment of the low-energy crystallographic planes with the surface of the sample made the strategy of using multi-pass FSP a promising candidate for corrosion resistance enhancement in future studies. Moreover, the detailed evolution of the grains, texture components, grain boundaries, and Si particles is discussed.
提出了一种新策略，通过多道次搅拌摩擦加工（FSP）来改变激光粉末床熔融AlSi10Mg合金的晶粒结构和晶体取向。据此，进行了1-3道次100%重叠率的FSP。采用扫描电子显微镜和电子背散射衍射进行微观结构表征。连续动态再结晶和几何动态再结晶是FSP过程中晶粒细化的主导机制。搅拌区具有包含大晶粒和细晶粒的双峰晶粒结构。多道次FSP导致搅拌区大晶粒区域的体积分数显著增加，该区域包含较高值的低角度晶界以及B(11¯2)[110]和B¯(1¯12¯)[1¯1¯0]的尖锐剪切织构组分。搅拌区低能量晶界的形成以及低能量晶体平面与样品表面的对齐，使得多道次FSP策略成为未来研究中提高耐腐蚀性的有前途的候选方法。此外，还讨论了晶粒、织构组分、晶界和Si颗粒的详细演变过程。
