Multimodal analysis of spatially heterogeneous microstructural refinement and softening mechanisms in three-pass friction stir processed Al-4Si alloy
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In: Journal of Alloys and Compounds, Vol. 887, 161351, 20.12.2021.
Research output: Journal contributions › Journal articles › Research › peer-review
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TY - JOUR
T1 - Multimodal analysis of spatially heterogeneous microstructural refinement and softening mechanisms in three-pass friction stir processed Al-4Si alloy
AU - Escobar, Julian
AU - Gwalani, Bharat
AU - Olszta, Matthew
AU - Silverstein, Joshua
AU - Overman, Nicole
AU - Bergmann, Luciano
AU - dos Santos, Jorge F.
AU - Staron, Peter
AU - Maawad, Emad
AU - Klusemann, Benjamin
AU - Mathaudhu, Suveen
AU - Devaraj, Arun
PY - 2021/12/20
Y1 - 2021/12/20
N2 - Solid phase processing methods such as friction stir processing (FSP) offer pathways to refine the microstructure of metallic alloys through the combined action of deformation and deformation-induced heating. However, this thermomechanical coupling during FSP also leads to the occurrence of multiple competing microstructural evolution mechanisms which in turn can lead to locally varying mechanical properties, often distributed heterogeneously in the microstructure. This inherent microstructural and mechanical property heterogeneity in alloys subjected to FSP makes it rather challenging to reveal the microstructure-mechanical property relationships systematically. Therefore in this work, we systematically analyze the relationship between microstructural evolution and local microhardness in a model binary Al-4 at.% Si alloy subjected to three-pass friction stir processing. Spatially resolved high-energy synchrotron X-ray diffraction, electron backscattered diffraction, and scanning transmission electron microscopy were used to understand the heterogeneous microstructural evolution due to the FSP. Our results provide insight into how particle-stimulated grain nucleation, recovery, and recrystallization occur heterogeneously in the Al-Si alloy as a function of the distance from the stir zone, directly influencing the degree of softening. The systematic understanding developed by this work can guide future studies on the influence of FSP process parameters on the microstructural evolution mechanisms and its influence on local mechanical properties
AB - Solid phase processing methods such as friction stir processing (FSP) offer pathways to refine the microstructure of metallic alloys through the combined action of deformation and deformation-induced heating. However, this thermomechanical coupling during FSP also leads to the occurrence of multiple competing microstructural evolution mechanisms which in turn can lead to locally varying mechanical properties, often distributed heterogeneously in the microstructure. This inherent microstructural and mechanical property heterogeneity in alloys subjected to FSP makes it rather challenging to reveal the microstructure-mechanical property relationships systematically. Therefore in this work, we systematically analyze the relationship between microstructural evolution and local microhardness in a model binary Al-4 at.% Si alloy subjected to three-pass friction stir processing. Spatially resolved high-energy synchrotron X-ray diffraction, electron backscattered diffraction, and scanning transmission electron microscopy were used to understand the heterogeneous microstructural evolution due to the FSP. Our results provide insight into how particle-stimulated grain nucleation, recovery, and recrystallization occur heterogeneously in the Al-Si alloy as a function of the distance from the stir zone, directly influencing the degree of softening. The systematic understanding developed by this work can guide future studies on the influence of FSP process parameters on the microstructural evolution mechanisms and its influence on local mechanical properties
KW - Al-4Si
KW - Friction stir processing
KW - Geometric dynamic recrystallization
KW - Grain fragmentation
KW - Synchrotron X-ray diffraction
KW - Engineering
UR - http://www.scopus.com/inward/record.url?scp=85112441413&partnerID=8YFLogxK
UR - https://www.mendeley.com/catalogue/42befdae-6028-38a2-a0b4-5664ea903101/
U2 - 10.1016/j.jallcom.2021.161351
DO - 10.1016/j.jallcom.2021.161351
M3 - Journal articles
AN - SCOPUS:85112441413
VL - 887
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
SN - 0925-8388
M1 - 161351
ER -