High-pressure-torsion-induced segregation, precipitation and grain refinement of Al-(Si, Mg and Cu) binary alloys
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in: JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY, Jahrgang 199.2024, Nr. 10 November, 10.11.2024, S. 102-113.
Publikationen: Beitrag in Fachzeitschrift › Artikel › Forschung › (peer-reviewed)
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TY - JOUR
T1 - High-pressure-torsion-induced segregation, precipitation and grain refinement of Al-(Si, Mg and Cu) binary alloys
AU - Feng, Man
AU - Wu, Qinli
AU - Xue, Jing
AU - Luo, Zhenjiao
AU - Wang, Zhiping
AU - An, Xianghai
AU - Liao, Xiaozhou
AU - LI, Jiehua
AU - Jin, Shenbao
AU - Sha, Gang
N1 - Publisher Copyright: © 2024
PY - 2024/11/10
Y1 - 2024/11/10
N2 - To uncover the effects of segregation and precipitation on grain refinement of metals under severe plastic deformation, high-pressure-torsion (HPT) processing is performed on three binary Al-(Si, Mg, and Cu) alloys with different stability and segregation characteristics. Atom probe tomography analysis reveals that HPT processing induces significant decomposition of Al-1 at% Si and Al-1 at% Cu alloys with coarse Si particles and fine Al 2Cu (θ) precipitates formed, but no decomposition of Al-1 at% Mg alloy, with dislocations segregated with Si, Cu, and Mg, and grain boundaries (GBs) only segregated with Cu and Mg. The GB segregation of Cu is stronger than that of Mg and Si, with Cu excess in the range of 1.5–7.0 atoms/nm 2, Mg excess in the range of 0–4.0 atoms/nm 2, but no Si excess. Interestingly, some GBs without Mg segregation develop a Mg-depletion zone along a single side. All evidences demonstrate that GB segregation and precipitation are responsible for HPT-induced grain refinement of Al-1Mg and Al-1Cu alloys but coarsening of the Al-1Si alloy. Engineering solute distribution is of significance in controlling the ultrafine grain of the Al alloys.
AB - To uncover the effects of segregation and precipitation on grain refinement of metals under severe plastic deformation, high-pressure-torsion (HPT) processing is performed on three binary Al-(Si, Mg, and Cu) alloys with different stability and segregation characteristics. Atom probe tomography analysis reveals that HPT processing induces significant decomposition of Al-1 at% Si and Al-1 at% Cu alloys with coarse Si particles and fine Al 2Cu (θ) precipitates formed, but no decomposition of Al-1 at% Mg alloy, with dislocations segregated with Si, Cu, and Mg, and grain boundaries (GBs) only segregated with Cu and Mg. The GB segregation of Cu is stronger than that of Mg and Si, with Cu excess in the range of 1.5–7.0 atoms/nm 2, Mg excess in the range of 0–4.0 atoms/nm 2, but no Si excess. Interestingly, some GBs without Mg segregation develop a Mg-depletion zone along a single side. All evidences demonstrate that GB segregation and precipitation are responsible for HPT-induced grain refinement of Al-1Mg and Al-1Cu alloys but coarsening of the Al-1Si alloy. Engineering solute distribution is of significance in controlling the ultrafine grain of the Al alloys.
KW - Al alloys
KW - Grain refinement
KW - High pressure torsion
KW - Precipitation
KW - Segregation
UR - http://www.scopus.com/inward/record.url?scp=85191657494&partnerID=8YFLogxK
U2 - 10.1016/j.jmst.2024.02.046
DO - 10.1016/j.jmst.2024.02.046
M3 - Article
VL - 199.2024
SP - 102
EP - 113
JO - JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
JF - JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
SN - 1005-0302
IS - 10 November
ER -