TY - JOUR
T1 - Ag segregation and interfacial characterization of the hexagonal β(Mg2Si)-phase in Al-Mg-Si-Ag alloy
AU - Ahmed, Abrar
AU - Uttarasak, Kanokwan
AU - Tsuchiya, Taiki
AU - Lee, Seungwon
AU - Nishimura, Katsuhiko
AU - Nunomura, Norio
AU - Ikeno, Susumu
AU - Malik, Ayesha
AU - Shimizu, Kazuyuki
AU - Hirayama, Kyosuke
AU - Toda, Hiroyuki
AU - Yamaguchi, Masatake
AU - Tsuru, Tomohito
AU - Nakamura, Junya
AU - Matsuda, Kenji
N1 - Publisher Copyright:
© 2025 The Authors
PY - 2025/2
Y1 - 2025/2
N2 - This study investigates the interface characteristics of the hexagonal β(Mg₂Si)-phase in Al-Mg-Si-Ag alloys, providing novel insights into its orientation relationship, interfacial conditions, misfit, and Ag segregation with the Al matrix. Using optical microscopy (OM), focused ion beam (FIB), and scanning transmission electron microscopy (STEM), we clarified the role of three distinct facets {111}Al // {111}hex.β, {122}Al // {110}hex.β, and {112}Al // {111}hex.β in determining the stability and properties of the hexagonal β(Mg₂Si)-phase. Unlike the conventional β(Mg₂Si)-phase with a {100}Al habit plane, the hexagonal β-phase was found on the {111}Al habit plane, exhibiting a new orientation relationship [{111}Al // {111}hex.β, < 110>Al // < 110>hex.β]. Ag segregation was notably observed at the interfaces of these facets, with varying concentrations influencing interfacial coherency and strain. These findings not only advance our understanding of microstructural evolution in Al-Mg-Si alloys but also provide a foundation for tailoring material properties through interface engineering. The results offer critical insights for optimizing alloy compositions and heat treatments to enhance mechanical properties and performance in practical applications.
AB - This study investigates the interface characteristics of the hexagonal β(Mg₂Si)-phase in Al-Mg-Si-Ag alloys, providing novel insights into its orientation relationship, interfacial conditions, misfit, and Ag segregation with the Al matrix. Using optical microscopy (OM), focused ion beam (FIB), and scanning transmission electron microscopy (STEM), we clarified the role of three distinct facets {111}Al // {111}hex.β, {122}Al // {110}hex.β, and {112}Al // {111}hex.β in determining the stability and properties of the hexagonal β(Mg₂Si)-phase. Unlike the conventional β(Mg₂Si)-phase with a {100}Al habit plane, the hexagonal β-phase was found on the {111}Al habit plane, exhibiting a new orientation relationship [{111}Al // {111}hex.β, < 110>Al // < 110>hex.β]. Ag segregation was notably observed at the interfaces of these facets, with varying concentrations influencing interfacial coherency and strain. These findings not only advance our understanding of microstructural evolution in Al-Mg-Si alloys but also provide a foundation for tailoring material properties through interface engineering. The results offer critical insights for optimizing alloy compositions and heat treatments to enhance mechanical properties and performance in practical applications.
KW - Aluminum
KW - Beta phase
KW - Focused ion beam (FIB)
KW - MgSi
KW - Optical microscope (OM)
KW - Precipitation
KW - Scanning transmission electron microscopy (STEM)
UR - http://www.scopus.com/inward/record.url?scp=85217222160&partnerID=8YFLogxK
U2 - 10.1016/j.mtcomm.2025.111835
DO - 10.1016/j.mtcomm.2025.111835
M3 - 学術論文
AN - SCOPUS:85217222160
SN - 2352-4928
VL - 43
JO - Materials Today Communications
JF - Materials Today Communications
M1 - 111835
ER -