TY - JOUR
T1 - Synergy of Sn micro-alloying and thermomechanical processing on formability and precipitation behavior of Al-Mg-Si-Cu-Zn alloys
AU - Li, Gaojie
AU - Guo, Mingxing
AU - Du, Jinqing
AU - Zhuang, Linzhong
PY - 2022
Y1 - 2022
N2 - The effect of Sn micro-alloying on microstructure evolution, formability and precipitation behaviour of Al-Mg-Si-Cu-Zn alloys were systematically studied by experimental techniques and theoretical calculations. Results show that Sn addition can accelerate both the precipitation and re-dissolution of the Fe-rich phase during casting and homogenising treatments, which thereby determined the final microstructure. A significant retarding effect to natural ageing precipitation was observed with increasing Sn content in quenching samples, but this effect was weakened in pre-aged samples, as explained by DSC and simulations. The different number densities of the strengthening phase β″at the same artificial aging state are mainly attributed to the changed activation energy of the β″ phase affected by the formed Sn-containing Mg-Zn clusters and Mg-Si clusters. Trace Sn participating in the formation of GP zones, Sn-containing MgZn2 phase and new precipitating sequences during ageing were proposed for the first time.
AB - The effect of Sn micro-alloying on microstructure evolution, formability and precipitation behaviour of Al-Mg-Si-Cu-Zn alloys were systematically studied by experimental techniques and theoretical calculations. Results show that Sn addition can accelerate both the precipitation and re-dissolution of the Fe-rich phase during casting and homogenising treatments, which thereby determined the final microstructure. A significant retarding effect to natural ageing precipitation was observed with increasing Sn content in quenching samples, but this effect was weakened in pre-aged samples, as explained by DSC and simulations. The different number densities of the strengthening phase β″at the same artificial aging state are mainly attributed to the changed activation energy of the β″ phase affected by the formed Sn-containing Mg-Zn clusters and Mg-Si clusters. Trace Sn participating in the formation of GP zones, Sn-containing MgZn2 phase and new precipitating sequences during ageing were proposed for the first time.
KW - Al-Mg-Si-Cu-Zn alloys
KW - GP zones
KW - precipitation kinetics
KW - Sn micro-alloying
UR - http://www.scopus.com/inward/record.url?scp=85145079151&partnerID=8YFLogxK
U2 - 10.1080/14786435.2022.2154401
DO - 10.1080/14786435.2022.2154401
M3 - Article
AN - SCOPUS:85145079151
SN - 1478-6435
VL - 103 (2023)
SP - 435
EP - 464
JO - Philosophical Magazine
JF - Philosophical Magazine
IS - 5
ER -