TY - GEN
T1 - Study on directional solidification microstructures of Mg-Zn-Gd ternary magnesium alloy
AU - Yang, Guangyu
AU - Liu, Shaojun
AU - Jie, Wanqi
AU - Zhang, Jun
AU - Yu, Zhong
PY - 2013
Y1 - 2013
N2 - Mg-5.5Zn-2.0Gd ternary magnesium alloy was solidified under a constant temperature gradient (G=40K/mm) at different growth rates (v=6-35μm/s) using a directional solidification (DS) technique, and the directional solidification microstructures were studied. It was confirmed experimentally that the directional solidified alloys were mainly consisted of α(Mg) matrix and α(Mg)+W(Mg3Zn3Gd2) binary eutectic and α(Mg)+I(Mg3Zn6Gd) ternary eutectic at all of the three growth rates (v=6μm/s, 20μm/s and 35μm/s), which just fell inside the limit of computational thermodynamics solidification path calculated using the Scheil model. α(Mg) primary arm spacing (λ1) and its secondary arm spacing (λ2) could be expressed as a functions of the growth rate (v) in the form, λ1=k1v -a (k1=1×10-5, a=0.225) and λ2=k2v-b (k2=111.89, 6=0.369) separately, and the growth velocity indexes (a=0.225 and b=0.369) were very close to the values (a=1/4, b=1/3) predicted by the Hunt-model and the Kurz-Fisher model.
AB - Mg-5.5Zn-2.0Gd ternary magnesium alloy was solidified under a constant temperature gradient (G=40K/mm) at different growth rates (v=6-35μm/s) using a directional solidification (DS) technique, and the directional solidification microstructures were studied. It was confirmed experimentally that the directional solidified alloys were mainly consisted of α(Mg) matrix and α(Mg)+W(Mg3Zn3Gd2) binary eutectic and α(Mg)+I(Mg3Zn6Gd) ternary eutectic at all of the three growth rates (v=6μm/s, 20μm/s and 35μm/s), which just fell inside the limit of computational thermodynamics solidification path calculated using the Scheil model. α(Mg) primary arm spacing (λ1) and its secondary arm spacing (λ2) could be expressed as a functions of the growth rate (v) in the form, λ1=k1v -a (k1=1×10-5, a=0.225) and λ2=k2v-b (k2=111.89, 6=0.369) separately, and the growth velocity indexes (a=0.225 and b=0.369) were very close to the values (a=1/4, b=1/3) predicted by the Hunt-model and the Kurz-Fisher model.
KW - Dendrite growth
KW - Directional solidification
KW - Mg-Zn-Gd ternary magnesium alloy
KW - Microstructure
KW - Solidification path
UR - http://www.scopus.com/inward/record.url?scp=84903948987&partnerID=8YFLogxK
M3 - 会议稿件
AN - SCOPUS:84903948987
SN - 9781632660008
T3 - 8th Pacific Rim International Congress on Advanced Materials and Processing 2013, PRICM 8
SP - 2659
EP - 2667
BT - 8th Pacific Rim International Congress on Advanced Materials and Processing 2013, PRICM 8
PB - John Wiley and Sons Inc.
T2 - 8th Pacific Rim International Congress on Advanced Materials and Processing 2013, PRICM 8
Y2 - 4 August 2013 through 9 August 2013
ER -