TY - GEN
T1 - Microstructure and mechanical properties of Mg-7.71Gd-2.39Nd-0.17Zr alloy after the different heat treatments
AU - Luo, Shifeng
AU - Yang, Guangyu
AU - Xiao, Lei
AU - Jie, Wanqi
N1 - Publisher Copyright:
© The Minerals, Metals & Materials Society 2018.
PY - 2018
Y1 - 2018
N2 - Microstructure and mechanical properties of Mg-7.71Gd-2.39Nd-0.17Zr alloy after different heat treatments were investigated. The microstructure of the as-cast alloy was composed of α-Mg matrix, bone-shaped α-Mg + β-Mg5(Gd, Nd) eutectic, a little amount of small cuboid phase (GdH2) and Zr-rich cluster within α-Mg matrix. The optimal solution treatment was determined to be at 515 °C for 4 h. After solution treatment, bone-shaped α-Mg + β-Mg5(Gd, Nd) eutectic was almost dissolved into α-Mg matrix and the grain size increased slightly. Furthermore, a large amount of GdH2was precipitated along the grain boundaries and within α-Mg matrix. After subsequent aging treatment at 200 °C for 32 h, Mg5Gd phases were precipitated along the grain boundaries. For the peak-aged alloy, the peak hardness of 105 HV was achieved and the ultimate tensile strength, yield strength and elongation at room temperature were up to 273.7, 188.2 MPa and 4.1%, respectively, which may be mainly attributed to the β″ and β′ phase precipitated within α-Mg matrix after ageing treatment.
AB - Microstructure and mechanical properties of Mg-7.71Gd-2.39Nd-0.17Zr alloy after different heat treatments were investigated. The microstructure of the as-cast alloy was composed of α-Mg matrix, bone-shaped α-Mg + β-Mg5(Gd, Nd) eutectic, a little amount of small cuboid phase (GdH2) and Zr-rich cluster within α-Mg matrix. The optimal solution treatment was determined to be at 515 °C for 4 h. After solution treatment, bone-shaped α-Mg + β-Mg5(Gd, Nd) eutectic was almost dissolved into α-Mg matrix and the grain size increased slightly. Furthermore, a large amount of GdH2was precipitated along the grain boundaries and within α-Mg matrix. After subsequent aging treatment at 200 °C for 32 h, Mg5Gd phases were precipitated along the grain boundaries. For the peak-aged alloy, the peak hardness of 105 HV was achieved and the ultimate tensile strength, yield strength and elongation at room temperature were up to 273.7, 188.2 MPa and 4.1%, respectively, which may be mainly attributed to the β″ and β′ phase precipitated within α-Mg matrix after ageing treatment.
KW - Ageing-hardening
KW - Mechanical properties
KW - Mg–Gd–Nd–Zr alloy
KW - Microstructure
KW - Solution treatments
UR - http://www.scopus.com/inward/record.url?scp=85042408615&partnerID=8YFLogxK
U2 - 10.1007/978-3-319-72332-7_37
DO - 10.1007/978-3-319-72332-7_37
M3 - 会议稿件
AN - SCOPUS:85042408615
SN - 9783319723310
T3 - Minerals, Metals and Materials Series
SP - 237
EP - 243
BT - Magnesium Technology 2018
A2 - Solanki, Kiran N.
A2 - Joshi, Vineet
A2 - Neelameggham, Neale R.
A2 - Orlov, Dmytro
PB - Springer International Publishing
T2 - International Symposium on Magnesium Technology, 2018
Y2 - 11 March 2018 through 15 March 2018
ER -