TY - JOUR
T1 - Effect of gadolinium on the microstructure and mechanical properties of Mg-Nd-Zn-Zr cast magnesium alloys
AU - Li, Jiehua
AU - Jie, Wanqi
AU - Yang, Guangyu
PY - 2008/10
Y1 - 2008/10
N2 - The new element points was selected by adjusting Nd and Zn content based on Mg-Nd-Zn-Zr magnesium alloys, and the effects of Gadolinium on the microstructures and mechanical properties of Mg-Nd-Zn-Zr magnesium alloy were studied. The main research results are as follows: (1) The as-cast microstructure of Mg-Nd-Zn-Zr alloy and NG31 alloy consist of α-Mg grains with Mg12Nd phase on the grain boundary. (2) After solution heat-treatment, Mg12Nd phase of Mg-Nd-Zn-Zr alloy were dissolved in the matrix, however, there was still discontinued Mg12Nd phase at grain boundary of NG31 alloy. (3) The mechanical properties of Mg-Nd-Zn-Zr alloy and NG31 alloy at room temperature are satisfactory, with σb =275 MPa, σ 0.2 =158 MPa for Alloy-A2 and σb=280 MPa, σ0.2 =165 MPa for NG31 alloy respectively. (4) With the increase of Nd and the decrease of Zn, the ultimate strength, yield strength and the elongation of Mg-Nd-Zn-Zr alloy at room temperature were increased slightly. The ultimate strength and yield strength of NG31 alloy are higher than those of Mg-Nd-Zn-Zr alloy at room temperature, but the elongation is lower. (5) With the temperature increasing, the ultimate strength and yield strength of Alloy-A2 at elevated temperature were decreased sharply. The ultimate strength of NG31 alloy kept at 215 MPa at 250 °C, and the yield strength also kept at 155 MPa higher than 141 MPa at 200 °C.
AB - The new element points was selected by adjusting Nd and Zn content based on Mg-Nd-Zn-Zr magnesium alloys, and the effects of Gadolinium on the microstructures and mechanical properties of Mg-Nd-Zn-Zr magnesium alloy were studied. The main research results are as follows: (1) The as-cast microstructure of Mg-Nd-Zn-Zr alloy and NG31 alloy consist of α-Mg grains with Mg12Nd phase on the grain boundary. (2) After solution heat-treatment, Mg12Nd phase of Mg-Nd-Zn-Zr alloy were dissolved in the matrix, however, there was still discontinued Mg12Nd phase at grain boundary of NG31 alloy. (3) The mechanical properties of Mg-Nd-Zn-Zr alloy and NG31 alloy at room temperature are satisfactory, with σb =275 MPa, σ 0.2 =158 MPa for Alloy-A2 and σb=280 MPa, σ0.2 =165 MPa for NG31 alloy respectively. (4) With the increase of Nd and the decrease of Zn, the ultimate strength, yield strength and the elongation of Mg-Nd-Zn-Zr alloy at room temperature were increased slightly. The ultimate strength and yield strength of NG31 alloy are higher than those of Mg-Nd-Zn-Zr alloy at room temperature, but the elongation is lower. (5) With the temperature increasing, the ultimate strength and yield strength of Alloy-A2 at elevated temperature were decreased sharply. The ultimate strength of NG31 alloy kept at 215 MPa at 250 °C, and the yield strength also kept at 155 MPa higher than 141 MPa at 200 °C.
KW - Mechanical properties
KW - Mg-Nd-Zn-Zr cast magnesium alloys
KW - Microstructures
KW - Rare earth Gd
KW - Solution treatment.
UR - http://www.scopus.com/inward/record.url?scp=56149096854&partnerID=8YFLogxK
M3 - 文章
AN - SCOPUS:56149096854
SN - 1002-185X
VL - 37
SP - 1751
EP - 1755
JO - Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering
JF - Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering
IS - 10
ER -