中國有色金屬學(xué)報(bào)(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 20 Special 2 July 2010 |
（1. State Key Laboratory for Corrosion and Protection, Institute of Metal Research,
Chinese Academy of Sciences, Shenyang 110016, China;
2. Luoyang Ship Material Research Institute, Luoyang 471039, China;
3. High Temperature Creep Laboratory, Institute of Metal Research, Chinese Academy of Sciences,
Shenyang 110016, China）
Abstract:Tensile creep behaviors of the ageing hardened Mg-10Gd-3Y alloy (referred to GW103) were investigated at temperatures up to 300 ℃. The extruded-T5 specimen exhibited high creep resistance, i.e. the low steady-state creep rate and long creep rupture time, while the better creep properties were observed in the cast-T6 one. The low steady-state creep rate of 1.71×10−9 s−1 is obtained at 200 ℃ and 80 MPa for the extruded-T5 GW103 alloy. In addition, the microstructure development of GW103-T5 alloy was also examined after creep exposure at different temperatures. On the other hand, the stress exponent and activation energy were studied in the temperature range of 200−300 ℃ for the extruded-T5 specimens, and the creep mechanism was also discussed.
Key words: creep; Mg-10Gd-3Y alloy; microstructure; crack
