Aging characteristics and high temperature properties of Mg-9Gd-3Y-0.3Zr

作者：Yao Su juan^*; Yi Dan qing; Yang Sheng; Li Wang xing

来源：Transactions of Nonferrous Metals Society of China, 2007, 17: S418-S422.

• magnesium alloy
• rare earth
• aging treatment
• tensile property

The microstructures and tensile properties of Mg-9Gd-3Y-0.3Zr alloys were investigated by OM, SEM and mechanical property tester. The results show that the microstructure of as-cast sample is a typical dendritic structure, the grain size of extruded sample is finer than that of the as-cast because of recrystallization. The aging response of extruded specimens is quick and marked when the samples are aged at 200 to 250 degrees C for different time, and the peak aging hardness is about HV120. The tensile strengths at 25, 200, 250 and 300 degrees C are 375, 364, 329 and 286 MPa, respectively. The maximum elongation is higher than 18% at 300 degrees C. The fracture mode is mainly microvoid coalescence fracture combining with brittle cleavage fracture at room temperature, and microvoid coalescence fracture at 250-300 degrees C.

• 出版日期2007-11
• 单位中南大学