Microstructural evolution and age-hardening behavior of quasicrystal-reinforced Mg-Dy-Zn alloy

作者：Bi, Guang-Li^*; Han, Yu-Xiang; Jiang, Jing; Jiang, Chun-Hong; Li, Yuan-Dong; Ma, Ying

来源：Rare Metals, 2019, 38(8): 739-745.

DOI：10.1007/s12598-018-1089-8

• Mg-Dy-Zn alloy
• Microstructure
• I phase
• Age-hardening behavior

Microstructural evolution and age-hardening behavior of Mg-2Dy-6Zn (at%) alloy during solid-solution and aging treatment were investigated. The microstructure of as-cast alloy is composed of -Mg, Mg3DyZn6 (I) phase, Mg3Dy2Zn3 (W) phase, Mg(Zn,Dy) phase and a small amount of Mg0.97Zn0.03 phases. After solid-solution treatment (480 degrees C, 12h), all the I phases and most W phases dissolve into -Mg matrix and the remainder W phases transform into Mg(Dy,Zn) phase and MgDy3 phase. During aging treatment, I phase and small amounts of W phases co-precipitate from -Mg matrix, respectively. The alloy exhibits a peak hardness of HV 77.5 at 200 degrees C for 8h. The excellent age-hardening behavior of alloy is mainly attributed to the co-precipitation strengthening of I and W phases.

• 出版日期2019-8
• 单位兰州理工大学