An elevated temperature Mg-Dy-Zn alloy with long period stacking ordered phase by extrusion

作者：Bi, Guangli; Fang, Daqing; Zhao, Lei; Lian, Jianshe; Jiang, Qing; Jiang, Zhonghao^*

来源：Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing, 2011, 528(10-11): 3609-3614.

DOI：10.1016/j.msea.2011.01.065

• Magnesium
• Mg-Dy-Zn alloy
• Microstructure
• Mechanical properties
• Long period stacking ordered phase

A Mg-2Dy-0.5Zn (at.%) alloy was prepared by casting, heat treating at 525 degrees C for 10 h, extruding at 360 degrees C and ageing at 180 degrees C for 90 h. Microstructure characterization revealed that this alloy consists of the fine-grained alpha-Mg matrix composed nearly of the 14H long period stacking ordered (LPSO) phase and a small amount of (Mg, Zn)(x)Dy precipitations. Tensile tests showed that the yield and ultimate tensile strengths of this alloy can reach 245 MPa and 260 MPa at 300 degrees C, which are only slightly lower than those at room temperature (287 MPa and 321 MPa), the elongation of this alloy is 36% at 300 degrees C, which is far higher than that at room temperature (11.6%). The high volume fraction of the 14H LPSO phase in the fine-grained alpha-Mg grains and the high thermal stability of the microstructure during elevated temperature deformation are responsible for the excellent elevated temperature properties observed for this alloy.

• 出版日期2011-4-25
• 单位吉林大学