Effect of Ce addition on the microstructure and mechanical properties of extruded Mg-Sn-Al-Zn alloy

详细信息    查看全文

• 作者：Sang-Hoon Kim^a ; ^b ; Jae-Gil Jung^a ; Bong Sun You^a ; ^b ; Sung Hyuk Park^c ; ^{sh.park@knu.ac.kr" class="auth_mail" title="E-mail the corresponding author} ; ^{shparkknu@gmail.com" class="auth_mail" title="E-mail the corresponding author}
• 关键词：TAZ711 ; Cerium ; Extrusion ; Dynamic recrystallization ; Tensile properties
• 刊名：Materials Science & Engineering A
• 出版年：2016
• 出版时间：7 March 2016
• 年：2016
• 卷：657
• 期：Complete
• 页码：406-412
• 全文大小：4851 K

文摘

The effect of Ce addition on the microstructural characteristics and tensile properties of an extruded Mg-7Sn-1Al-1Zn (TAZ711) alloy was investigated, through which it was found that a Ce₃Sn₅ phase forms along the grain boundaries and within grains; the volume fraction of this phase also increased with Ce content. All of the extruded alloys exhibited a partially recrystallized structure, but the area fraction of dynamically recrystallized (DRXed) grains increased with Ce addition as a result of DRX behavior being enhanced by particle-stimulated nucleation at the Ce₃Sn₅ particles. With an increase in Ce content, however, the number of Mg₂Sn precipitates decreased due to a decrease in the Sn content within the matrix, which in turn increased the size of the DRXed grains through a weakening of the boundary-pinning effect. The tensile strength gradually decreased with increasing Ce content, which was mainly attributed to a decrease in the number of precipitates and an increased DRXed grain size. Furthermore, the elongation of the alloy was increased by a decrease in the fraction of coarse unDRXed grains in which micro-cracking can be easily initiated.