Microstructure and tensile creep resistance of Mg-5.5%Zn-(0.7%, 1.5%, 3.5%, 7.5%)Y alloys

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• 作者：Gang Chen 陈刚 ; Yan-bin Zhang 张艳政/a> ; Wei-jun Xia 夏伟儿/a>…
• 刊名：Journal of Central South University
• 出版年：2015
• 出版时间：November 2015
• 年：2015
• 卷：22
• 期：11
• 页码：4112-4122
• 全文大小：2,406 KB
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• 作者单位：Gang Chen 陈刚 (1)
  Yan-bin Zhang 张艳斌 (1)
  Wei-jun Xia 夏伟军 (1)
  Ding Chen 陈鼎 (1)
  
  1. College of Materials Science and Engineering, Hunan University, Changsha, 410082, China
  
• 刊物类别：Engineering
• 刊物主题：Engineering, general
  Metallic Materials
  Chinese Library of Science
  
• 出版者：Central South University, co-published with Springer
• ISSN：2227-5223

文摘

The tensile creep resistance of Mg-5.5%Zn-(0.7%, 1.5%, 3.5%, 7.5%)Y (mass fraction, %) gravity-casting alloys was investigated systematically. The corresponding physical models were established for analyzing the microstructure evolution and creep mechanism. The results show that four second phases are found in Mg-5.5%Zn-(0.7%, 1.5%, 3.5%, 7.5%)Y alloys, including Mg₃ZnY, Mg₃Zn₆Y, Mg₃Zn₃Y₂ and Mg₇Zn₃, where the rare earth rich phase (Mg₃ZnY, Mg₃Zn₆Y, Mg₃Zn₃Y₂) with high melting point can more effectively improve the creep resistance properties of alloys than Mg₇Zn₃. With the increasing of Y content, the creep resistance of alloys is improved correspondingly. The alloys with (1.5%, 3.5%)Y addition exhibit high creep resistance at temperatures from 175 °C to 200 °C and load from 55 MPa to 70 MPa. The 7.5%Y added alloy presents excellent creep resistance even at 275 °C and 55 MPa. The second phase which shows discontinuous distribution at the grain boundary of (0.7%, 1.5%, 3.5%)Y added alloys has preferred orientation and clogs in triple junctions of grain boundary. Simultaneously, the arrangement of second phase particles along tensile direction and the formation of denuded zones are observed during the creep process. Moreover, the crack initiates in these areas and propagates along grain boundary. Compared with discontinuous second phase, the continuous skeleton-like second phase of 7.5%Y added alloy at grain boundary has a better effect on improving the creep resistance properties of alloys.