Strength improvement in ZK60 magnesium alloy induced by pre-deformation and heat treatment

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• 作者：Xianhua Chen 陈先勿/a> ; Lizi Liu ; Fusheng Pan
• 关键词：ZK60 alloy ; strength ; solid solution ; pre ; cold rolling ; aging
• 刊名：Journal of Wuhan University of Technology--Materials Science Edition
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：31
• 期：2
• 页码：393-398
• 全文大小：2,007 KB
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• 作者单位：Xianhua Chen 陈先华 (1) (2)
  Lizi Liu (1)
  Fusheng Pan (1) (2) (3)
  
  1. College of Materials Science and Engineering, Chongqing University, Chongqing, 400045, China
  2. National Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing, 400045, China
  3. Chongqing Academy of Science and Technology, Chongqing, 401123, China
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Materials Science
  Chinese Library of Science
  
• 出版者：Wuhan University, co-published with Springer
• ISSN：1993-0437

文摘

The influence of pre-deformation and heat treatment on mechanical properties of as-extruded ZK60 alloy was investigated. The experimental results indicated that the solid solution, pre-cold rolling and artificial aging treatments remarkably improved the mechanical strength of alloys compared with the as-extruded condition. Especially, pre-cold rolling in 5% reduction combined with artificial aging at 150 °C for 20 h was determined as the optimum heat treatment condition, which resulted in a yield strength of 333 MPa with an increment of 87 MPa and ultimate tensile strength of 373 MPa. High density of nanoscale precipitates in α-Mg matrix observed in this sample was beneficial to enhancing the strength. The as-extruded sample showed a typical brittle fracture while the solution treated sample exhibited ductile-fragile failure characterized by cleavage fractures, river patterns, and tear ridges. And the sample after pre-cold rolling combined with aging presented more equiaxial dimples with a great amount of cracked particles in them. The above-mentioned observations were analyzed in terms of microstructure and possible strengthening mechanism in the extruded ZK60 alloy.