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

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Abstract

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.

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Authors and Affiliations

  1. College of Materials Science and Engineering, Chongqing University, Chongqing, 400045, China

    Xianhua Chen  (陈先华), Lizi Liu & Fusheng Pan

  2. National Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing, 400045, China

    Xianhua Chen  (陈先华) & Fusheng Pan

  3. Chongqing Academy of Science and Technology, Chongqing, 401123, China

    Fusheng Pan

Authors
  1. Xianhua Chen  (陈先华)
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  2. Lizi Liu
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  3. Fusheng Pan
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Correspondence to Xianhua Chen  (陈先华).

Additional information

Funded by the National Natural Science Foundation of China (No.51571043), the International Science & Technology Cooperation Program of China (No.2014DFG52810) and the Fundamental Research Funds for the Central Universities (No.106112015CDJZR135515)

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Chen, X., Liu, L. & Pan, F. Strength improvement in ZK60 magnesium alloy induced by pre-deformation and heat treatment. J. Wuhan Univ. Technol.-Mat. Sci. Edit. 31, 393–398 (2016). https://doi.org/10.1007/s11595-016-1381-0

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  • DOI: https://doi.org/10.1007/s11595-016-1381-0

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