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Influence of isochronal heat treatment on damping behavior of AZ61 alloy

  • Liu Chu-ming  (刘楚明)
  • Liu Zi-juan  (刘子娟)
  • Zhu Xiu-rong  (朱秀荣)
  • Hu Bi-wen  (胡必文)
  • Wang Rong  (王荣)
  • Wang Meng-jun  (王孟君)
Article

Abstract

Strain amplitude dependence of the logarithmic decrement was measured and studied on an AZ61 magnesium alloy at room temperature. Measurements were carried out before and after isochronal thermal treatment step by step with increasing temperature. For all specimens, the strain dependence of the logarithmic decrement exhibits two regions. At lower strains the logarithmic decrement is strain independent and in the higher strain region it depends strongly on strain amplitude. The strain-independent logarithmic decrement is mainly composed of thermoelastic damping and dislocation damping, which can be explained by Granato-Lücke theory. In addition, the strain-independent logarithmic decrement for the specimens annealed at higher temperatures is a little lower than that for as-cast specimen, and it increases with increasing temperature of heat treatment. Microstructure changes due to heat treatment are responsible for changes of the logarithmic decrement.

Key words

AZ61 magnesium alloy heat treatment damping dislocation 

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Copyright information

© Published by: Central South University Press, Sole distributor outside Mainland China: Springer 2007

Authors and Affiliations

  • Liu Chu-ming  (刘楚明)
    • 1
    • 2
  • Liu Zi-juan  (刘子娟)
    • 1
  • Zhu Xiu-rong  (朱秀荣)
    • 3
  • Hu Bi-wen  (胡必文)
    • 4
  • Wang Rong  (王荣)
    • 2
  • Wang Meng-jun  (王孟君)
    • 4
  1. 1.School of Materials Science and EngineeringCentral South UniversityChangshaChina
  2. 2.State Key Laboratory of Material Processing and Die & Mould TechnologyWuhanChina
  3. 3.Light Materials InstituteNingbo Branch of Enginery Science Academy of ChinaNingboChina
  4. 4.Testing Technology Institute of YichangYichangChina

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