Acoustic softening and hardening of aluminum in high-frequency vibration-assisted micro/meso forming

Zhehe Yao, Gap Yong Kim, Leann Faidley, Qingze Zou, Deqing Mei, Zichen Chen

Research output: Contribution to journalArticlepeer-review

17 Scopus citations


A hybrid micro/meso forming assisted by high-frequency vibration was experimentally investigated by upsetting aluminum. Experiments with various vibration amplitudes and durations were conducted. The high-frequency vibration resulted in both acoustic softening and hardening behavior. Results showed that the overall forming stress reduced by 30% when a transverse vibration of 9.3 kHz was applied, but the stress recovered once the vibration stopped. On the other hand, a hardening behavior was observed during the vibration and resulted in a permanent hardening of the material even after the vibration had stopped. The effects of acoustic softening and hardening were coupled during the vibration-assisted upsetting. It was found that larger vibration amplitude led to a more significant acoustic softening and hardening. The findings of this study provided a basis to understand the underlying mechanisms of vibration-assisted forming.

Original languageEnglish (US)
Pages (from-to)584-588
Number of pages5
JournalMaterials and Manufacturing Processes
Issue number5
StatePublished - May 1 2013

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering
  • Industrial and Manufacturing Engineering


  • Aluminum
  • Compression
  • Hardening
  • Metal forming
  • Micromanufacturing
  • Softening
  • Stresses
  • Vibration

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