Thermo-mechanical fatigue property of a surface-hardened AC4CH cast aluminum alloy

Hiroyuki Toda, Tetsuya Fukunaga, Masakazu Kobayashi, Kentaro Uesugi, Toshiro Kobayashi, Toru Yamada, Yoshio Ooba, Minako Kakizaki

Research output: Contribution to journalArticlepeer-review


The thermo-mechanical fatigue life and microstructural change under a compression-tension thermo-mechanical cyclic loading of a surface-hardened Al-Si-Mg alloy casting are investigated. A surface cold working technique using steel balls is utilized for the surface hardening. Out-of-phase type thermo-mechanical fatigue tests have been performed with the temperature range of 323-523K and the applied mechanical strain range of 0.75-2.0%. The surface-hardened material exhibits better thermo-mechanical fatigue property especially in a low cycle regime, together with higher generated stress, suggesting that it is even superior under stress-controlled loading. The differences in the stress-strain hysteresis loops and hardness variation near specimen surface between the materials with and without surface hardening have not vanished until final fracture. The observed difference in the thermo-mechanical property is attributed to some microstructural differences. The effects of damaging at the silicon particles to this difference are also investigated using the high-resolution microtomography technique. It has been clarified by microstructural observations that recovery and recrystallization are suppressed in the surface-hardened material. It can be inferred that such thermal stability is attributed to the multi-axial deformation by a combination of the surface hardening and the thermo-mechanical loading.

Original languageEnglish
Pages (from-to)236-241
Number of pages6
JournalKeikinzoku/Journal of Japan Institute of Light Metals
Issue number6
Publication statusPublished - Jun 2008
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry


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