Effects of hydrogen micro pores on mechanical properties in a2024 aluminum alloys

Hiroyuki Toda, Takaaki Inamori, Keitaro Horikawa, Kentaro Uesugi, Akihisa Takeuchi, Yoshio Suzuki, Masakazu Kobayashi

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

It has been reported that most aluminum alloys contain high-density micro pores which make an appreciable contribution to damage evolution during ductile fracture. It is reasonable to assume that the mechanical properties of aluminum alloys are more or less improved by controlling micro pores in aluminum alloys. In the present study the volume fraction of micro pores is controlled by controlling hydrogen content over a wide range. Tensile tests are performed using smooth and notched specimens at room and elevated temperatures together with a fracture toughness test. It has been shown that both strength and ductility increase with decreasing micro pore volume fraction. The elimination of micro pores has pronounced effects especially on high-temperature ductility notched tensile strength and fracture toughness. It has been observed in the in-situ observation of a room temperature tensile test that pre-existing hydrogen micro pores exhibit premature growth immediately after the onset of plastic deformation whereas the well-known particle fracture mechanism operates only after the maximum load in the alloys with the least micro pores fraction. It can be inferred that in the notched and pre-cracked specimens the premature growth of micro pores are driven by triaxial stress state thereby inducing more degradation in mechanical properties.

Original languageEnglish
Pages (from-to)2195-2201
Number of pages7
JournalMaterials Transactions
Volume54
Issue number12
DOIs
Publication statusPublished - 2013

Fingerprint

aluminum alloys
Hydrogen
Aluminum alloys
mechanical properties
porosity
Mechanical properties
Ductility
Fracture toughness
Volume fraction
hydrogen
Ductile fracture
Temperature
Plastic deformation
Tensile strength
tensile tests
fracture strength
ductility
Degradation
triaxial stresses
room temperature

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Toda, H., Inamori, T., Horikawa, K., Uesugi, K., Takeuchi, A., Suzuki, Y., & Kobayashi, M. (2013). Effects of hydrogen micro pores on mechanical properties in a2024 aluminum alloys. Materials Transactions, 54(12), 2195-2201. https://doi.org/10.2320/matertrans.L-M2013832

Effects of hydrogen micro pores on mechanical properties in a2024 aluminum alloys. / Toda, Hiroyuki; Inamori, Takaaki; Horikawa, Keitaro; Uesugi, Kentaro; Takeuchi, Akihisa; Suzuki, Yoshio; Kobayashi, Masakazu.

In: Materials Transactions, Vol. 54, No. 12, 2013, p. 2195-2201.

Research output: Contribution to journalArticle

Toda, H, Inamori, T, Horikawa, K, Uesugi, K, Takeuchi, A, Suzuki, Y & Kobayashi, M 2013, 'Effects of hydrogen micro pores on mechanical properties in a2024 aluminum alloys', Materials Transactions, vol. 54, no. 12, pp. 2195-2201. https://doi.org/10.2320/matertrans.L-M2013832
Toda, Hiroyuki ; Inamori, Takaaki ; Horikawa, Keitaro ; Uesugi, Kentaro ; Takeuchi, Akihisa ; Suzuki, Yoshio ; Kobayashi, Masakazu. / Effects of hydrogen micro pores on mechanical properties in a2024 aluminum alloys. In: Materials Transactions. 2013 ; Vol. 54, No. 12. pp. 2195-2201.
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