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 journalArticlepeer-review

11 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

All Science Journal Classification (ASJC) codes

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

Fingerprint Dive into the research topics of 'Effects of hydrogen micro pores on mechanical properties in a2024 aluminum alloys'. Together they form a unique fingerprint.

Cite this