Effects of quenching rate on mechanical properties of 6061 aluminum alloy

S. Morita, Hiroyuki Toda, A. Takahashi, A. Hoshiyama, T. Kobayashi, H. Nagashima

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

The effects of quenching rate after a solution treatment on strength and fracture toughness of a 6061 aluminum alloy have been investigated, varying the width of PFZ layer and coarse secondary phase particles at grain boundaries by changing the quenching rate utilizing both water quenching and air-cooling. In-situ observation of the fracture toughness tests was also performed to investigate the effects of such microstructural parameters on crack initiation and propagation behaviors. By decreasing the quenching rate, the width of the PFZ layer increases from about 40 to 310 nm, and density and size of the coarse particles increase at the grain boundaries. Mechanical properties such as tensile strength, 0.2% proof stress, elongation, fracture toughness and crack propagation resistance are decreased simultaneously. Especially, the effects of quenching rate on the strength and the crack propagation resistance are remarkable. Such degradation of the mechanical properties is attributed to expansion of the PFZ layer with decreases in quenching rate. It causes localization of plastic deformation, and consequently, transition of fracture mechanisms from grain interior ductile fracture to grain boundary ductile fracture at the PFZ layers. In-situ SEM observation reveals that the effects of the coarse particles at grain boundaries are much less effective than those of the PFZ.

Original languageEnglish
Pages (from-to)307-312
Number of pages6
JournalKeikinzoku/Journal of Japan Institute of Light Metals
Volume51
Issue number6
DOIs
Publication statusPublished - Jan 1 2001
Externally publishedYes

Fingerprint

Quenching
Aluminum alloys
Mechanical properties
Grain boundaries
Fracture toughness
Crack propagation
Ductile fracture
Crack initiation
Elongation
Plastic deformation
Tensile strength
Cooling
Degradation
Scanning electron microscopy
Water
Air

All Science Journal Classification (ASJC) codes

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

Cite this

Effects of quenching rate on mechanical properties of 6061 aluminum alloy. / Morita, S.; Toda, Hiroyuki; Takahashi, A.; Hoshiyama, A.; Kobayashi, T.; Nagashima, H.

In: Keikinzoku/Journal of Japan Institute of Light Metals, Vol. 51, No. 6, 01.01.2001, p. 307-312.

Research output: Contribution to journalArticle

Morita, S. ; Toda, Hiroyuki ; Takahashi, A. ; Hoshiyama, A. ; Kobayashi, T. ; Nagashima, H. / Effects of quenching rate on mechanical properties of 6061 aluminum alloy. In: Keikinzoku/Journal of Japan Institute of Light Metals. 2001 ; Vol. 51, No. 6. pp. 307-312.
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