Effect of the hot roll working on the superplasticity of the SiCp/6061 aluminum alloy composite made by a Vortex method

Takeo Hikosaka, Tsunemichi Imai, Toshiro Kobayashi, Hiroyuki Toda

Research output: Contribution to journalArticle

Abstract

Effect of hot rolling and testing temperature on superplastic characteristics of a SiCp/6061 aluminum alloy composite made by a vortex method before squeeze casting and extrusion were investigated in order to make clear the superplastic deformation mechanism. Total rolling strain of about 94% was given to the composites in rolling temperatures from 843 K to 873 K and in the rolling strain per passes of 0.05 to 0.30. Fine grain size of about 1.6 μm was obtained in the composite rolled at temperature of 573 K and at the strain per pass of 0.10. The flow stress was not so effected by rolling strain per passes, and the composite exhibits m-value of 0.33 and the maximum total elongation of about 350% at the strain rate of 0.24 s-1 and at 853 K. Total elongation of more than 100% was obtained in the wide strain rate region from 0.003 to 1.30s-1 and in rolling temperatures of 573 K, 673 K, and 723 K. Relationship between ε1/2 and σ became linear when exponent of n = 2 was selected. Apparent activation energy determined from relationship between strain rate and effective stress (= flow stress minus threshold stress) was higher than that of lattice self diffusion of aluminum so that it is thought that high strain rate superplasticity of the composite could occur by grain boundary sliding, and grain boundary diffusion and liquid phase accommodation mechanisms. On the fracture surface of the composite after superplastic deformation, filaments and cavities in striation structures were observed and it became clear that on the microstructural level superplastic phenomena occur.

Original languageEnglish
Pages (from-to)600-606
Number of pages7
JournalKeikinzoku/Journal of Japan Institute of Light Metals
Volume49
Issue number12
DOIs
Publication statusPublished - Jan 1 1999

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Superplasticity
Aluminum alloys
Vortex flow
Strain rate
Composite materials
Superplastic deformation
Plastic flow
Elongation
Squeeze casting
Temperature
Grain boundary sliding
Hot rolling
Aluminum
Extrusion
Grain boundaries
Activation energy
Liquids
Testing

All Science Journal Classification (ASJC) codes

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

Cite this

Effect of the hot roll working on the superplasticity of the SiCp/6061 aluminum alloy composite made by a Vortex method. / Hikosaka, Takeo; Imai, Tsunemichi; Kobayashi, Toshiro; Toda, Hiroyuki.

In: Keikinzoku/Journal of Japan Institute of Light Metals, Vol. 49, No. 12, 01.01.1999, p. 600-606.

Research output: Contribution to journalArticle

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