Multi-pass high-pressure sliding (MP-HPS) for grain refinement and superplasticity in metallic round rods

Yongpeng Tang, Kosei Sumikawa, Yoichi Takizawa, Manabu Yumoto, Yoshiharu Otagiri, Zenji Horita

Research output: Contribution to journalArticle

Abstract

In this study, the multi-pass high-pressure sliding (MP-HPS) process was applied for grain refinement of rods with an upsized dimension. To achieve a homogeneous microstructure throughout the cross section of the rod, the rod samples are rotated with 60° around the longitudinal axis (MP-HPS-R) or are shifted upward and downward from the mid-height on the cross-sectional plane (MP-HPS-S). A homogeneous microstructure with an average grain size of ~ 200 nm for an Al-3 wt%Mg-0.2 wt%Sc alloy and ~ 160 nm for Inconel 718 were developed through both of the MP-HPS processes. The rods of the Al-3 wt%Mg-0.2 wt%Sc alloy and Inconel 718 after MP-HPS processing exhibited superplasticity with total elongations more than 600% and 400%, respectively. A finite-element method (FEM) was used to simulate the magnitude of the strain including its distribution on the cross section of the rod through processing by MP-HPS-R. It was demonstrated that microstructural homogeneity was developed in the rod processed by the MP-HPS-R but inhomogeneity was left by the MP-HPS-S.

Original languageEnglish
Pages (from-to)108-118
Number of pages11
JournalMaterials Science and Engineering A
Volume748
DOIs
Publication statusPublished - Mar 4 2019

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superplasticity
Superplasticity
Grain refinement
sliding
rods
Inconel (trademark)
microstructure
Microstructure
cross sections
Processing
elongation
homogeneity
Elongation
finite element method
inhomogeneity
grain size
Finite element method

All Science Journal Classification (ASJC) codes

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

Cite this

Multi-pass high-pressure sliding (MP-HPS) for grain refinement and superplasticity in metallic round rods. / Tang, Yongpeng; Sumikawa, Kosei; Takizawa, Yoichi; Yumoto, Manabu; Otagiri, Yoshiharu; Horita, Zenji.

In: Materials Science and Engineering A, Vol. 748, 04.03.2019, p. 108-118.

Research output: Contribution to journalArticle

Tang, Yongpeng ; Sumikawa, Kosei ; Takizawa, Yoichi ; Yumoto, Manabu ; Otagiri, Yoshiharu ; Horita, Zenji. / Multi-pass high-pressure sliding (MP-HPS) for grain refinement and superplasticity in metallic round rods. In: Materials Science and Engineering A. 2019 ; Vol. 748. pp. 108-118.
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