Cu-Zn 合金の転位強化因子に及ぼす結晶粒径の影響

Translated title of the contribution: Effect of grain size of Cu-Zn alloys on dislocation-strengthening factors

Koutarou Nakagawa, Momoki Hayashi, Kozue Takano-Satoh, Hirotaka Matsunaga, Hiroyuki Mori, Amane Kitahara, Yusuke Onuki, Shigeru Suzuki, Shigeo Sato

Research output: Contribution to journalArticlepeer-review

Abstract

Relationship between dislocation multiplication and work hardening of tensile-deformed Cu-Zn alloys with different grain sizes was investigated. X-ray diffraction line-profile analysis was employed to evaluate dislocation parameters. It was confirmed that dislocation multiplication was enhanced with a decrease in the grain sizes. This was mainly caused by GN(Geometrically Necessary)dislocation, which was characterized by KAM(Kernel Average Misorientation)in EBSD(Electron Back Scatter Diffraction). The strength of dislocation hardening was evaluated from the α value in the Bailey-Hirsch equation: σ = σ0 + MTαGb√ρ. The α values were estimated by plotting the flow stress against square root of dislocation density. The α values became smaller with the decrease in the grain sizes, suggesting that the strength of dislocations hardening for unit length of dislocation became smaller. In order to elucidate the origin of the relationship between the grain size and the α values, the influence of grain size on the fraction of GN dislocation density as well as the outer radius of dislocation strain field. Whereas the effect of the fraction of the GN dislocation on the α values was small, the outer radius of dislocation strain field strongly affected the α values.

Translated title of the contributionEffect of grain size of Cu-Zn alloys on dislocation-strengthening factors
Original languageJapanese
Pages (from-to)374-381
Number of pages8
JournalNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
Volume84
Issue number12
DOIs
Publication statusPublished - 2020 Dec 1

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

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