High-pressure torsion for enhanced atomic diffusion and promoting solid-state reactions in the aluminum-copper system

Keiichiro Oh-Ishi, Kaveh Edalati, Hyoung Seop Kim, Kazuhiro Hono, Zenji Horita

研究成果: Contribution to journalArticle査読

127 被引用数 (Scopus)

抄録

This study reports that solid-state reactions occur by the application of high-pressure torsion (HPT) to the Al-Cu system even at low homologous temperature. A bulk form of disc consisting of two separate half-discs of pure Al and pure Cu are processed by HPT at ambient temperature under a pressure of 6 GPa. X-ray diffraction analysis and high-resolution transmission electron microscopy confirm the formation of different intermetallic phases such as Al2Cu, AlCu and Al4Cu9, as well as the dissolution and supersaturation of Al and Cu in each matrix. It is shown that the diffusion coefficient is enhanced by 1012-1022 times during the HPT processing in comparison with the lattice diffusion and becomes comparable to the surface diffusion. The enhanced diffusion is attributed to the presence of a high density of lattice defects such as vacancies, dislocations and grain boundaries produced by HPT processing.

本文言語英語
ページ(範囲)3482-3489
ページ数8
ジャーナルActa Materialia
61
9
DOI
出版ステータス出版済み - 5 2013

All Science Journal Classification (ASJC) codes

  • 電子材料、光学材料、および磁性材料
  • セラミックおよび複合材料
  • ポリマーおよびプラスチック
  • 金属および合金

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