Details

Autor(en) / Beteiligte

• Miyajima, Yoji
• Ichikawa, Ryu
• Adachi, Hiroki
• Yamasaki, Tohru
• Fujii, Toshiyuki
• Kato, Masaharu

Titel

Temperature and strain-rate dependence of flow stress of nanocrystalline nickel fabricated by electrolytic deposition

Ist Teil von

• Philosophical magazine letters, 2020-12, Vol.100 (12), p.571-580

Ort / Verlag

Abingdon: Taylor & Francis

Erscheinungsjahr

2020

Link zum Volltext

Quelle

Taylor & Francis Journals Auto-Holdings Collection

Beschreibungen/Notizen

• Nanocrystalline nickel, having a grain size of about 40 nm, was fabricated by electrolytic deposition and strain-rate jump tests were performed at temperaures between 77 and 473 K to obtain the strain-rate sensitivity and the activation volume . The values of changed from about 0.05 to about 0.005 with increasing stress, indicating that the deformation is governed by the motion of glide dislocations. increased as the temperature increased from 77 to 200 K, but decreased with further increase in temperature. It is concluded that the rate-controlling deformation mechanism in nanocrystalline nickel is temperature sensitive and changes from forest dislocation cutting to dislocation bowing-out and depinning from grain boundaries as the temperature increases.