γ' Precipitation and Growth Kinetics in Mechanically Alloyed Ni-Al

• Tang, QingXin

• Ukai, Shigeharu

• Minami, Akinobu

• Hayashi, Shigenari

抄録

The precipitation and growth kinetics ofγ' precipitates, which are strengthening factors in Ni-base oxide dispersion strengthened (ODS) superalloys, were investigated. The cuboidal-type γ' precipitates are formed in conventional arc-melted Ni-Al alloys, whereas spherical-type precipitates are formed in the mechanically alloyed (MAed) specimens. The morphology is controlled by a lattice misfit between the γ' precipitates and the matrix at the aging temperature of 800℃. The growth kinetics of the γ' precipitates can be followed by Ostwald ripening. The Arrhenius plot yielded a lower activation energy for the solute atom diffusion in MAed specimens, which is attributed to their high dislocation density and nanosized grains.

収録刊行物

• Advances in Materials Science and Engineering

  Advances in Materials Science and Engineering 2011 137387-, 2011

  Hindawi Publishing Corporation

詳細情報

• CRID: 1050845763939557376
• NII論文ID: 120003370689
• HANDLE: 2115/47209
• ISSN: 16876822
• 本文言語コード: en
• 資料種別: journal article
• データソース種別:
  • IRDB
  • CiNii Articles