Phase Equilibria and Microstructure on γ′ Phase in Co-Ni-Al-W System

• Shinagawa Kazuya

  Department of Materials Science, Graduate School of Engineering, Tohoku University

• Omori Toshihiro

  Department of Materials Science, Graduate School of Engineering, Tohoku University

• Sato Jun

  Department of Materials Science, Graduate School of Engineering, Tohoku University

• Oikawa Katsunari

  Department of Materials Science, Graduate School of Engineering, Tohoku University

• Ohnuma Ikuo

  Department of Materials Science, Graduate School of Engineering, Tohoku University

• Kainuma Ryosuke

  Institute of Multidisciplinary Research for Advanced Materials, Tohoku University

• Ishida Kiyohito

  Department of Materials Science, Graduate School of Engineering, Tohoku University

Bibliographic Information

Other Title

• Phase Equilibria and Microstructure on γ' Phase in Co-Ni-Al-W System
• Phase equilibria and microstructure on g phase in Co Ni al W system
• Phase Equilibria and Microstructure on γ′ Phase in Co-Ni-Al-W System

Abstract

Phase equilibria between the γ and γ′ phases at 900°C in the Co-(10–70)Ni-Al-W system were determined by electron probe microanalysis (EPMA) and X-ray diffractometry (XRD). It was found that the γ′ phase with L1₂ structure continuously exists from the Co side to the Ni side in Co-Ni-Al-W system and that it widens to the low W region with increasing Ni content. The partition of Al into the γ′ phase increased with Ni content, while the W changed from a γ′ former to a γ former by increase of Ni content. Differential scanning calorimetry (DSC) measurements also revealed that the γ′ solvus temperature increases with Ni content, while the solidus temperature is hardly affected by such content. The lattice parameter of the γ and γ′ phases and the mismatch decreased with increasing Ni content, which caused the morphologic change of the γ′ precipitates from cubes to spheres.

Journal

• MATERIALS TRANSACTIONS

  MATERIALS TRANSACTIONS 49 (6), 1474-1479, 2008

  The Japan Institute of Metals and Materials

Keywords

• cobalt-nickel-aluminum-tungsten
• phase equilibria
• phase stability
• L1<SUB>2</SUB> compound
• lattice parameter
• superalloy

Details

• CRID: 1390282679225765504
• NII Article ID: 10021147933
• NII Book ID: AA1151294X
• DOI: 10.2320/matertrans.mer2008073
• ISSN: 13475320
• ISSN: 13459678
• HANDLE: 10097/51935
• NDL BIB ID: 9519626
• Web Site: https://tohoku.repo.nii.ac.jp/records/26544
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I9519626
• Web Site: https://www.jstage.jst.go.jp/article/matertrans/49/6/49_MER2008073/_pdf
• Text Lang: en
• Data Source:
  • JaLC
  • IRDB
  • NDL
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed