A new tungsten-free γ–γ' Co–Al–Mo–Nb-based superalloy. (15th March 2015)

• Record Type: Journal Article
• Authors: Makineni, S.K.; Nithin, B.; Chattopadhyay, K.
• Is Part Of: Scripta materialia. Volume 98(2015)
• Page Start: 36
• Page End: 39
• Publication Date: 2015-03-15
• Subjects: Cobalt-based superalloy -- γ–γ' microstructure -- Solvus temperature -- Density -- Specific yield strength; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2014.11.009
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract : Graphical abstract: Abstract : We present the first report of a tungsten-free cobalt-based superalloy having a composition Co–10Al–5Mo–2Nb. The alloy is strengthened by cuboidal precipitates of metastable Co3 (Al, Mo, Nb) distributed throughout the microstructure. The precipitates are coherent with the face-centred cubic γ-Co matrix and possess ordered L12 structure. The microstructure is identical to the popular γ–γ' type nickel-based superalloys and that of recently reported Co–Al–W-based alloys. Being tungsten free, the reported alloy has higher specific proof stress compared to existing cobalt-based superalloys.