Effects of alloying elements on creep of tiai alloys with fine lamellar structures

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

Detail(s)

Original languageEnglish
Pages (from-to)272-273
Journal / PublicationTransactions of Nonferrous Metals Society of China (English Edition)
Volume9
Issue numberSUPPL. 1
Publication statusPublished - 1999
Externally publishedYes

Abstract

Creep experiments have been conducted on five powder-metallurgy TiAI alloys with fine grains (65~80/uni), fine lamellar spacings (0. 1 ∼0. 16 ;tm), and different compositions [Ti-47Al( + Cr, ∼Nb, Ta, W, Si) ] at temperatures of 7601 and 8151 and stresses from 35 to 723 MPa. Results show that ∼at a given lamellar spacing 1 % Nb(mole fraction) with 1 % Ta and replacing 0.2% Ta with 0.2% W induced little effect, but addition of 0.3% Si decreased the creep resistance by a factor of 3∼4 under otherwise identi∼cal conditions. These different effects of different alloying elements are interpreted in terms of the interaction of alloy segregants with misfit and/or misorientaion dislocations at the lamellar interface. That is, the interac∼tion retards or facilitates the climb of interfacial dislocations, which is rate-controlling during creep, depending ∼on the size of the segregants relative to the host atoms.

Research Area(s)

  • Creep alloying elements, Lamellar structures, Tial alloys fine

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