ASPECTS OF FATIGUE-CRACK GROWTH IN INTERMETALLIC ALLOYS

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

1 Scopus Citations
View graph of relations

Author(s)

Detail(s)

Original languageEnglish
Pages (from-to)214-227
Journal / PublicationTransactions of Nonferrous Metals Society of China (English Edition)
Volume9
Issue numberSuppl. 1
Publication statusPublished - Jun 1999
Externally publishedYes

Abstract

The mechanisms of fatigue-crack propagation in intermetallics alloys, specifically y-TiAl, Nb3Al and MoSi2, were compared with corresponding behavior in brittle ceramics and ductile metals. This was achieved by considering the process of fatigue-crack growth as a mutual competition between intrinsic mechanisms of crack advance ahead of the crack tip (e. g. , alternating crack-tip blunting and resharpening), which promote crack growth, and extrinsic mechanisms of crack-tip shielding behind the tip (crack closure and bridging), which impede it. The differing nature of these mechanisms in brittle and ductile materials and their specific dependence upon the alternating and maximum driving forces (e. g. , ΔK and Kmax) provided a useful distinction of the process of fatigue-crack propagation in these different classes of materials.

Research Area(s)

  • γ-TiAI, fatigue-crack, Propagation, Nbi3AI, MoSi2, growth