Effects of temperature on the fatigue crack growth behavior of cast gamma-based titanium aluminides

Authors
Mercer, C Lou, J Allameh, SM Soboyejo, WO
Citation
C. Mercer et al., Effects of temperature on the fatigue crack growth behavior of cast gamma-based titanium aluminides, MET MAT T A, 32(11), 2001, pp. 2781-2794
Citations number
16
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science",Metallurgy
Journal title
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
ISSN journal
10735623 → ACNP
Volume
32
Issue
11
Year of publication
2001
Pages
2781 - 2794
Database
ISI
SICI code
1073-5623(200111)32:11<2781:EOTOTF>2.0.ZU;2-Q
Abstract
This article reports the results of an experimental study of the effects of temperature (25 degreesC, 450 degreesC, and 700 degreesC) on the fatigue c rack growth behavior of three near-commercial cast gamma titanium aluminide alloys (Ti-48Al-2Cr-2Nb, Ti-47Al-2Mn-2Nb + 0.8 pct TiB2, and Ti-45Al-2Mn-2 Nb + 0.8 pct TiB2). The trends in the fatigue crack growth rate data are ex plained by considering the combined effects of crack-tip deformation mechan isms and oxide-induced crack closure. Faster fatigue crack growth rates at 450 degreesC are attributed to the high incidence of irreversible deformati on-induced twinning, while slower crack growth rates at 700 degreesC are du e to increased deformation by slip and the effects of oxide-induced crack c losure.