FATIGUE-CRACK GROWTH BEHAVIOR IN A DUAL-PHASE (γ+α2) TiAl INTERMETALLICALLOY AT ELEVATED TEMPERATURES

Research output: Chapters, Conference Papers, Creative and Literary Works (RGC: 12, 32, 41, 45)32_Refereed conference paper (with ISBN/ISSN)peer-review

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Author(s)

Detail(s)

Original languageEnglish
Title of host publicationGamma Titanium Aluminides
Subtitle of host publicationProceedings of a symposium sponsored by the Structural Materials Division (SMD) of TMS held during the TMS '95 Annual Meeting
EditorsYoung-Won Kim, Richard Wagner, Masaharu Yamaguchi
PublisherThe Minerals, Metals & Materials Society
Pages893-901
Publication statusPublished - Feb 1995
Externally publishedYes

Publication series

NameTMS Annual Meeting

Conference

Title1995 124th TMS Annual Meeting
PlaceUnited States
CityLas Vegas
Period13 - 16 February 1995

Abstract

Fatigue-crack propagation behavior in a Ti-47.3Al-2.3Nb-1.5Cr-0.4V (at.%) alloy is examined at 650 and 800°C in two markedly different microstructural conditions, namely a duplex (fine, equiaxed) and fully-lamellar (coarse, microlaminated) microstructures; results are compared with those obtained at room temperature. It is found that the lamellar microstructure exhibits increased fatigue resistance compared to the duplex structure at all temperatures, principally due to shielding from crack deflection, microcracking and shear-ligament bridging, although the effect of the bridging is progressively diminished under cyclic loads. The extent of improvement, however, is significantly lower during cyclic fatigue compared to monotonic fracture. For both (γ+α2) microstructures, maximum resistance to fatigue-crack growth is seen at 800°C; growth rates, however, are faster at 650°C than at ambient temperatures. Such variations in fatigue resistance with test temperature are attributed to intrinsic differences in crack-tip deformation at 800°C and 650°C, that respectively correspond to temperatures above and below the ductile-to-brittle transition temperature for γ-TiAl (∼700°C).

Citation Format(s)

FATIGUE-CRACK GROWTH BEHAVIOR IN A DUAL-PHASE (γ+α2) TiAl INTERMETALLICALLOY AT ELEVATED TEMPERATURES. / Venkateswara Rao, K. T.; Kim, Y-W.; Ritchie, R. O.

Gamma Titanium Aluminides: Proceedings of a symposium sponsored by the Structural Materials Division (SMD) of TMS held during the TMS '95 Annual Meeting. ed. / Young-Won Kim; Richard Wagner; Masaharu Yamaguchi. The Minerals, Metals & Materials Society, 1995. p. 893-901 (TMS Annual Meeting).

Research output: Chapters, Conference Papers, Creative and Literary Works (RGC: 12, 32, 41, 45)32_Refereed conference paper (with ISBN/ISSN)peer-review