An investigation of fatigue crack growth in a cast lamellar Ti-48Al-2Cr-2Nb alloy

C. Mercer; J. Lou; W. O. Soboyejo

doi:10.1016/S0921-5093(00)00702-4

An investigation of fatigue crack growth in a cast lamellar Ti-48Al-2Cr-2Nb alloy

C. Mercer
, J. Lou
, W. O. Soboyejo

President

SUNY Polytechnic Institute

Princeton University

Research output: Contribution to journal › Article › peer-review

32 Scopus citations

Abstract

The results of a study of fatigue crack growth in a lamellar gamma titanium aluminide alloy are presented in this paper. Differences in the fatigue crack growth behavior at 25, 450 and 700°C are shown to be associated with the combined effects of different fracture modes/crack-tip deformation mechanisms and oxide-induced crack closure under cyclic loading. Crack-tip deformation was found to occur by conventional slip at 25°C. At 450 and 700°C, however, crack-tip deformation occurs via a duplex mode of slip and micro-twinning within lamellae. A higher fatigue threshold at 700°C is attributed partly to the effects of oxide-induced crack closure.

Original language	English
Pages (from-to)	235-245
Number of pages	11
Journal	Materials Science and Engineering: A
Volume	284
Issue number	1-2
DOIs	https://doi.org/10.1016/S0921-5093(00)00702-4
State	Published - May 31 2000

Keywords

Hot isostatic pressing
Lamellar gamma alloys
Paris exponent

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10.1016/S0921-5093(00)00702-4

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title = "An investigation of fatigue crack growth in a cast lamellar Ti-48Al-2Cr-2Nb alloy",

abstract = "The results of a study of fatigue crack growth in a lamellar gamma titanium aluminide alloy are presented in this paper. Differences in the fatigue crack growth behavior at 25, 450 and 700°C are shown to be associated with the combined effects of different fracture modes/crack-tip deformation mechanisms and oxide-induced crack closure under cyclic loading. Crack-tip deformation was found to occur by conventional slip at 25°C. At 450 and 700°C, however, crack-tip deformation occurs via a duplex mode of slip and micro-twinning within lamellae. A higher fatigue threshold at 700°C is attributed partly to the effects of oxide-induced crack closure.",

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AU - Mercer, C.

AU - Lou, J.

AU - Soboyejo, W. O.

PY - 2000/5/31

Y1 - 2000/5/31

N2 - The results of a study of fatigue crack growth in a lamellar gamma titanium aluminide alloy are presented in this paper. Differences in the fatigue crack growth behavior at 25, 450 and 700°C are shown to be associated with the combined effects of different fracture modes/crack-tip deformation mechanisms and oxide-induced crack closure under cyclic loading. Crack-tip deformation was found to occur by conventional slip at 25°C. At 450 and 700°C, however, crack-tip deformation occurs via a duplex mode of slip and micro-twinning within lamellae. A higher fatigue threshold at 700°C is attributed partly to the effects of oxide-induced crack closure.

AB - The results of a study of fatigue crack growth in a lamellar gamma titanium aluminide alloy are presented in this paper. Differences in the fatigue crack growth behavior at 25, 450 and 700°C are shown to be associated with the combined effects of different fracture modes/crack-tip deformation mechanisms and oxide-induced crack closure under cyclic loading. Crack-tip deformation was found to occur by conventional slip at 25°C. At 450 and 700°C, however, crack-tip deformation occurs via a duplex mode of slip and micro-twinning within lamellae. A higher fatigue threshold at 700°C is attributed partly to the effects of oxide-induced crack closure.

KW - Hot isostatic pressing

KW - Lamellar gamma alloys

KW - Paris exponent

UR - https://www.scopus.com/pages/publications/0034035838

U2 - 10.1016/S0921-5093(00)00702-4

DO - 10.1016/S0921-5093(00)00702-4

M3 - Article

SN - 0921-5093

VL - 284

SP - 235

EP - 245

JO - Materials Science and Engineering: A

JF - Materials Science and Engineering: A

IS - 1-2

ER -

An investigation of fatigue crack growth in a cast lamellar Ti-48Al-2Cr-2Nb alloy

Abstract

Keywords

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