326 The effects of environment on fatigue crack propagation and thermal desorption spectroscopy in TiAl intermetallic compounds

Minoshima, Kohji; Obara, K.; Minamino, Naoki; Komai, Kenjiro

doi:10.1299/jsmezairiki.2001.0_281

Cited by 1 publication

(2 citation statements)

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“…Also, similar results have been obtained under fatigue of their light weight, good high-temperature mechanical loading [19] or for polysynthetic textured (PST) TiAl crysproperties, and oxidation resistance. [1] However, they exhibit tals.…”

Section: Introductionsupporting

confidence: 57%

“…[20,21] Fatigue-crack growth rates were enhanced by moislow ductility and poor fracture toughness at ambient temperture in the test environment. [19] When PST crystals with a ature. With alloy modification and microstructural control, soft orientation are deformed at room temperature at slow their drawbacks have been improved significantly during strain-rates, the tensile elongation was greatly dependent the last decades, [2][3][4][5][6] and, consequently, these intermetallic on the testing atmosphere and was lower in air than in alloys have begun to be utilized.…”

Section: Introductionmentioning

confidence: 99%

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Microstructural effects on moisture-induced embrittlement of isothermally forged TiAl-based intermetallic alloys

Tsuyumu

Kaneno

Inoue

et al. 2003

Metall Mater Trans A

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By using isothermally forged TiAl-based intermetallic alloys, various microstructures (of ␥ -grain, duplex, dual-phase, and fully lamellar microstructures) were prepared. These TiAl-based intermetallic alloys were tensile tested in vacuum and air as functions of strain rate and temperature to investigate microstructural effects on the moisture-induced embrittlement. All the intermetallic alloys with different microstructures showed different levels of reduced tensile stress (or elongation) in air at room temperature. The reduction in tensile stress (or elongation) due to testing in air diminishes as the testing temperature (or strain-rate) increases. From the fracture stress-temperature curves, it was found that the ␥ -grain microstructure was the most resistant to the moisture-induced embrittlement, and the dual-phase microstructure was the most susceptible to the moisture-induced embrittlement. Also, the moisture-induced embrittlement of the TiAl-based intermetallic alloys with a fully lamellar microstructure depends on the lamellar spacing and is reduced with decreasing lamellar spacing. The possible reasons for the observed microstructural effect on the moisture-induced embrittlement were discussed, in association with hydrogen behavior and properties in the constituent phases and at some interfaces.

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Section: Introductionsupporting

confidence: 57%

Section: Introductionmentioning

confidence: 99%