Effect of grain size on creep of Ti-53.4mol%Al intermetallics at 1100 K

Nagai, Hashiru; Takahashi, Tohru; Oikawa, Hiroshi

doi:10.1007/bf00714087

Cited by 24 publications

(3 citation statements)

References 6 publications

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“…For TiAl the activation energy or creep rate controlling factor changes from low.to high strain rates (71,72). This change in rate controlling process was also found for T i 4 (73).…”

Section: Fracture Toughnesssupporting

confidence: 49%

The Technology of Titanium Aluminides for Aerospace Applications

Beddoes

Wallace

Malherbe

1992

Materials and Manufacturing Processes

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Ttanium aluminide intermetallics are of engineering interest due to an attractive combination of mechanical properties and density. This paper discusses the properties and processing of titanium aluminides, concentrating on near y-TiAl compositions. Inherent structural and deformation characteristics are described. The relationship between microstructure and prooessing is examined with emphasis placed on powder metallurgical, HIP'ing and hot deformation processes. Mechanical properties attainable wAh near y-TiAl alloys are presented and the effect of ternary elements examined.

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“…For TiAl the activation energy or creep rate controlling factor changes from low.to high strain rates (71,72). This change in rate controlling process was also found for T i 4 (73).…”

Section: Fracture Toughnesssupporting

confidence: 49%

The Technology of Titanium Aluminides for Aerospace Applications

Beddoes

Wallace

Malherbe

1992

Materials and Manufacturing Processes

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“…Al-Ti alloys are widely used in aerospace industry because of their excellent corrosion resistance, high temperature oxidation resistance and mechanical properties [18,19]. As Al and Ti are reactive metal (E°A l(III)/Al = -1.67 V vs. NHE, E°T i(II)/Al = -1.64 V vs. NHE), Al-Ti alloy can not be obtained from an aqueous electrolyte.…”

Section: Electrodeposition Of Al-ti Alloymentioning

confidence: 99%

Electrochemical Preparation of Titanium and its Alloy in Ionic Liquid

Xu¹,

Ye²

2015

Ionic Liquids - Current State of the Art

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“…[3,4] The comment is motivated, in part, by the fact that the majority of studies addressing the creep behavior of ␥-TiAl have been based on the phenomenological description of pure metal creep. [5][6][7]9,10,[12][13][14] Despite the fact that creep curves of TiAl have a general shape that is similar to pure metals, the limited nature of secondary creep and increased importance of tertiary or ''inverse'' creep suggest that the traditional method for describing pure metal creep is not valid for TiAl. Published values of Q creep range from 192 to 700 kJ/mol, [5][6][7][8][9][10][11] and n has generally been measured to be much closer to 8 than 4.5.…”

Section: Introductionmentioning

confidence: 99%

Microstructural evolution during creep of single-phase gamma TiAl

Hemker

1998

Metall Mater Trans A

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Mechanical experiments and transmission electron microscope (TEM) observations indicate that single-phase ␥-TiAl does exhibit primary, secondary, and inverse creep, but not steady-state creep. Constant stress creep tests of ␥-Ti-51Al-2Mn conducted at 550 ЊC, 597 ЊC, and 703 ЊC have been interrupted at different stages in the creep process. The TEM observations of these specimens were used to document the microstructural evolution that occurs during creep. Superdislocation motion was activated and subsequently exhausted during primary creep. Ordinary dislocations were observed to be pinned during primary creep, but with time, these dislocations began to bow past their pinning points. The extended region of inverse creep has been related to the bowing and multiplication of these ordinary dislocations. Quantitative measurements of dislocation density were performed, and while the density of superdislocations remained constant, the density of ordinary dislocations increased by an order of magnitude during the life of a creep test. The acceleration in the creep rate has been related to this increase in the density of ordinary dislocations, but the change in dislocation density was not high enough to account for the increase in the creep rate. This suggests that both the mobility and density of ordinary dislocations increase as creep progresses.

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Effect of grain size on creep of Ti-53.4mol%Al intermetallics at 1100 K

Cited by 24 publications

References 6 publications

The Technology of Titanium Aluminides for Aerospace Applications

The Technology of Titanium Aluminides for Aerospace Applications

Electrochemical Preparation of Titanium and its Alloy in Ionic Liquid

Microstructural evolution during creep of single-phase gamma TiAl

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