Effect of microstructure on the tensile, fatigue crack growth, and creep behavior of a Ti-25Al-17Nb orthorhombic alloy

C. J. Boehlert, B. S. Majumdar, D. B. Miracle

Research output: Chapter in Book/Report/Conference proceedingConference contribution

  • 5 Citations

Abstract

The alloy Ti-25Al-17Nb(at%) is a candidate matrix material for metal matrix composite (MMC) applications. It belongs to a class of alloys sometimes known as orthorhombic alloys, because one of the dominant phases has an orthorhombic structure (based on the compound Ti2AlNb). There are generally three dominant phases in this intermetallic system: namely, a B2 phase (ordered bcc), alpha-2 phase (ordered hexagonal, based on Ti3Al), and an ordered orthorhombic (O) phase. The volume fraction of these phases, and, to a certain extent, their morphology, can be varied by suitable thermo-mechanical treatments. Consequently, there is scope to optimize the microstructure for specific property requirements. In this work, different heat treatments were applied to the above material in the as-rolled condition. Important property goals from the point of view of MMC requirements were room-temperature elongation, fatigue crack growth resistance, fracture toughness, and creep resistance. These properties were evaluated, and their relation to the microstructure was studied to arrive at an understanding of the required optimum microstructure. The slip and fracture processes of the constituent phases were studied and are discussed.

Original languageEnglish (US)
Title of host publicationFatigue and Fracture of Ordered Intermetallic Materials II
PublisherMinerals, Metals & Materials Soc (TMS)
Pages135-153
Number of pages19
StatePublished - 1995
Externally publishedYes
EventProceedings of the TMS Materials Week'94 Symposium - Rosemont, IL, USA

Other

OtherProceedings of the TMS Materials Week'94 Symposium
CityRosemont, IL, USA
Period10/4/9410/6/94

Profile

Microstructure
Fatigue crack propagation
Composite materials
Metals
Thermomechanical treatment
Creep resistance
Intermetallics
Fracture toughness
Elongation
Volume fraction
Creep
Heat treatment
Temperature

ASJC Scopus subject areas

  • Engineering(all)

Cite this

Boehlert, C. J., Majumdar, B. S., & Miracle, D. B. (1995). Effect of microstructure on the tensile, fatigue crack growth, and creep behavior of a Ti-25Al-17Nb orthorhombic alloy. In Fatigue and Fracture of Ordered Intermetallic Materials II (pp. 135-153). Minerals, Metals & Materials Soc (TMS).

Effect of microstructure on the tensile, fatigue crack growth, and creep behavior of a Ti-25Al-17Nb orthorhombic alloy. / Boehlert, C. J.; Majumdar, B. S.; Miracle, D. B.

Fatigue and Fracture of Ordered Intermetallic Materials II. Minerals, Metals & Materials Soc (TMS), 1995. p. 135-153.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Boehlert, CJ, Majumdar, BS & Miracle, DB 1995, Effect of microstructure on the tensile, fatigue crack growth, and creep behavior of a Ti-25Al-17Nb orthorhombic alloy. in Fatigue and Fracture of Ordered Intermetallic Materials II. Minerals, Metals & Materials Soc (TMS), pp. 135-153, Proceedings of the TMS Materials Week'94 Symposium, Rosemont, IL, USA, 4-6 October.
Boehlert CJ, Majumdar BS, Miracle DB. Effect of microstructure on the tensile, fatigue crack growth, and creep behavior of a Ti-25Al-17Nb orthorhombic alloy. In Fatigue and Fracture of Ordered Intermetallic Materials II. Minerals, Metals & Materials Soc (TMS). 1995. p. 135-153.

Boehlert, C. J.; Majumdar, B. S.; Miracle, D. B. / Effect of microstructure on the tensile, fatigue crack growth, and creep behavior of a Ti-25Al-17Nb orthorhombic alloy.

Fatigue and Fracture of Ordered Intermetallic Materials II. Minerals, Metals & Materials Soc (TMS), 1995. p. 135-153.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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