Investigation of boron distribution in a TiAl-based alloy using particle-tracking

Journal Article · Mon Jan 01 04:00:00 EST 1996 · Scripta Materialia

DOI:https://doi.org/10.1016/1359-6462(95)00507-2· OSTI ID:186786

Pu, Z; Wu, K H ^[1]

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1. Florida International Univ., Miami, FL (United States)

One of the key shortcomings of current TiAl intermetallic alloy is the inverse relationship between tensile properties and fracture/creep resistance. TiAl-based alloys with a fully lamellar structure generally display`s high fracture toughness and creep resistance, but poor ductility. Inversely, material with a duplex microstructure has very good ductility, but poor fracture toughness and creep resistance. Research efforts have focused on overcoming this deficiency. Now that it is widely accepted that the poor ductility of lamellar structures originates from the large grain size, refining the lamellar structure of TiAl-based alloys presents itself as a feasible solution. The question remains as to how to accomplish this goal. Microalloying is considered one approach for refining the fully lamellar structure. The present authors have reported that the addition of boron can effectively refine the grain size of fully lamellar structure. However, the distribution of boron in TiAl alloys and the mechanism in boron that suppresses grain growth are not yet clear. In the present paper, the distribution of boron in a Ti-rich TiAl-based alloy, as a function of the bulk boron content, annealing temperature, and thermomechanical process, is analyzed using a Particle-Tracking Autoradiography (PTA) technique.

• OSTI ID: 186786
• Journal Information: Scripta Materialia, Journal Name: Scripta Materialia Journal Issue: 1 Vol. 34; ISSN 1359-6462; ISSN XZ503X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
ANNEALING
AUTORADIOGRAPHY
BORON
CELLULOSE ESTERS
CHEMICAL ANALYSIS
CHROMIUM ALLOYS
ETCHING
INTERMETALLIC COMPOUNDS
METALLURGICAL EFFECTS
MICROSTRUCTURE
PARTICLE TRACKS
TEMPERATURE DEPENDENCE
THERMAL NEUTRONS
THERMOMECHANICAL TREATMENTS
TITANIUM ALLOYS
VANADIUM ALLOYS