Effect of extrusion temperature on the microstructure of a powder metallurgy TiAl-based alloy

Journal Article · Wed Jan 15 04:00:00 EST 1997 · Scripta Materialia

DOI:https://doi.org/10.1016/S1359-6462(96)00353-3· OSTI ID:417908

Hsiung, L M; Nieh, T G ^[1]; Clemens, D R ^[2]

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1. Lawrence Livermore National Lab., CA (United States)
2. Pratt and Whitney, West Palm Beach, FL (United States). Advanced Engineering Operations

In order to balance low temperature ductility, fracture toughness and high temperature properties of {gamma}-TiAl aluminide alloys, recent developments of the alloys have focused on refining the {gamma}/{alpha}{sub 2} full lamellar (FL) microstructure through advanced processing such as powder metallurgy (P/M). Resulted from a refined FL microstructure (both smaller lamellar grain size and thinner lamellar interface spacing) in the P/M fabricated titanium aluminide alloys, the mechanical properties of the alloys have been demonstrated to be superior to those of the aluminide alloys fabricated by conventional ingot metallurgy (I/M). However, since the microstructure of rapidly-solidified aluminide powder used in P/M process is not in an equilibrium state, the microstructures of P/M aluminide alloys are expected to be sensitive to the processing history. Accordingly, the optimization of microstructure-property of a P/M alloy through an appropriate P/M process control becomes an important issue. The purpose of this investigation is therefore aiming at understanding the effect of extrusion temperature on the microstructure of a P/M titanium aluminide alloy.

• DOE Contract Number: W-7405-ENG-48; AC05-84OR21400
• OSTI ID: 417908
• Journal Information: Scripta Materialia, Journal Name: Scripta Materialia Journal Issue: 2 Vol. 36; ISSN 1359-6462; ISSN SCMAF7
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
ANNEALING
CHROMIUM ALLOYS
EXPERIMENTAL DATA
EXTRUSION
GRAIN SIZE
INTERMETALLIC COMPOUNDS
LAMELLAE
MICROSTRUCTURE
NIOBIUM ADDITIONS
TANTALUM ADDITIONS
TITANIUM ALLOYS
TRANSMISSION ELECTRON MICROSCOPY