skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

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

Abstract

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.

Authors:
;  [1];  [2]
  1. Lawrence Livermore National Lab., CA (United States)
  2. Pratt and Whitney, West Palm Beach, FL (United States). Advanced Engineering Operations
Publication Date:
OSTI Identifier:
417908
DOE Contract Number:  
W-7405-ENG-48; AC05-84OR21400
Resource Type:
Journal Article
Journal Name:
Scripta Materialia
Additional Journal Information:
Journal Volume: 36; Journal Issue: 2; Other Information: PBD: 15 Jan 1997
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; TITANIUM ALLOYS; EXTRUSION; MICROSTRUCTURE; ALUMINIUM ALLOYS; CHROMIUM ALLOYS; NIOBIUM ADDITIONS; TANTALUM ADDITIONS; INTERMETALLIC COMPOUNDS; ANNEALING; GRAIN SIZE; LAMELLAE; TRANSMISSION ELECTRON MICROSCOPY; EXPERIMENTAL DATA

Citation Formats

Hsiung, L M, Nieh, T G, and Clemens, D R. Effect of extrusion temperature on the microstructure of a powder metallurgy TiAl-based alloy. United States: N. p., 1997. Web. doi:10.1016/S1359-6462(96)00353-3.
Hsiung, L M, Nieh, T G, & Clemens, D R. Effect of extrusion temperature on the microstructure of a powder metallurgy TiAl-based alloy. United States. https://doi.org/10.1016/S1359-6462(96)00353-3
Hsiung, L M, Nieh, T G, and Clemens, D R. 1997. "Effect of extrusion temperature on the microstructure of a powder metallurgy TiAl-based alloy". United States. https://doi.org/10.1016/S1359-6462(96)00353-3.
@article{osti_417908,
title = {Effect of extrusion temperature on the microstructure of a powder metallurgy TiAl-based alloy},
author = {Hsiung, L M and Nieh, T G and Clemens, D R},
abstractNote = {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.},
doi = {10.1016/S1359-6462(96)00353-3},
url = {https://www.osti.gov/biblio/417908}, journal = {Scripta Materialia},
number = 2,
volume = 36,
place = {United States},
year = {Wed Jan 15 00:00:00 EST 1997},
month = {Wed Jan 15 00:00:00 EST 1997}
}