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Title: Processing of a Nb{sub 3}Al-Ti ternary alloy from elemental and prealloyed powders

Abstract

Niobium aluminides offer the advantage of higher high temperature capability compared to other intermetallic aluminides due to the refractory nature of niobium. However, the reaction sequence in Nb-Al system is sluggish and currently there is a great interest in the processing aspects of these materials. In the present study, a systematic investigation was undertaken to compare the effect of different powder metallurgy processing routes on the phase relations and microstructure of 66Nb-22Al-12Ti (in atom percent) alloy. The three different process routes adopted were: (1) cold pressing followed by reaction sintering; (2) cold pressing and hot pressing followed by sintering; and (3) arc melting, hydride-dehydride process to make the alloy powder followed by cold pressing and then sintering. The samples are analyzed by XRD, Optical Microscopy, SEM-EDS and EPMA. The analysis showed that alloy pellets made from pre-alloyed powders i.e., arc melting followed by hydride-dehydride process, gave good densification and more Nb{sub 3}Al formation.

Authors:
;  [1]
  1. Univ. of Nevada, Reno, NV (United States). Dept. of Chemical and Metallurgical Engineering
Publication Date:
OSTI Identifier:
367626
Report Number(s):
CONF-960202-
ISBN 0-87339-310-4; TRN: IM9640%%372
Resource Type:
Book
Resource Relation:
Conference: Annual meeting and exhibition of the Minerals, Metals and Materials Society (TMS), Anaheim, CA (United States), 4-8 Feb 1996; Other Information: PBD: 1996; Related Information: Is Part Of Design fundamentals of high temperature composites, intermetallics, and metal-ceramics systems; Lin, R.Y. [ed.] [Univ. of Cincinnati, OH (United States). Dept. of Materials Science and Engineering]; Chang, Y.A. [ed.] [Univ. of Wisconsin, Madison, WI (United States). Dept. of Materials Science and Engineering]; Reddy, R.G. [ed.] [Univ. of Nevada, Reno, NV (United States). Dept. of Chemical and Metallurgical Engineering]; Liu, C.T. [ed.] [Oak Ridge National Lab., TN (United States). Metals and Ceramics Div.]; PB: 461 p.
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; NIOBIUM BASE ALLOYS; MICROSTRUCTURE; PHASE STUDIES; POWDER METALLURGY; ALUMINIUM ALLOYS; TITANIUM ALLOYS; HEAT RESISTING ALLOYS; INTERMETALLIC COMPOUNDS; X-RAY DIFFRACTION; ELECTRON MICROSCOPY; EXPERIMENTAL DATA

Citation Formats

Kumar, S G, and Reddy, R G. Processing of a Nb{sub 3}Al-Ti ternary alloy from elemental and prealloyed powders. United States: N. p., 1996. Web.
Kumar, S G, & Reddy, R G. Processing of a Nb{sub 3}Al-Ti ternary alloy from elemental and prealloyed powders. United States.
Kumar, S G, and Reddy, R G. 1996. "Processing of a Nb{sub 3}Al-Ti ternary alloy from elemental and prealloyed powders". United States.
@article{osti_367626,
title = {Processing of a Nb{sub 3}Al-Ti ternary alloy from elemental and prealloyed powders},
author = {Kumar, S G and Reddy, R G},
abstractNote = {Niobium aluminides offer the advantage of higher high temperature capability compared to other intermetallic aluminides due to the refractory nature of niobium. However, the reaction sequence in Nb-Al system is sluggish and currently there is a great interest in the processing aspects of these materials. In the present study, a systematic investigation was undertaken to compare the effect of different powder metallurgy processing routes on the phase relations and microstructure of 66Nb-22Al-12Ti (in atom percent) alloy. The three different process routes adopted were: (1) cold pressing followed by reaction sintering; (2) cold pressing and hot pressing followed by sintering; and (3) arc melting, hydride-dehydride process to make the alloy powder followed by cold pressing and then sintering. The samples are analyzed by XRD, Optical Microscopy, SEM-EDS and EPMA. The analysis showed that alloy pellets made from pre-alloyed powders i.e., arc melting followed by hydride-dehydride process, gave good densification and more Nb{sub 3}Al formation.},
doi = {},
url = {https://www.osti.gov/biblio/367626}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Oct 01 00:00:00 EDT 1996},
month = {Tue Oct 01 00:00:00 EDT 1996}
}

Book:
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