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Title: Undercooled rapidly solidified titanium-rare earth alloys

Abstract

The microstructural effects of undercooling on eight titanium-rare earth alloys were investigated. Electromagnetic levitation allowed cooling of the liquid well below the liquidus prior to nucleation/solidification. For each alloy, a series of samples was splat quenched with systematically varied undercoolings. The resulting materials were characterized by scanning and transmission electron microscopy in the as-quenched and annealed states. Typically, rapid solidification of titanium-rare earth alloys results in supersaturation of {alpha} Ti and precipitation occurs during annealing treatments. In these experiments, evidence of precipitation during cooling through the {beta}/{alpha} transus was observed and has been attributed to an interphase boundary precipitation mechanism. The results of undercooling/splat quench experiments were utilized to select materials for undercool/rapid quench technology (URQT) processing. This novel technique combines electromagnetic levitation, an ultrahigh (10{sup {minus}8} torr) vacuum system and a three meter drop tube with melt spinning via a variable speed copper wheel. Materials processed by this method exhibited homogeneous solidification microstructures uncharacteristic of conventional melt spinning, and small (1 nm) interphase boundary precipitates in the as-quenched state.

Authors:
; ;  [1]
  1. Vanderbilt Univ., Nashville, TN (United States). Dept. of Applied and Engineering Sciences
Publication Date:
OSTI Identifier:
186732
Report Number(s):
CONF-950201-
ISBN 0-87339-316-3; TRN: 96:007143
Resource Type:
Conference
Resource Relation:
Conference: Annual meeting and exhibition of the Minerals, Metals and Materials Society (TMS), Las Vegas, NV (United States), 12-16 Feb 1995; Other Information: PBD: 1995; Related Information: Is Part Of Synthesis/processing of lightweight metallic materials. Proceedings; Froes, F.H.; Suryanarayana, C. [eds.] [Univ. of Idaho, Moscow, ID (United States). Inst. for Materials and Advanced Processes]; Ward-Close, C.M. [ed.] [Defence Research Agency, Farnborough (United Kingdom)]; PB: 380 p.
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; TITANIUM ALLOYS; MELTING; SOLIDIFICATION; MICROSTRUCTURE; CERIUM ALLOYS; ERBIUM ALLOYS; LANTHANUM ALLOYS; YTTRIUM ALLOYS; LEVITATION; QUENCHING; LIQUID METALS; HELIUM; ULTRAHIGH VACUUM; OPTICAL PYROMETERS; ANNEALING; SCANNING ELECTRON MICROSCOPY; TRANSMISSION ELECTRON MICROSCOPY; OPTICAL MICROSCOPY; PRECIPITATION; MORPHOLOGY

Citation Formats

Kral, M V, Hofmeister, W H, and Wittig, J E. Undercooled rapidly solidified titanium-rare earth alloys. United States: N. p., 1995. Web.
Kral, M V, Hofmeister, W H, & Wittig, J E. Undercooled rapidly solidified titanium-rare earth alloys. United States.
Kral, M V, Hofmeister, W H, and Wittig, J E. 1995. "Undercooled rapidly solidified titanium-rare earth alloys". United States.
@article{osti_186732,
title = {Undercooled rapidly solidified titanium-rare earth alloys},
author = {Kral, M V and Hofmeister, W H and Wittig, J E},
abstractNote = {The microstructural effects of undercooling on eight titanium-rare earth alloys were investigated. Electromagnetic levitation allowed cooling of the liquid well below the liquidus prior to nucleation/solidification. For each alloy, a series of samples was splat quenched with systematically varied undercoolings. The resulting materials were characterized by scanning and transmission electron microscopy in the as-quenched and annealed states. Typically, rapid solidification of titanium-rare earth alloys results in supersaturation of {alpha} Ti and precipitation occurs during annealing treatments. In these experiments, evidence of precipitation during cooling through the {beta}/{alpha} transus was observed and has been attributed to an interphase boundary precipitation mechanism. The results of undercooling/splat quench experiments were utilized to select materials for undercool/rapid quench technology (URQT) processing. This novel technique combines electromagnetic levitation, an ultrahigh (10{sup {minus}8} torr) vacuum system and a three meter drop tube with melt spinning via a variable speed copper wheel. Materials processed by this method exhibited homogeneous solidification microstructures uncharacteristic of conventional melt spinning, and small (1 nm) interphase boundary precipitates in the as-quenched state.},
doi = {},
url = {https://www.osti.gov/biblio/186732}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Sun Dec 31 00:00:00 EST 1995},
month = {Sun Dec 31 00:00:00 EST 1995}
}

Conference:
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