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Title: Pseudo-binary phase diagram for Zr-based in-situ beta phase composites.

Abstract

The pseudo-binary (quasi-equilibrium) phase diagram for Zr-based bulk metallic glasses with crystalline in situ precipitates ({beta} phase) has been constructed from high-temperature phase information and chemical composition analysis. The phase evolution was detected in situ by high-energy synchrotron x-ray diffraction followed by Rietveld analysis of the data for volume fraction estimation. The phase diagram delineates phase fields and allows the control of phase fractions. Combined with related previous work by the authors, this diagram offers a unique opportunity to control both the morphology and volume of the dendritic {beta} phase precipitates to enhance the properties of the composites.

Authors:
; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
962548
Report Number(s):
ANL/XSD/JA-58269
Journal ID: ISSN 0884-2914; JMREEE; TRN: US0902884
DOE Contract Number:
DE-AC02-06CH11357
Resource Type:
Journal Article
Resource Relation:
Journal Name: J. Mater. Res.; Journal Volume: 22; Journal Issue: 2 ; 2007
Country of Publication:
United States
Language:
ENGLISH
Subject:
36 MATERIALS SCIENCE; 43 PARTICLE ACCELERATORS; CHEMICAL COMPOSITION; METALLIC GLASSES; MORPHOLOGY; PHASE DIAGRAMS; SYNCHROTRONS; X-RAY DIFFRACTION

Citation Formats

Lee, S. Y., Ustundag, E., Almer, J. D., Lienert, U., Kim, C. P., Johnson, W. L., X-Ray Science Division, Iowa State Univ., and California Inst. Of Tech. Pseudo-binary phase diagram for Zr-based in-situ beta phase composites.. United States: N. p., 2007. Web. doi:10.1557/jmr.2007.0066.
Lee, S. Y., Ustundag, E., Almer, J. D., Lienert, U., Kim, C. P., Johnson, W. L., X-Ray Science Division, Iowa State Univ., & California Inst. Of Tech. Pseudo-binary phase diagram for Zr-based in-situ beta phase composites.. United States. doi:10.1557/jmr.2007.0066.
Lee, S. Y., Ustundag, E., Almer, J. D., Lienert, U., Kim, C. P., Johnson, W. L., X-Ray Science Division, Iowa State Univ., and California Inst. Of Tech. Mon . "Pseudo-binary phase diagram for Zr-based in-situ beta phase composites.". United States. doi:10.1557/jmr.2007.0066.
@article{osti_962548,
title = {Pseudo-binary phase diagram for Zr-based in-situ beta phase composites.},
author = {Lee, S. Y. and Ustundag, E. and Almer, J. D. and Lienert, U. and Kim, C. P. and Johnson, W. L. and X-Ray Science Division and Iowa State Univ. and California Inst. Of Tech.},
abstractNote = {The pseudo-binary (quasi-equilibrium) phase diagram for Zr-based bulk metallic glasses with crystalline in situ precipitates ({beta} phase) has been constructed from high-temperature phase information and chemical composition analysis. The phase evolution was detected in situ by high-energy synchrotron x-ray diffraction followed by Rietveld analysis of the data for volume fraction estimation. The phase diagram delineates phase fields and allows the control of phase fractions. Combined with related previous work by the authors, this diagram offers a unique opportunity to control both the morphology and volume of the dendritic {beta} phase precipitates to enhance the properties of the composites.},
doi = {10.1557/jmr.2007.0066},
journal = {J. Mater. Res.},
number = 2 ; 2007,
volume = 22,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}
  • The phase diagram of the pseudo-binary CrB-FeB system was studied in the temperature range from 900 to 2200/sup 0/C by using a piston-cylinder high pressure apparatus as a reaction vessel. The CrB-type phase was found to be unstable relative to the FeB-type phase at higher temperature. The magnetism and thermal expansion of the samples having the FeB-type structure were also studied in connection with their Invar properties.
  • The pseudo-binary phase diagram between Y{sub 0.5}Nd{sub 0.5}Ba{sub 2}Cu{sub 3}O{sub x} and Ba{sub 3}Cu{sub 10}O{sup 13} has been in-situ observed using high-temperature optical microscopy. It has been observed that the liquidus line is very narrow both in composition and temperature, which suggested that Y{sub 0.5}Nd{sub 0.5}Ba{sub 2}Cu{sub 3}O{sub x} crystals could only be grown from a peritectic melt consisting of (Y{sub 0.5}Nd{sub 0.5}){sub 2}BaCuO{sub 5} and a liquid. The crystal growth of Y{sub 0.5}Nd{sub 0.5}Ba{sub 2}Cu{sub 3}O{sub x} was performed in a tubular furnace under a horizontal temperature gradient using alumina crucibles. Well faceted Y{sub 0.5}Nd{sub 0.5}Ba{sub 2}Cu{sub 3}O{sub x}more » crystals up to a size of 7.3 x 5.8 x 1.28 mm{sup 3} were grown.« less
  • No abstract prepared.
  • The high-pressure behavior of zirconium has been examined using the synchrotron X-ray diffraction technique to a pressure of 38 GPa and a temperature of 800 K employing a hydrothermal diamond anvil cell technique. The structural transition from the ω to the β phase was observed. This transition has a negative dP/dT gradient, which is in general agreement with those reported in previous studies. The transition boundary was determined to be, P (GPa)=41.2–0.025×T (K). The negative slope of the transition, dP/dT, determined in our study using the diamond anvil cell technique was less than half that estimated by the previous studymore » using a large press apparatus. - Graphical abstract: Experimental results and phase boundary of the ω–β transition in Zr. - Highlights: • X-ray diffraction patterns of zirconium were measured by the synchrotron experiments. • High-pressure experiments were performed by an external-heated diamond anvil cell. • Phase diagram of zirconium was determined at high pressures and high temperatures. • Phase boundary between omega and beta transition has a negative dP/dT slope.« less