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Title: Reduced electronegativity difference as a factor leading to the formation of Al-based glassy alloys with a large supercooled liquid region of 50 K

Abstract

The influence of the electronegativity difference among the constituent elements on the stability of the supercooled liquid in two Al-based glassy alloys is studied. A record-large value of the supercooled liquid region of about 50 K is obtained based on the electronegativity difference concept within a certain composition range.

Authors:
; ;  [1];  [2]
  1. Institute for Materials Research, Tohoku University, Katahira 2-1-1, Aoba-Ku, Sendai 980-8577 (Japan)
  2. (Brazil)
Publication Date:
OSTI Identifier:
20778518
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 88; Journal Issue: 1; Other Information: DOI: 10.1063/1.2159420; (c) 2006 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ALUMINIUM BASE ALLOYS; ELECTRONEGATIVITY; LIQUIDS; METALLIC GLASSES; TEMPERATURE DEPENDENCE; TEMPERATURE RANGE 0013-0065 K; VITRIFICATION

Citation Formats

Louzguine-Luzgin, Dmitri V., Inoue, Akihisa, Botta, Walter Jose, and Department of Materials Eng, Federal University of Sao Carlos, c.p. 676, 13565-090 Sao Carlos, SP. Reduced electronegativity difference as a factor leading to the formation of Al-based glassy alloys with a large supercooled liquid region of 50 K. United States: N. p., 2006. Web. doi:10.1063/1.2159420.
Louzguine-Luzgin, Dmitri V., Inoue, Akihisa, Botta, Walter Jose, & Department of Materials Eng, Federal University of Sao Carlos, c.p. 676, 13565-090 Sao Carlos, SP. Reduced electronegativity difference as a factor leading to the formation of Al-based glassy alloys with a large supercooled liquid region of 50 K. United States. doi:10.1063/1.2159420.
Louzguine-Luzgin, Dmitri V., Inoue, Akihisa, Botta, Walter Jose, and Department of Materials Eng, Federal University of Sao Carlos, c.p. 676, 13565-090 Sao Carlos, SP. Mon . "Reduced electronegativity difference as a factor leading to the formation of Al-based glassy alloys with a large supercooled liquid region of 50 K". United States. doi:10.1063/1.2159420.
@article{osti_20778518,
title = {Reduced electronegativity difference as a factor leading to the formation of Al-based glassy alloys with a large supercooled liquid region of 50 K},
author = {Louzguine-Luzgin, Dmitri V. and Inoue, Akihisa and Botta, Walter Jose and Department of Materials Eng, Federal University of Sao Carlos, c.p. 676, 13565-090 Sao Carlos, SP},
abstractNote = {The influence of the electronegativity difference among the constituent elements on the stability of the supercooled liquid in two Al-based glassy alloys is studied. A record-large value of the supercooled liquid region of about 50 K is obtained based on the electronegativity difference concept within a certain composition range.},
doi = {10.1063/1.2159420},
journal = {Applied Physics Letters},
number = 1,
volume = 88,
place = {United States},
year = {Mon Jan 02 00:00:00 EST 2006},
month = {Mon Jan 02 00:00:00 EST 2006}
}
  • The oxidation behavior of {gamma}-TiAl and {alpha}{sub 2}-Ti{sub 3}Al + {gamma}-TiAl alloys was studied at 1,000 C in pure oxygen up to 250 h. All alloy coupons were polished to a 1 {micro}m finish prior to oxidation. A series of {gamma}-Ti{sub 48}Al{sub 52} coupons polished to a 600-grit finish were also prepared. The type of scale which formed during oxidation and the consequent subsurface changes in the alloy were found to depend on the presence and amount of {alpha}{sub 2} in the starting alloy microstructure, surface finish, and oxidation time. The {gamma}-alloy with a 600-grit finish formed a protective Al{submore » 2}O{sub 3}-rich scale during the early stages of oxidation, whereas the same alloy with a 1 {micro}m finish formed a less protective Al{sub 2}O{sub 3} + TiO{sub 2} scale. In the former case, a continuous subsurface layer of Z-Ti{sub 50}Al{sub 30}O{sub 20} formed from {gamma} by essentially equal amounts of oxygen enrichment and aluminum depletion; essentially no titanium diffusion was required. With continued oxidation, the continuous Z-layer destabilized at the Z/{gamma} interface into a mixture of {alpha}{sub 2}(O) + Z. The presence of {alpha}{sub 2}(O) + Z in the subsurface zone always corresponded to the growth of a non-protective Al{sub 2}O{sub 3} + TiO{sub 2} scale, suggesting that {alpha}{sub 2}(O) precipitation initiates the breakdown of the initially formed Al{sub 2}O{sub 3}-rich scale. The subsurface zone in the {gamma} alloy with a 1 {micro}m finish varied, containing either internal Al{sub 2}O{sub 3} and no Z phase or {alpha}{sub 2}(O) + Z. The {alpha}{sub 2} + {gamma} alloys formed a non-protective Al{sub 2}O{sub 3} + TiO{sub 2} scale and subsurface zone of {alpha}{sub 2}(O) + Z at all the times studied. The discontinuous distribution of {gamma} in the two-phase alloys prevented formation of a continuous Z layer. The Z phase was determined to be metastable on the basis of equilibration experiments with Ti-Al-O alloys.« less
  • Results of calorimetric, differential thermal analysis, and structural measurements are presented for a series of bulk metallic glass forming compositions in the Zr[endash]Ti[endash]Cu[endash]Ni[endash]Be alloy system. The calorimetric data for five alloys, prepared along the tie line between phase separating and nonphase separating compositions, show that the transition from phase separating to nonphase separating behavior is smooth. The bulk glasses near the center of the tie line exhibit large supercooled liquid regions: [Delta]T[approx]135 K, the largest known for a bulk metallic glass. [copyright] [ital 1999 American Institute of Physics.]
  • Results of calorimetric, differential thermal analysis, and structural measurements are presented for a series of bulk metallic glass forming compositions in the Zr{endash}Ti{endash}Cu{endash}Ni{endash}Be alloy system. The calorimetric data for five alloys, prepared along the tie line between phase separating and nonphase separating compositions, show that the transition from phase separating to nonphase separating behavior is smooth. The bulk glasses near the center of the tie line exhibit large supercooled liquid regions: {Delta}T{approx}135 K, the largest known for a bulk metallic glass. {copyright} {ital 1999 American Institute of Physics.}
  • The effect of stress states on the deformation behavior of the Cu54Zr22Ti18Ni6 bulk metallic glass (BMG) alloy was studied in the supercooled liquid region. At 723 K, Newtonian plastic flow governed the deformation during the compression test, whereas strain-hardening occurred during the tensile test. At 733 K, a fast failure was observed during tensile test. The diffusion rate of Cu atoms in the BMG alloy plays an important role in the deformation behavior. The fast diffusion of Cu atoms under the tensile stress state caused faster crystallization leading to a fast strain-hardening during the tensile plastic deformation. Published by Elseviermore » B.V.« less