Microstructure and hardness of scandium trialuminide with ternary rare-earth additions

Yoshihisa Harada; David C. Dunand

doi:10.4028/0-87849-428-6.1565

Microstructure and hardness of scandium trialuminide with ternary rare-earth additions

Yoshihisa Harada^*, David C. Dunand

^*Corresponding author for this work

Materials Science and Engineering

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

12 Scopus citations

Abstract

The microstructure of ternary Al₃(Sc_1-yRE _y) intermetallic compounds (where RE is one of the rare-earth elements La, Ce, Nd, Sm, Eu, Yb or Lu), was investigated as a function of RE concentration for 0<y≤0.75. Alloys with La, Ce, Nd, Sm or Eu additions consist of a L1₂ phase containing a dendritic second phase with D0₁₉ (La, Ce, Nd, Sm) or C11_b (Eu) structure. Alloys with Yb or Lu additions show a single L1₂ phase. The RE solubility limits at 1373 K in the L1₂-Al₃(SC_1-yRE_y) phase are very low for La, Nd, Ce and Eu (0.08-0.41 at.% or y=0.0032-0.0164), low for Sm (3.22 at.% or y=0.1288) and complete for Yb and Lu. The lattice parameter of the L1₂ solid-solution increases linearly with RE concentration and the magnitude of this effect is correlated with the atomic size mismatch between Sc and the RE elements. The Vickers micro-hardness of the L1₂ solid-solution increases linearly with increasing RE concentration.

Original language	English (US)
Title of host publication	Supplement to THERMEC 2006, 5th International Conference on PROCESSING and MANUFACTURING OF ADVANCED MATERIALS, THERMEC 2006
Publisher	Trans Tech Publications Ltd
Pages	1565-1570
Number of pages	6
Edition	PART 2
ISBN (Print)	0878494286, 9780878494286
DOIs	https://doi.org/10.4028/0-87849-428-6.1565
State	Published - 2007
Event	5th International Conference on Processing and Manufacturing of Advanced Materials - THERMEC'2006 - Vancouver, Canada Duration: Jul 4 2006 → Jul 8 2006

Publication series

Name	Materials Science Forum
Number	PART 2
Volume	539-543
ISSN (Print)	0255-5476
ISSN (Electronic)	1662-9752

Other

Other	5th International Conference on Processing and Manufacturing of Advanced Materials - THERMEC'2006
Country/Territory	Canada
City	Vancouver
Period	7/4/06 → 7/8/06

Keywords

AlSc
Lattice parameter
Micro-hardness
Microstructure
Rare-earth
SEM/EDS
Scandium
X-ray diffraction

ASJC Scopus subject areas

General Materials Science
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

Access to Document

10.4028/0-87849-428-6.1565

Cite this

Harada, Y., & Dunand, D. C. (2007). Microstructure and hardness of scandium trialuminide with ternary rare-earth additions. In Supplement to THERMEC 2006, 5th International Conference on PROCESSING and MANUFACTURING OF ADVANCED MATERIALS, THERMEC 2006 (PART 2 ed., pp. 1565-1570). (Materials Science Forum; Vol. 539-543, No. PART 2). Trans Tech Publications Ltd. https://doi.org/10.4028/0-87849-428-6.1565

@inproceedings{320227616f5e4bee906a7ccee4be575e,

title = "Microstructure and hardness of scandium trialuminide with ternary rare-earth additions",

abstract = "The microstructure of ternary Al3(Sc1-yRE y) intermetallic compounds (where RE is one of the rare-earth elements La, Ce, Nd, Sm, Eu, Yb or Lu), was investigated as a function of RE concentration for 02 phase containing a dendritic second phase with D019 (La, Ce, Nd, Sm) or C11b (Eu) structure. Alloys with Yb or Lu additions show a single L12 phase. The RE solubility limits at 1373 K in the L12-Al3(SC1-yREy) phase are very low for La, Nd, Ce and Eu (0.08-0.41 at.% or y=0.0032-0.0164), low for Sm (3.22 at.% or y=0.1288) and complete for Yb and Lu. The lattice parameter of the L12 solid-solution increases linearly with RE concentration and the magnitude of this effect is correlated with the atomic size mismatch between Sc and the RE elements. The Vickers micro-hardness of the L12 solid-solution increases linearly with increasing RE concentration.",

keywords = "AlSc, Lattice parameter, Micro-hardness, Microstructure, Rare-earth, SEM/EDS, Scandium, X-ray diffraction",

author = "Yoshihisa Harada and Dunand, {David C.}",

note = "Copyright: Copyright 2020 Elsevier B.V., All rights reserved.; 5th International Conference on Processing and Manufacturing of Advanced Materials - THERMEC'2006 ; Conference date: 04-07-2006 Through 08-07-2006",

year = "2007",

doi = "10.4028/0-87849-428-6.1565",

language = "English (US)",

isbn = "0878494286",

series = "Materials Science Forum",

publisher = "Trans Tech Publications Ltd",

number = "PART 2",

pages = "1565--1570",

booktitle = "Supplement to THERMEC 2006, 5th International Conference on PROCESSING and MANUFACTURING OF ADVANCED MATERIALS, THERMEC 2006",

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Harada, Y & Dunand, DC 2007, Microstructure and hardness of scandium trialuminide with ternary rare-earth additions. in Supplement to THERMEC 2006, 5th International Conference on PROCESSING and MANUFACTURING OF ADVANCED MATERIALS, THERMEC 2006. PART 2 edn, Materials Science Forum, no. PART 2, vol. 539-543, Trans Tech Publications Ltd, pp. 1565-1570, 5th International Conference on Processing and Manufacturing of Advanced Materials - THERMEC'2006, Vancouver, Canada, 7/4/06. https://doi.org/10.4028/0-87849-428-6.1565

Microstructure and hardness of scandium trialuminide with ternary rare-earth additions. / Harada, Yoshihisa; Dunand, David C.
Supplement to THERMEC 2006, 5th International Conference on PROCESSING and MANUFACTURING OF ADVANCED MATERIALS, THERMEC 2006. PART 2. ed. Trans Tech Publications Ltd, 2007. p. 1565-1570 (Materials Science Forum; Vol. 539-543, No. PART 2).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

TY - GEN

T1 - Microstructure and hardness of scandium trialuminide with ternary rare-earth additions

AU - Harada, Yoshihisa

AU - Dunand, David C.

PY - 2007

Y1 - 2007

N2 - The microstructure of ternary Al3(Sc1-yRE y) intermetallic compounds (where RE is one of the rare-earth elements La, Ce, Nd, Sm, Eu, Yb or Lu), was investigated as a function of RE concentration for 02 phase containing a dendritic second phase with D019 (La, Ce, Nd, Sm) or C11b (Eu) structure. Alloys with Yb or Lu additions show a single L12 phase. The RE solubility limits at 1373 K in the L12-Al3(SC1-yREy) phase are very low for La, Nd, Ce and Eu (0.08-0.41 at.% or y=0.0032-0.0164), low for Sm (3.22 at.% or y=0.1288) and complete for Yb and Lu. The lattice parameter of the L12 solid-solution increases linearly with RE concentration and the magnitude of this effect is correlated with the atomic size mismatch between Sc and the RE elements. The Vickers micro-hardness of the L12 solid-solution increases linearly with increasing RE concentration.

AB - The microstructure of ternary Al3(Sc1-yRE y) intermetallic compounds (where RE is one of the rare-earth elements La, Ce, Nd, Sm, Eu, Yb or Lu), was investigated as a function of RE concentration for 02 phase containing a dendritic second phase with D019 (La, Ce, Nd, Sm) or C11b (Eu) structure. Alloys with Yb or Lu additions show a single L12 phase. The RE solubility limits at 1373 K in the L12-Al3(SC1-yREy) phase are very low for La, Nd, Ce and Eu (0.08-0.41 at.% or y=0.0032-0.0164), low for Sm (3.22 at.% or y=0.1288) and complete for Yb and Lu. The lattice parameter of the L12 solid-solution increases linearly with RE concentration and the magnitude of this effect is correlated with the atomic size mismatch between Sc and the RE elements. The Vickers micro-hardness of the L12 solid-solution increases linearly with increasing RE concentration.

KW - AlSc

KW - Lattice parameter

KW - Micro-hardness

KW - Microstructure

KW - Rare-earth

KW - SEM/EDS

KW - Scandium

KW - X-ray diffraction

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U2 - 10.4028/0-87849-428-6.1565

DO - 10.4028/0-87849-428-6.1565

M3 - Conference contribution

AN - SCOPUS:38349066287

SN - 0878494286

SN - 9780878494286

T3 - Materials Science Forum

SP - 1565

EP - 1570

BT - Supplement to THERMEC 2006, 5th International Conference on PROCESSING and MANUFACTURING OF ADVANCED MATERIALS, THERMEC 2006

PB - Trans Tech Publications Ltd

T2 - 5th International Conference on Processing and Manufacturing of Advanced Materials - THERMEC'2006

Y2 - 4 July 2006 through 8 July 2006

ER -

Microstructure and hardness of scandium trialuminide with ternary rare-earth additions

Abstract

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Keywords

ASJC Scopus subject areas

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