Design and development of a novel non-equiatomic Ti-Nb-Mo-Ta-W refractory high entropy alloy with a single-phase body-centered cubic structure

Kim, Yong Seong; Ozasa, Ryosuke; Sato, Kazuhisa et al.

Scripta Materialia, 2024, 252, 116260

Number of Access:601（2025-08-14 01:18 Counts）

Identifier to cite or link to this item: https://hdl.handle.net/11094/98164

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Title
Design and development of a novel non-equiatomic Ti-Nb-Mo-Ta-W refractory high entropy alloy with a single-phase body-centered cubic structure
Creator
CreatorName
Kim, Yong Seong
NRID
1000080845347 1000080845347
ORCID
0000-0002-2773-072X 0000-0002-2773-072X
researchmap permalink
ozasa_r ozasa_r
Scopus Author ID
56202812400 56202812400
CreatorName
Ozasa, Ryosuke
NRID
1000070314424 1000070314424
ORCID
0000-0001-9078-2541 0000-0001-9078-2541
researchmap permalink
read0158304 read0158304
Scopus Author ID
55552977400 55552977400
CreatorName
Sato, Kazuhisa
NRID
1000050988160 1000050988160
ORCID
0000-0002-9258-858X 0000-0002-9258-858X
Scopus Author ID
37051975500 37051975500
CreatorName
Gokcekaya, Ozkan
NRID
1000030243182 1000030243182
ORCID
0000-0001-8052-1698 0000-0001-8052-1698
researchmap permalink
read0013987 read0013987
Scopus Author ID
7403896013 7403896013
CreatorName
Nakano, Takayoshi
Subject
CALPHAD
Casting
Microstructure
Refractory high entropy alloys (RHEAs)
Segregation
Description
Kim Y.S., Ozasa R., Sato K., et al. Design and development of a novel non-equiatomic Ti-Nb-Mo-Ta-W refractory high entropy alloy with a single-phase body-centered cubic structure. Scripta Materialia 252, 116260 (2024); https://doi.org/10.1016/j.scriptamat.2024.116260.
Abstract
Element segregation and consequent phase separation are challenging problems in refractory high entropy alloys (RHEAs). In this study, thermodynamic parameters and calculation of phase diagrams (CALPHAD) were implemented for RHEA design to suppress segregation and phase separation. A novel non-equiatomic RHEA, Ti1(NbMoTa)2W0.5 alloy, was designed with a minimized difference between liquidus and solidus temperatures (ΔTl−s) and a wide temperature range between solidus temperature and transformation temperature (ΔTsingle) and compared with equiatomic RHEA. As-cast Ti1(NbMoTa)2W0.5 alloy maintained a single-phase body-centered cubic (BCC) structure, corresponding to the Scheil–Gulliver model, and segregation of constituent elements was suppressed owing to the minimized ΔTl−s. Ti1(NbMoTa)2W0.5 alloy showed excellent strength (approximately 1100 MPa) and ductility (1.6 times higher than TiNbMoTaW alloy). This study demonstrated a novel approach for obtaining single-phase BCC-structured RHEAs with suppressed elemental segregation and phase separation by utilizing combined use of ΔTl−s and ΔTsingle as alloy design indexes.
Publisher
Elsevier Ltd
Source Title
Scripta Materialia
Volume (Issue)
252
Page
116260
Date of Issued
2024-11-01
Language
English
Handle URL
https://hdl.handle.net/11094/98164
PISSN
13596462
Relation.isIdenticalTo
DOI (Publisher Version)
https://doi.org/10.1016/j.scriptamat.2024.116260
Access Rights
open access
CopyRight
This article is licensed under a Creative Commons Attribution 4.0 International License.
oaire:version
Version of Record
Category
学術雑誌論文 Journal Article