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

アクセス数:34件（2025-04-03 22:12 集計）

固定URL: https://hdl.handle.net/11094/98164

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タイトル
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
著者
著者名
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
著者名
Ozasa, Ryosuke
NRID
1000070314424 1000070314424
ORCID
0000-0001-9078-2541 0000-0001-9078-2541
researchmap permalink
read0158304 read0158304
Scopus Author ID
55552977400 55552977400
著者名
Sato, Kazuhisa
NRID
1000050988160 1000050988160
ORCID
0000-0002-9258-858X 0000-0002-9258-858X
Scopus Author ID
37051975500 37051975500
著者名
Gokcekaya, Ozkan
NRID
1000030243182 1000030243182
ORCID
0000-0001-8052-1698 0000-0001-8052-1698
researchmap permalink
read0013987 read0013987
Scopus Author ID
7403896013 7403896013
著者名
Nakano, Takayoshi
キーワード等
CALPHAD
Casting
Microstructure
Refractory high entropy alloys (RHEAs)
Segregation
内容
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.
抄録
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.
出版者
Elsevier Ltd
収録物名
Scripta Materialia
巻(号)
252
ページ
116260
刊行年月
2024-11-01
言語
英語
ハンドルURL
https://hdl.handle.net/11094/98164
PISSN
13596462
関連情報 (isIdenticalTo)
DOI (出版社版)
https://doi.org/10.1016/j.scriptamat.2024.116260
アクセス権
open access
権利情報
This article is licensed under a Creative Commons Attribution 4.0 International License.
出版タイプ
Version of Record
カテゴリ
学術雑誌論文 Journal Article