Detailed Information

Cited 0 time in webofscience Cited 0 time in scopus
Metadata Downloads

The influence of chemical short-range order on the nanoindentation properties of high-entropy alloys prepared via laser powder bed fusion

Authors
Guo, ShuaiWang, MengWang, QianSui, ShangKayani, Saif HaiderSeole, Jae BokZhu, PengchengGuo, AnfuLin, XinHuang, Weidong
Issue Date
Jan-2024
Publisher
Elsevier Inc.
Keywords
Additive manufacturing; Chemical short-range order; High-entropy alloy; Mechanical properties
Citation
Materials Characterization, v.207
Indexed
SCOPUS
Journal Title
Materials Characterization
Volume
207
URI
https://scholarworks.gnu.ac.kr/handle/sw.gnu/69043
DOI
10.1016/j.matchar.2023.113560
ISSN
1044-5803
1873-4189
Abstract
Chemical short-range order (CSRO) plays an instrumental role in determining the mechanical properties of high-entropy alloys (HEAs). Current methods for controlling CSRO mainly focus on cast HEAs, which can not solve the problem of grain coarsening caused by homogenization treatments. Laser Powder Bed Fusion (LPBF), which has extremely high cooling rates, can suppress compositional segregation, refine grain structures, and achieve low CSRO. This offers a promising avenue for quantitatively controlling CSRO without the need for homogenization treatments. In this study, we investigate the CSRO of HEAs fabricated via LPBF and elucidate their influence on nanoindentation behavior. The results show that, at the low cooling rate, the average size of CSRO is 0.66 nm and they occupy 2.8% of the cross-sectional area, while at high cooling rate, the corresponding values are 0.92 nm and 9.9%, respectively, both of which are significantly smaller than those of cast HEAs. By analyzing samples with different CSROs, we observe that the hardness increases and then decreases with the increase of CSRO, primarily due to the preferential formation of dislocations in regions enriched with Cr-Mn-Ni. With the improvement of CSRO, both the size and quantity of Cr-Mn-Ni rich region gradually increased; subsequently, as multiple Cr-Mn-Ni rich regions tend to merge into one during the CSRO improvement, the size of the Cr-Mn-Ni rich region continued to increase while the quantity gradually decreased; when the size of the Cr-Mn-Ni rich region is moderate and widely dispersed, the dislocation density is higher with much more uniform distributions, which favorably improves nanoindentation hardness. © 2023 Elsevier Inc.
Files in This Item
There are no files associated with this item.
Appears in
Collections
공학계열 > Dept.of Materials Engineering and Convergence Technology > Journal Articles

qrcode

Items in ScholarWorks are protected by copyright, with all rights reserved, unless otherwise indicated.

Related Researcher

Researcher Seol, Jae Bok photo

Seol, Jae Bok
대학원 (나노신소재융합공학과)
Read more

Altmetrics

Total Views & Downloads

BROWSE