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author:

Zhang, Xiangkai (Zhang, Xiangkai.) [1] (Scholars:张祥凯) | Yan, Jie (Yan, Jie.) [2] | Chen, Yen-Hsiang (Chen, Yen-Hsiang.) [3] | Kevorkyants, Ruslan (Kevorkyants, Ruslan.) [4] | Wen, Tongqi (Wen, Tongqi.) [5] | Sun, Xun (Sun, Xun.) [6] | Hu, Alice (Hu, Alice.) [7] | Huang, J. C. (Huang, J. C..) [8]

Indexed by:

EI Scopus SCIE

Abstract:

One of key factors in designing high-performance alloys is to understand their incipient behavior. To get detailed real-time atomic scale evolutions of multi-principal element alloys (MPEAs) during nanoindentation incipient yielding, molecular dynamics (MD) simulations were carried out. Emphases are given to the effects of lattice distortion (LD) and chemical short-range ordering (CSRO) on the initiation of plasticity in body-centered cubic (BCC) MPEAs. The initial plastic mechanism is embryo nucleation assisted and the incipient behavior is strongly affected by LD and CSRO. Specifically, the embryo nucleation load Pe is reduced by LD and CSRO and the incipient drop P0 is lowered by LDI that only comes from atomic size difference and further declined by CSRO. This is because LD and CSRO could boost embryo nucleation, which can act as precursors for dislocation nucleation. This is consistent with the free-end nudged elastic band observations. Although Pe is weakened by LDII generated by introducing extra elements, P0 is intensified because severe LD could dominate the following process. The dislocation starvation mechanism is found in an average-atom (AA) model. However, it is replaced by dislocation in-teractions due to LD and CSRO. Density functional theory (DFT) calculations suggest that charge density distribution and the amount of directional Al-Al bonding would play a critical role in the onset of plastic deformation. When a larger indenter radius was used in MD simulations, the dislocation starvation mechanism is absent in AA model due to the reduced maximum shear stress. Instead, the dislocation propagation prevails. With respect to the orientation effect, three investigated orientations demonstrate a distinct yielding behavior.

Keyword:

Chemical short-range ordering Incipient behavior Lattice distortion Multi -principal element alloy Nanoindentation simulations

Community:

  • [ 1 ] [Zhang, Xiangkai]Fuzhou Univ, Sch Mech Engn & Automat, Fuzhou, Peoples R China
  • [ 2 ] [Zhang, Xiangkai]City Univ Hong Kong, Hong Kong Inst Adv Study, Dept Mat Sci & Engn, Kowloon, Hong Kong, Peoples R China
  • [ 3 ] [Yan, Jie]City Univ Hong Kong, Hong Kong Inst Adv Study, Dept Mat Sci & Engn, Kowloon, Hong Kong, Peoples R China
  • [ 4 ] [Chen, Yen-Hsiang]City Univ Hong Kong, Hong Kong Inst Adv Study, Dept Mat Sci & Engn, Kowloon, Hong Kong, Peoples R China
  • [ 5 ] [Kevorkyants, Ruslan]City Univ Hong Kong, Hong Kong Inst Adv Study, Dept Mat Sci & Engn, Kowloon, Hong Kong, Peoples R China
  • [ 6 ] [Wen, Tongqi]City Univ Hong Kong, Hong Kong Inst Adv Study, Dept Mat Sci & Engn, Kowloon, Hong Kong, Peoples R China
  • [ 7 ] [Sun, Xun]City Univ Hong Kong, Hong Kong Inst Adv Study, Dept Mat Sci & Engn, Kowloon, Hong Kong, Peoples R China
  • [ 8 ] [Hu, Alice]City Univ Hong Kong, Hong Kong Inst Adv Study, Dept Mat Sci & Engn, Kowloon, Hong Kong, Peoples R China
  • [ 9 ] [Huang, J. C.]City Univ Hong Kong, Hong Kong Inst Adv Study, Dept Mat Sci & Engn, Kowloon, Hong Kong, Peoples R China
  • [ 10 ] [Huang, J. C.]Natl Sun Yat Sen Univ, Dept Mat & Optoelect Sci, Kaohsiung, Taiwan

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Source :

INTERNATIONAL JOURNAL OF PLASTICITY

ISSN: 0749-6419

Year: 2023

Volume: 166

9 . 4

JCR@2023

9 . 4 0 0

JCR@2023

ESI Discipline: ENGINEERING;

ESI HC Threshold:35

JCR Journal Grade:1

CAS Journal Grade:1

Cited Count:

WoS CC Cited Count: 0

SCOPUS Cited Count: 4

ESI Highly Cited Papers on the List: 0 Unfold All

WanFang Cited Count:

Chinese Cited Count:

30 Days PV: 1

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