Competitive growth of nano-lamellae Nb/Nb3Si eutectics with enhanced hardness and toughness

Yueling Guo; Yao Jian Liang; Wenjun Lu; Lina Jia; Zhiming Li; Hui Peng; Hu Zhang

doi:10.1016/j.apsusc.2019.04.263

Competitive growth of nano-lamellae Nb/Nb₃Si eutectics with enhanced hardness and toughness

Yueling Guo^*, Yao Jian Liang, Wenjun Lu, Lina Jia, Zhiming Li, Hui Peng, Hu Zhang

^*Corresponding author for this work

School of Material Science and Engineering

Research output: Contribution to journal › Article › peer-review

22 Citations (Scopus)

Abstract

Here we propose to employ electron beam surface melting (EBSM)to refine microstructural length scale and obtain suited microstructure morphology of Nb-Si based alloys. As characterized by scanning transmission electron microscopy (STEM)and atom probe tomography (APT), nano-lamellar eutectics are created in Nb-20Si (at.%)alloys upon EBSM. Theoretical analysis based on the competitive growth models demonstrates the preferred formation of Nb solid solution (Nbss)/Nb₃Si eutectics under selected processing parameters. The large cooling rate during EBSM, higher than 8 × 10⁴ K/s, promotes the formation of the nano-scale eutectics. Compared to the initial coarse eutectics by arc melting, simultaneous enhancement of hardness and fracture toughness is enabled owing to the controlled microstructural length scale and morphology.

Original language	English
Pages (from-to)	22-27
Number of pages	6
Journal	Applied Surface Science
Volume	486
DOIs	https://doi.org/10.1016/j.apsusc.2019.04.263
Publication status	Published - 30 Aug 2019

Keywords

Eutectics
Fracture toughness
Nb-Si alloy
Rapid solidification
Surface melting

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10.1016/j.apsusc.2019.04.263

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title = "Competitive growth of nano-lamellae Nb/Nb3Si eutectics with enhanced hardness and toughness",

abstract = "Here we propose to employ electron beam surface melting (EBSM)to refine microstructural length scale and obtain suited microstructure morphology of Nb-Si based alloys. As characterized by scanning transmission electron microscopy (STEM)and atom probe tomography (APT), nano-lamellar eutectics are created in Nb-20Si (at.%)alloys upon EBSM. Theoretical analysis based on the competitive growth models demonstrates the preferred formation of Nb solid solution (Nbss)/Nb3Si eutectics under selected processing parameters. The large cooling rate during EBSM, higher than 8 × 104 K/s, promotes the formation of the nano-scale eutectics. Compared to the initial coarse eutectics by arc melting, simultaneous enhancement of hardness and fracture toughness is enabled owing to the controlled microstructural length scale and morphology.",

keywords = "Eutectics, Fracture toughness, Nb-Si alloy, Rapid solidification, Surface melting",

author = "Yueling Guo and Liang, {Yao Jian} and Wenjun Lu and Lina Jia and Zhiming Li and Hui Peng and Hu Zhang",

note = "Publisher Copyright: {\textcopyright} 2019 Elsevier B.V.",

year = "2019",

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doi = "10.1016/j.apsusc.2019.04.263",

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volume = "486",

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T1 - Competitive growth of nano-lamellae Nb/Nb3Si eutectics with enhanced hardness and toughness

AU - Guo, Yueling

AU - Liang, Yao Jian

AU - Lu, Wenjun

AU - Jia, Lina

AU - Li, Zhiming

AU - Peng, Hui

AU - Zhang, Hu

PY - 2019/8/30

Y1 - 2019/8/30

N2 - Here we propose to employ electron beam surface melting (EBSM)to refine microstructural length scale and obtain suited microstructure morphology of Nb-Si based alloys. As characterized by scanning transmission electron microscopy (STEM)and atom probe tomography (APT), nano-lamellar eutectics are created in Nb-20Si (at.%)alloys upon EBSM. Theoretical analysis based on the competitive growth models demonstrates the preferred formation of Nb solid solution (Nbss)/Nb3Si eutectics under selected processing parameters. The large cooling rate during EBSM, higher than 8 × 104 K/s, promotes the formation of the nano-scale eutectics. Compared to the initial coarse eutectics by arc melting, simultaneous enhancement of hardness and fracture toughness is enabled owing to the controlled microstructural length scale and morphology.

AB - Here we propose to employ electron beam surface melting (EBSM)to refine microstructural length scale and obtain suited microstructure morphology of Nb-Si based alloys. As characterized by scanning transmission electron microscopy (STEM)and atom probe tomography (APT), nano-lamellar eutectics are created in Nb-20Si (at.%)alloys upon EBSM. Theoretical analysis based on the competitive growth models demonstrates the preferred formation of Nb solid solution (Nbss)/Nb3Si eutectics under selected processing parameters. The large cooling rate during EBSM, higher than 8 × 104 K/s, promotes the formation of the nano-scale eutectics. Compared to the initial coarse eutectics by arc melting, simultaneous enhancement of hardness and fracture toughness is enabled owing to the controlled microstructural length scale and morphology.

KW - Eutectics

KW - Fracture toughness

KW - Nb-Si alloy

KW - Rapid solidification

KW - Surface melting

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DO - 10.1016/j.apsusc.2019.04.263

M3 - Article

AN - SCOPUS:85065462439

SN - 0169-4332

VL - 486

SP - 22

EP - 27

JO - Applied Surface Science

JF - Applied Surface Science

ER -

Competitive growth of nano-lamellae Nb/Nb₃Si eutectics with enhanced hardness and toughness

Abstract

Keywords

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