Microstructural characterization of nanostructured Al                         2                         O                         3                         -ZrO                         2                          eutectic layer by laser rapid solidification method

Zhi Gang Wang; Jia Hu Ouyang; Yu Jin Wang; Ling Yun Xie; Yong Hui Ma; Zhan Guo Liu; Abdelkhalek Henniche; Yang Wang

doi:10.1016/j.apsusc.2019.01.096

Microstructural characterization of nanostructured Al ₂ O ₃ -ZrO ₂ eutectic layer by laser rapid solidification method

Zhi Gang Wang
, Jia Hu Ouyang^*
, Yu Jin Wang
, Ling Yun Xie
, Yong Hui Ma
, Zhan Guo Liu
, Abdelkhalek Henniche
, Yang Wang

^*Corresponding author for this work

School of Materials Science and Engineering

Harbin Institute of Technology
School of Mechatronics Engineering, Harbin Institute of Technology

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

22 Scopus citations

Abstract

In the present work, nanostructured surface layers of Al ₂ O ₃ -ZrO ₂ eutectic with a thickness of approximate 1000 μm and free of cracks and pores were produced on the surface of conventionally-sintered Al ₂ O ₃ -ZrO ₂ ceramic via the laser irradiation rapid solidification process. The molten pool geometry and microstructure were characterized by scanning electron microscopy and Raman spectroscopy. The geometrical evolution of molten pool in response to laser power and laser scanning velocity was established, where the top view of molten pool exhibits a circular shape at low velocities and gradually evolves into an oval-shaped surface at high velocities. Singular Al ₂ O ₃ -ZrO ₂ eutectic colonies with a size of 100–200 μm, which is formed around a spontaneously nucleated dendritic ZrO ₂ core, are found on the surface of laser-remelted layer. The eutectic colony has an interphase spacing of 190–280 nm. The variation of eutectic spacing with growth rate is essentially linear on the logarithmic scale as λ=KV ^-0.4 by binary regression analysis. Predicted by the Jackson-Hunt theory on eutectic solidification (JH theory), the eutectic spacing is consistent with the inverse-square-root dependence on growth rate with a proportionality constant of 3.32. The eutectic colonies consist of α-Al ₂ O ₃ , t-ZrO ₂ and m-ZrO ₂ phases, where α-Al ₂ O ₃ and t-ZrO ₂ are the dominant phases and the m-ZrO ₂ phase increases with the decrease of laser scanning velocity.

Original language	English
Pages (from-to)	335-341
Number of pages	7
Journal	Applied Surface Science
Volume	476
DOIs	https://doi.org/10.1016/j.apsusc.2019.01.096
State	Published - 15 May 2019

Keywords

Al O -ZrO
Laser remelting
Nanoeutectic layer
Surface nanostructuring

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10.1016/j.apsusc.2019.01.096

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Wang, Z. G., Ouyang, J. H., Wang, Y. J., Xie, L. Y., Ma, Y. H., Liu, Z. G., Henniche, A., & Wang, Y. (2019). Microstructural characterization of nanostructured Al ₂ O ₃ -ZrO ₂ eutectic layer by laser rapid solidification method Applied Surface Science, 476, 335-341. https://doi.org/10.1016/j.apsusc.2019.01.096

Wang, Zhi Gang ; Ouyang, Jia Hu ; Wang, Yu Jin et al. / Microstructural characterization of nanostructured Al ₂ O ₃ -ZrO ₂ eutectic layer by laser rapid solidification method In: Applied Surface Science. 2019 ; Vol. 476. pp. 335-341.

@article{c9f45e02741447d2b23f351b2a1afdac,

title = " Microstructural characterization of nanostructured Al 2 O 3 -ZrO 2 eutectic layer by laser rapid solidification method ",

abstract = " In the present work, nanostructured surface layers of Al 2 O 3 -ZrO 2 eutectic with a thickness of approximate 1000 μm and free of cracks and pores were produced on the surface of conventionally-sintered Al 2 O 3 -ZrO 2 ceramic via the laser irradiation rapid solidification process. The molten pool geometry and microstructure were characterized by scanning electron microscopy and Raman spectroscopy. The geometrical evolution of molten pool in response to laser power and laser scanning velocity was established, where the top view of molten pool exhibits a circular shape at low velocities and gradually evolves into an oval-shaped surface at high velocities. Singular Al 2 O 3 -ZrO 2 eutectic colonies with a size of 100–200 μm, which is formed around a spontaneously nucleated dendritic ZrO 2 core, are found on the surface of laser-remelted layer. The eutectic colony has an interphase spacing of 190–280 nm. The variation of eutectic spacing with growth rate is essentially linear on the logarithmic scale as λ=KV -0.4 by binary regression analysis. Predicted by the Jackson-Hunt theory on eutectic solidification (JH theory), the eutectic spacing is consistent with the inverse-square-root dependence on growth rate with a proportionality constant of 3.32. The eutectic colonies consist of α-Al 2 O 3 , t-ZrO 2 and m-ZrO 2 phases, where α-Al 2 O 3 and t-ZrO 2 are the dominant phases and the m-ZrO 2 phase increases with the decrease of laser scanning velocity.",

keywords = "Al O -ZrO, Laser remelting, Nanoeutectic layer, Surface nanostructuring",

author = "Wang, \{Zhi Gang\} and Ouyang, \{Jia Hu\} and Wang, \{Yu Jin\} and Xie, \{Ling Yun\} and Ma, \{Yong Hui\} and Liu, \{Zhan Guo\} and Abdelkhalek Henniche and Yang Wang",

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

year = "2019",

month = may,

day = "15",

doi = "10.1016/j.apsusc.2019.01.096",

language = "英语",

volume = "476",

pages = "335--341",

journal = "Applied Surface Science",

issn = "0169-4332",

publisher = "Elsevier B.V.",

}

Wang, ZG, Ouyang, JH , Wang, YJ, Xie, LY, Ma, YH, Liu, ZG, Henniche, A & Wang, Y 2019, ' Microstructural characterization of nanostructured Al ₂ O ₃ -ZrO ₂ eutectic layer by laser rapid solidification method ', Applied Surface Science, vol. 476, pp. 335-341. https://doi.org/10.1016/j.apsusc.2019.01.096

Microstructural characterization of nanostructured Al ₂ O ₃ -ZrO ₂ eutectic layer by laser rapid solidification method . / Wang, Zhi Gang; Ouyang, Jia Hu ; Wang, Yu Jin et al.
In: Applied Surface Science, Vol. 476, 15.05.2019, p. 335-341.

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

TY - JOUR

T1 - Microstructural characterization of nanostructured Al 2 O 3 -ZrO 2 eutectic layer by laser rapid solidification method

AU - Wang, Zhi Gang

AU - Ouyang, Jia Hu

AU - Wang, Yu Jin

AU - Xie, Ling Yun

AU - Ma, Yong Hui

AU - Liu, Zhan Guo

AU - Henniche, Abdelkhalek

AU - Wang, Yang

PY - 2019/5/15

Y1 - 2019/5/15

N2 - In the present work, nanostructured surface layers of Al 2 O 3 -ZrO 2 eutectic with a thickness of approximate 1000 μm and free of cracks and pores were produced on the surface of conventionally-sintered Al 2 O 3 -ZrO 2 ceramic via the laser irradiation rapid solidification process. The molten pool geometry and microstructure were characterized by scanning electron microscopy and Raman spectroscopy. The geometrical evolution of molten pool in response to laser power and laser scanning velocity was established, where the top view of molten pool exhibits a circular shape at low velocities and gradually evolves into an oval-shaped surface at high velocities. Singular Al 2 O 3 -ZrO 2 eutectic colonies with a size of 100–200 μm, which is formed around a spontaneously nucleated dendritic ZrO 2 core, are found on the surface of laser-remelted layer. The eutectic colony has an interphase spacing of 190–280 nm. The variation of eutectic spacing with growth rate is essentially linear on the logarithmic scale as λ=KV -0.4 by binary regression analysis. Predicted by the Jackson-Hunt theory on eutectic solidification (JH theory), the eutectic spacing is consistent with the inverse-square-root dependence on growth rate with a proportionality constant of 3.32. The eutectic colonies consist of α-Al 2 O 3 , t-ZrO 2 and m-ZrO 2 phases, where α-Al 2 O 3 and t-ZrO 2 are the dominant phases and the m-ZrO 2 phase increases with the decrease of laser scanning velocity.

AB - In the present work, nanostructured surface layers of Al 2 O 3 -ZrO 2 eutectic with a thickness of approximate 1000 μm and free of cracks and pores were produced on the surface of conventionally-sintered Al 2 O 3 -ZrO 2 ceramic via the laser irradiation rapid solidification process. The molten pool geometry and microstructure were characterized by scanning electron microscopy and Raman spectroscopy. The geometrical evolution of molten pool in response to laser power and laser scanning velocity was established, where the top view of molten pool exhibits a circular shape at low velocities and gradually evolves into an oval-shaped surface at high velocities. Singular Al 2 O 3 -ZrO 2 eutectic colonies with a size of 100–200 μm, which is formed around a spontaneously nucleated dendritic ZrO 2 core, are found on the surface of laser-remelted layer. The eutectic colony has an interphase spacing of 190–280 nm. The variation of eutectic spacing with growth rate is essentially linear on the logarithmic scale as λ=KV -0.4 by binary regression analysis. Predicted by the Jackson-Hunt theory on eutectic solidification (JH theory), the eutectic spacing is consistent with the inverse-square-root dependence on growth rate with a proportionality constant of 3.32. The eutectic colonies consist of α-Al 2 O 3 , t-ZrO 2 and m-ZrO 2 phases, where α-Al 2 O 3 and t-ZrO 2 are the dominant phases and the m-ZrO 2 phase increases with the decrease of laser scanning velocity.

KW - Al O -ZrO

KW - Laser remelting

KW - Nanoeutectic layer

KW - Surface nanostructuring

UR - https://www.scopus.com/pages/publications/85060088231

U2 - 10.1016/j.apsusc.2019.01.096

DO - 10.1016/j.apsusc.2019.01.096

M3 - 文章

AN - SCOPUS:85060088231

SN - 0169-4332

VL - 476

SP - 335

EP - 341

JO - Applied Surface Science

JF - Applied Surface Science

ER -

Wang ZG, Ouyang JH , Wang YJ, Xie LY, Ma YH, Liu ZG et al. Microstructural characterization of nanostructured Al ₂ O ₃ -ZrO ₂ eutectic layer by laser rapid solidification method Applied Surface Science. 2019 May 15;476:335-341. doi: 10.1016/j.apsusc.2019.01.096

Microstructural characterization of nanostructured Al ₂ O ₃ -ZrO ₂ eutectic layer by laser rapid solidification method

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