An inverse Hall-Petch relation in nanocrystalline MgAl2O4 spinel consolidated by high pressure spark plasma sintering (HPSPS)
An inverse Hall-Petch relation in nanocrystalline MgAl2O4 spinel consolidated by high pressure spark plasma sintering (HPSPS)
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DOI：
10.1016/j.scriptamat.2017.06.049
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发表时间：
2017-10
影响因子：
6
通讯作者：
M. Sokol;M. Halabi;Y. Mordekovitz;S. Kalabukhov;S. Hayun;N. Frage
中科院分区：
文献类型：
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作者：
M. Sokol;M. Halabi;Y. Mordekovitz;S. Kalabukhov;S. Hayun;N. Frage
采用高压放电等离子烧结法（HPSPS）制备了晶粒尺寸小于30 nm的镁铝尖晶石透明纳米晶陶瓷，研究了陶瓷的逆Hall-Petch行为。该陶瓷由12 nm的粉末固结而成，通过溶液燃烧法合成，并在550 nm波长处显示出80%的光学透射率。试样的硬度值遵循Hall-Petch关系下降到约30 nm的晶粒尺寸，达到20 GPa的最大硬度。当晶粒尺寸减小到17 nm时，硬度值从20 GPa降低到17.6 GPa。
Inverse Hall-Petch behavior was observed in a transparent nanocrystalline magnesium aluminate spinel ceramic with grain size lower than 30 nm fabricated by high pressure spark plasma sintering (HPSPS). The ceramic was consolidated from 12 nm powder, synthesized by a solution combustion method and displayed an optical transmission of 80% at 550 nm wavelength. The hardness values of the specimens followed the Hall-Petch relation down to a grain size of about 30 nm, reaching a maximal hardness of 20 GPa. The hardness value decreased from 20 to 17.6 GPa when grain size decreased to 17 nm.