The effect of submicron grain size on thermal stability and mechanical properties of high-entropy carbide ceramics

被引：135

作者：

Wang, Fei ^{[1
]}

Zhang, Xiang ^{[1
]}

Yan, Xueliang ^{[1
]}

Lu, Yongfeng ^{[2
]}

Nastasi, Michael ^{[1
,3
,4
]}

Chen, Yan ^{[5
]}

Cui, Bai ^{[1
,4
]}

机构：

[1] Univ Nebraska, Dept Mech & Mat Engn, Lincoln, NE 68588 USA

[2] Univ Nebraska, Dept Elect & Comp Engn, Lincoln, NE USA

[3] Univ Nebraska, Nebraska Ctr Energy Sci Res, Lincoln, NE USA

[4] Univ Nebraska, Nebraska Ctr Mat & Nanosci, Lincoln, NE USA

[5] Oak Ridge Natl Lab, Neutron Scattering Div, Oak Ridge, TN USA

来源：

JOURNAL OF THE AMERICAN CERAMIC SOCIETY | 2020年 / 103卷 / 08期

基金：

美国国家科学基金会;

关键词：

grain size; high-entropy ceramics; mechanical properties; spark plasma sintering; thermal stability; TETRAGONAL ZIRCONIA; FRACTURE-TOUGHNESS; GROWTH; FABRICATION; DIFFUSION; ALLOYS;

D O I：

10.1111/jace.17103

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

(Hf0.2Zr0.2Ta0.2Nb0.2Ti0.2)C high-entropy ceramics (HEC) with a submicron grain size of 400 to 600 nm were fabricated by spark plasma sintering using a two-step sintering process. Both X-ray and neutron diffractions confirmed the formation of single-phase with rock salt structure in the as-fabricated (Hf0.2Zr0.2Ta0.2Nb0.2Ti0.2)C samples. The effect of submicron grain size on the thermal stability and mechanical properties of HEC was investigated. The grain growth kinetics in the fine-grained HEC was small at 1300 and 1600 degrees C, suggesting high thermal stability that was possibly related to the compositional complexity and sluggish diffusion in HEC. Compared to the coarse-grain HEC with a grain size of 16.5 mu m, the bending strength and fracture toughness of fine-grained HEC were 25% and 20% higher respectively. The improvement of mechanical properties in fine-grained HEC may be attributed to micromechanistic mechanisms such as crack deflection.

引用

页码：4463 / 4472

页数：10

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