B<sub>4</sub>C/TiB<sub>2</sub>复相陶瓷硬度压痕的尺寸效应

doi:10.11901/1005.3093.2016.686

材料研究学报

2017, Vol. 31

Issue (12): 894-900 DOI: 10.11901/1005.3093.2016.686

研究论文

本期目录 | 过刊浏览

B₄C/TiB₂复相陶瓷硬度压痕的尺寸效应

郭伟明(

), 谭大旺, 吴利翔, 林华泰, 伍尚华

广东工业大学机电工程学院广州 510006

Indentation Size Effect for the Hardness of B₄C/TiB₂ Ceramics

Weiming GUO(

), Dawang TAN, Lixiang WU, Huatai LIN, Shanghua WU

School of Electromechanical Engineering, Guangdong University of Technology, Guangzhou 510006, China

引用本文:

郭伟明, 谭大旺, 吴利翔, 林华泰, 伍尚华. B₄C/TiB₂复相陶瓷硬度压痕的尺寸效应[J]. 材料研究学报, 2017, 31(12): 894-900.
Weiming GUO, Dawang TAN, Lixiang WU, Huatai LIN, Shanghua WU. Indentation Size Effect for the Hardness of B₄C/TiB₂ Ceramics[J]. Chinese Journal of Materials Research, 2017, 31(12): 894-900.

全文: PDF(2820 KB) HTML

摘要:

研究了热压烧结的80%(体积分数,下同)B₄C/TiB₂和20%B₄C/TiB₂复相陶瓷的压痕形貌和硬度压痕的尺寸效应。与20%B₄C/TiB₂相比,80%B₄C/TiB₂具有更高的致密度和硬度,但是其断裂韧性较低。两个样品的硬度均显示出显著的硬度压痕尺寸效应(ISE),即随着载荷的增加硬度逐渐下降。但是对于80%B₄C/TiB₂样品,在载荷增加过程中出现的裂纹导致其硬度值在局部载荷范围内稍微增大。理论模拟结果表明,两个样品的ISE现象与所选定的理论模型都较为符合,其中用MPSR模型对硬度测量值的拟合最为准确,样品20%B₄C/TiB₂的ISE程度稍大于80%B₄C/TiB₂。根据理论模型,80%B₄C/TiB₂真实硬度比20%B₄C/TiB₂的高4.4~6.5 GPa。

关键词 ：复合材料,B₄C/TiB₂,模拟,硬度压痕尺寸效应,显微结构,力学性能

Abstract：

Indentation size effect on the hardness measurement of hot-pressed 80%B₄C/TiB₂ and 20%B₄C/TiB₂ (in volume fraction) was investigated, while the indentation morphology was also characterized. In comparison with 20%B₄C/TiB₂, 80%B₄C/TiB₂ possesses higher relative density and hardness, but lower toughness. The two ceramics exhibit clearly the indentation size effect (ISE), whereby the measured hardness decreases with the increasing load. However, a slight increase of the measured hardness for 80%B₄C/TiB₂ with the increasing load, which may be ascribed to the crack occurrence for indentations during loading. The observed ISE-phenomena for the two ceramics can be described via several existing theory models, however among them the modified proportional specimen resistance model is the most suitable one. Accordingly, the ISE-degree for 80%B₄C/TiB₂ ceramic is slightly stronger than that for 20%B₄C/TiB₂ ceramic, while the true hardness of 80%B₄C/TiB₂ ceramic should be 4.4~6.5 GPa higher than that of 20%B₄C/TiB₂ ceramic.

Key words： composites, B₄C/TiB₂, modeling, indentation size effect, microstructure, mechanical properties

收稿日期: 2016-11-25

ZTFLH:

TQ174

基金资助:国家自然科学基金(51674236和51034012)

作者简介:

作者简介郭伟明,男,1982年生,博士

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链接本文:

https://www.cjmr.org/CN/10.11901/1005.3093.2016.686 或 https://www.cjmr.org/CN/Y2017/V31/I12/894

表1 样品的成分和性能

图1 样品的SEM显微形貌

图2 维氏硬度与载荷的关系

图3 载荷为0.098 N时的压痕位置和形貌

图4 在不同载荷条件下80%B4C/TiB2的压痕形貌

表2 根据不同ISE理论模型得到的样品真实硬度

图5 使用不同模型样品的ISE模拟曲线

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