原位生成铁基复合材料中TiB<sub>2</sub>的三维形貌重构

doi:10.11900/0412.1961.2018.00297

金属学报

2019, Vol. 55

Issue (1): 133-140 DOI: 10.11900/0412.1961.2018.00297

本期目录 | 过刊浏览

原位生成铁基复合材料中TiB₂的三维形貌重构

王宝刚¹, 易红亮¹(

), 王国栋¹, 骆智超^2,³, 黄明欣^2,³

1 东北大学轧制技术及连轧自动化国家重点实验室沈阳 110819
2 香港大学机械工程系香港 00852
3 香港大学深圳研究院深圳 518000

Reconstruction of 3D Morphology of TiB₂ in In Situ Fe Matrix Composites

Baogang WANG¹, Hongliang YI¹(

), Guodong WANG¹, Zhichao LUO^2,³, Mingxin HUANG^2,³

1 State Key Laboratory of Rolling Technology and Automation, Northeastern University, Shenyang 110819, China
2 Department of Mechanical Engineering, The University of Hong Kong, Hong Kong 00852, China
3 Shenzhen Institute of Research and Innovation, The University of Hong Kong, Shenzhen 518000, China

引用本文:

王宝刚, 易红亮, 王国栋, 骆智超, 黄明欣. 原位生成铁基复合材料中TiB₂的三维形貌重构[J]. 金属学报, 2019, 55(1): 133-140.
Baogang WANG, Hongliang YI, Guodong WANG, Zhichao LUO, Mingxin HUANG. Reconstruction of 3D Morphology of TiB₂ in In Situ Fe Matrix Composites[J]. Acta Metall Sin, 2019, 55(1): 133-140.

全文: PDF(6033 KB) HTML

摘要:

采用腐蚀法和计算机辅助设计(Creo Parametric)技术重构了原位生成Fe-TiB₂复合材料中增强相TiB₂在铁素体基体中的三维形貌,利用OM和SEM对增强相TiB₂的二维形貌和三维形貌进行比对分析,并结合压缩实验重新诠释了该材料的断裂机理。结果表明：单晶TiB₂初生相为六边形端面的八面体棱柱结构,多由2个或多个尺寸不一的单晶棱柱交错贯穿组成,其空间位置杂乱无章;共晶相TiB₂由瓣状/细柱状相和枝晶状相组成。Fe-TiB₂复合材料在承受载荷时,瓣状/细柱状和枝晶状共晶相相较于初生相TiB₂更容易发生脆断,成为材料断裂失效的主要诱因。二维微观组织观察到的小颗粒TiB₂相在实际空间中并不存在,通过控制凝固过程获得真正三维空间上的小颗粒TiB₂相对该复合材料的性能至关重要。

关键词 ：铁基复合材料, 增强相TiB₂, 三维形貌, 初生相, 共晶相

Abstract：

TiB₂strengthened Fe matrix composites (Fe-TiB₂) are potential lightweight materials for lightweight structure materials as they possess high modulus, low density, high strength and good ductility. More importantly, Fe-TiB₂composite can be produced by eutectic solidification, which is suitable for massive production using thin slab casting and strip casting in the steel industry. The microstructure of Fe-TiB₂ composite is composed of ferrite matrix, primary TiB₂ and eutectic TiB₂ reinforcements. Ceramic TiB₂ is a hard brittle phase and it is easy to generate stress concentration when bearing load. The shape and size of TiB₂ can affect the mechanical properties of Fe-TiB₂ composite and the formability of sheet metal. The morphology and size of TiB₂ reinforcements are commonly observed using optical or electron microscope, which can only provide two-dimensional (2D) cross-section of the reinforcements. Nevertheless, the TiB₂ particles have various aspect ratios in three-dimensional (3D) space, which have not yet been well investigated. The present work proposes a new method combining deep etching and computer aided design (Creo Parametric) technology to reconstruct the 3D morphology of TiB₂ reinforcements in the Fe-TiB₂ composites. The OM, SEM were used to compare and analyze the 2D and 3D morphologies of the TiB₂ reinforcements. The fracture mechanism of the Fe-TiB₂ composite was reinterpreted by compression test. The results indicated that the primary TiB₂ reinforcements have an octahedral prism structure, which is mostly composed of two or even more single crystal prisms, and are randomly distributed in the matrix without preferred orientations. The eutectic TiB₂ reinforcements consist of lamelliform/fine columnar phase and dendrite phase. The lamelliform/fine columnar and dendrite eutectic phase in Fe-TiB₂ composite are more prone to brittle fracture than the primary phase TiB₂during loading. Therefore, it is the main cause of fracture failure of the material during loading. The small TiB₂ particles observed by 2D microstructure do not exist in real 3D space. It is proposed that small and spherical TiB₂ particles are preferred and could be produced by controlling solidification process.

Key words： Fe matrix composite reinforced phase TiB₂ three-dimensional morphology primary phase eutectic phase

收稿日期: 2018-07-01

ZTFLH:

O766

基金资助:国家自然科学基金项目Nos.51722402和U1560204及中央高校基本科研业务费专项资金项目No.N170705001

作者简介:

作者简介王宝刚,男,1987年生,博士

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https://www.ams.org.cn/CN/10.11900/0412.1961.2018.00297 或 https://www.ams.org.cn/CN/Y2019/V55/I1/133

图1 Fe-13%TiB2复合材料的OM像及其抽象示意图

图2 Fe-13%TiB2复合材料深腐蚀后的SEM像及增强相TiB2三维形貌重构示意图

图3 Fe-13%TiB2复合材料经不同压缩应变量后的SEM像

图4 剖切重构后的三维增强相TiB2及其对应的典型的二维形貌示意图

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