CF-B<sub>4</sub>C/Al中子吸收复合材料的微观组织及力学行为

孙致平; 张翠英; 陈洪胜

doi:10.13801/j.cnki.fhclxb.20210529.001

CF-B₄C/Al中子吸收复合材料的微观组织及力学行为

doi: 10.13801/j.cnki.fhclxb.20210529.001

孙致平^{1, 2, 3,},
张翠英^1,,
陈洪胜^4, ,

1.
常州工程职业技术学院　智能制造学院，常州 213164
2.
江苏晨光涂料有限公司，常州 213154
3.
马鞍山浩远新材料科技有限公司，马鞍山 243000
4.
太原理工大学　机械与运载工程学院，太原 030024

基金项目: 产学研横向科研项目(RH2000002823)；国家自然科学基金(51805358)；常州工程职业技术学院高层次人才科研启动基金(11130900118003)

详细信息

通讯作者:
陈洪胜，博士，副教授，硕士生导师，研究方向为先进金属基复合材料制备及成形技术　E-mail：chenhongsheng@tyut.edu.cn

中图分类号: TB333
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出版历程
- 收稿日期: 2021-02-23
- 修回日期: 2021-05-05
- 录用日期: 2021-05-07
- 网络出版日期: 2021-05-31
- 刊出日期: 2022-02-01

Microstructure and mechanical behavior of CF-B₄C/Al neutron absorbing composites

SUN Zhiping^{1, 2, 3
,},
ZHANG Cuiying^1
,,
CHEN Hongsheng^{4
, ,}

1.
School of Intelligent Manufacturing, Changzhou Vocational Institute of Engineering, Changzhou 213164, China
2.
Jiangsu Chenguang Coating CO. LTD., Changzhou 213154, China
3.
Maanshan Haoyuan New Materials Technology CO. LTD., Maanshan 243000, China
4.
College of Mechanical and Vehicle Engineering, Taiyuan University of Technology, Taiyuan 030024, China

摘要

摘要: 基于B₄C良好的中子吸收性能和碳纤维(CF)慢化中子的性能，采用真空热压烧结方法制备了集结构与功能一体具有不同CF含量的CF-B₄C混合增强6061Al基复合材料，并对热轧后的组织形貌和力学性能进行分析。结果表明，大变形量热轧后B₄C颗粒和CF分布较均匀，没有出现大面积的聚集现象，但是少量B₄C颗粒和CF在轧制压力的作用下发生了断裂。当变形量达到60%时，复合材料的抗拉强度可达(265±3) MPa，与6061Al合金的抗拉强度相比，不同厚度的CF-B₄C/Al复合材料的抗拉强度分别提高了80%和112%。随着CF含量的增加，CF-B₄C/Al复合材料的强度和延伸率均减小。当CF含量达到5wt%时，断裂的主要原因是有纤维的聚集及纤维沿断裂方向排布。
- CF-B₄C/Al复合材料 /
- 真空热压烧结 /
- 热轧 /
- 组织形貌 /
- 拉伸断裂 /
- 中子吸收
Abstract: Based on the good neutron absorption property of B₄C and the moderated neutron property of carbon fiber (CF), CF-B₄C mixed-reinforced 6061Al matrix composites with different CF contents were prepared by vacuum hot pressing sintering method. The microstructure and mechanical properties of the composites were analyzed. After hot rolling with large deformation, the B₄C particles are distributed evenly without large area of particle aggregation, but a small amount of B₄C particles and CF are brittle. When the deformation reaches 60%, the tensile strength of the material can reach (265±3) MPa. Compared with the tensile strength of 6061Al alloy, the tensile strength values of CF-B₄C/Al composites with different thicknesses increase by 80% and 112% respectively. With the increase of CF content, the strength and elongation of CF-B₄C/Al composites decrease. When the content of CF reaches 5wt%, the main reason of fracture is the aggregation of fibers and the arrangement of fibers along the fracture direction.
- CF-B₄C/Al composites /
- vacuum hot pressing sintering /
- hot rolling /
- tissue morphology /
- tensile fracture /
- neutron absorption

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图 1 真空热压烧结原理图

Figure 1. Schematic diagram of vacuum hot pressing sintering

FAPAS—Field activated and pressure assisted synthesis

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图 2 热压烧结工艺路线图

Figure 2. Process roadmap of hot pressing sintering

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图 3 60%变形量下碳纤维(CF)-B₄C/Al复合材料的SEM图像：(a) CF断裂；(b) B₄C颗粒断裂

Figure 3. SEM images of carbon fiber (CF)-B₄C/Al composites with 60% deformation: (a) CF breakage; (b) B₄C particle fracture

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图 4 60%变形量下CF-B₄C/Al复合材料元素分布图

Figure 4. Element distribution map of CF-B₄C/Al composites under 60% deformation

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图 5 B₄C/Al、CF/Al界面处的线扫描图谱

Figure 5. Line-scanning atlas of the interface in B₄C/Al and CF/Al

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图 6 CF-B₄C/Al复合材料的XRD图谱

Figure 6. XRD patterns of CF-B₄C/Al composites

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图 7 CF-B₄C/Al复合材料的应力-应变曲线

Figure 7. Stress-strain curves of CF-B₄C/Al composites

PR—Parallel rolling; VR—Vertical rolling

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图 8 CF-B₄C/Al复合材料的应力-应变曲线

Figure 8. Stress-strain curves of CF-B₄C/Al composites

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图 9 热轧后CF-B₄C/Al复合材料的断口形貌：(a)纤维拔出；(b)颗粒断裂；(c)纤维断裂；(d)纤维聚集；(e)纤维横向排布；(f)纤维脱粘断裂

Figure 9. Fracture morphologies of CF-B₄C/Al composites after hot rolling: (a) Fiber pull-out; (b) Particle fracture; (c) Fiber breakage; (d) Fiber aggregation; (e) Lateral fiber layout; (f) Fiber debonding fracture

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图 10 CF-B₄C/Al复合材料的断裂机理示意图

Figure 10. Schematic of fracture mechanism of CF-B₄C/Al composites

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表 1 6061铝合金化学成分

Table 1. Chemical composition of 6061Al alloy wt%

Si	Fe	Cu	Mn	Mg	Cr	Zn	Ti	Al
0.6	0.7	0.25	0.15	0.8	0.1	0.25	0.15	Rest

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表 2 B₄C化学成分

Table 2. Chemical composition of B₄C wt%

B	C	Ca	Fe	Si	F	Cl
80.0	18.1	0.3	1.0	0.5	0.025	0.075

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表 3 CF-B₄C/Al复合材料的拉伸性能

Table 3. Tensile properties of CF-B₄C/Al composites

Carbon fiber content/wt%	Deformation/%	σ_0.2/MPa	σ_UTS/MPa	ε/%
1	40	154.3	198.2	2.92
1	50	161	216.7	2.88
1	60	184.6	268	1.89
5	40	132.7	175.6	2.18
5	50	140.5	182.3	2.36
5	60	142.3	185.2	2.78
Notes: σ_0.2—Yield strength; σ_UTS—Ultimate strength; ε—Ultimate elongation after aging.

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