石墨烯/钛基复合材料的界面反应控制、微观组织和压缩性能

王娟; 张法明; 商彩云; 张彬

doi:10.13801/j.cnki.fhclxb.20200421.001

石墨烯/钛基复合材料的界面反应控制、微观组织和压缩性能

doi: 10.13801/j.cnki.fhclxb.20200421.001

东南大学江苏省先进金属材料高技术研究重点实验室，南京 211189

基金项目: 国家自然科学基金-航天先进制造技术研究联合基金(U1737103)

详细信息

通讯作者:
张法明，博士，副教授，博士生导师，研究方向为金属基复合材料，微纳米多孔金属　E-mail：fmzhang@seu.edu.cn

中图分类号: TB331
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- 被引次数: 0
出版历程
- 收稿日期: 2020-01-17
- 录用日期: 2020-04-10
- 网络出版日期: 2020-04-21
- 刊出日期: 2020-12-15

Tailoring of interface reaction, microstructure and compressive properties of graphene reinforced titanium alloy matrix composites

Jiangsu Key Laboratory of Advanced Metallic Materials, Southeast University, Nanjing 211189, China

摘要

摘要: 将Ti6Al4V（TC4）粉末与少层石墨烯（GR）粉末进行三维机械旋转混合，实现了GR在TC4球形粉末表面的均匀包覆，经放电等离子烧结(SPS)得到增强相呈三维网络状分布的GR/TC4复合材料。对不同的SPS烧结温度、保温时间、升温速率和轴向压力对GR与钛基体原位界面反应程度的影响进行了研究，并对界面处不同GR/TC4比例的网状结构复合材料的物相结构、显微组织及室温压缩性能进行了系统性的研究。结果表明，烧结温度和升温速率是影响GR与基体反应程度的主要因素，压力主要影响材料致密度，低温高压快速烧结可以降低GR与基体的反应程度，但高比例的GR残留并没有带来力学性能的大幅提升。对于0.25wt%的GR添加量，GR的反应比例约为70%~80%能得到更加良好的异质界面的结合，获得综合力学性能优异的GR/TC4协同增强的钛合金基复合材料。GR在钛合金基体中的三维网络状分布能调控钛基复合材料的强度与塑性的矛盾。
- 钛基复合材料 /
- 石墨烯 /
- 放电等离子烧结 /
- 网状结构 /
- 压缩性能
Abstract: Few-layered graphene reinforced titanium matrix composites (GR/TC4) with 3D network structures were fabricated through a 3D mixing machine and spark plasma sintering (SPS) technique. The effects of different sintering temperatures, holding time, heating rate and uniaxial pressure in the SPS on the in-situ interface reaction of GR with titanium matrix were studied. The phases, microstructure and compressive properties at room temperature of the network structured composites with different GR/TiC ratios were investigated systematically. Experimental results exhibite that the SPS temperature and heating rate are the key factors for determination of reaction ratio of the GR with matrix and the uniaxial pressure affects relative density of the composites. Low temperature, high pressure and fast sintering can inhibit the reaction between the GR and matrix. However, the composites with more residual GR do not show excellent mechanical properties. It is indicated that excellent compressive strength and ductility integrated mechanical properties are achieved with GR reaction ratio of 70%-80% in the 0.25wt% GR/TC4 composites, where the interface bonding is to an optimal state. The 3D network distribution of GR in the titanium alloy matrix can tailor the conflict between strength and ductility of the titanium matrix nanocomposites.
- titanium matrix composites /
- graphene /
- spark plasma sintering /
- network structure /
- compressive properties

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图 1 Ti6AI4V（TC4）粉末和石墨烯（GR）粉末形貌

Figure 1. Morphologies of Ti6AI4V (TC4) powder and graphene (GR) powder

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图 2 三维网状结构GR/TC4复合材料制备过程示意图

Figure 2. Schematic illustration of the fabrication procedure for 3D network structured GR/TC4 nanocomposites

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图 3 0.25wt% GR/TC4混合粉末SEM图片

Figure 3. SEM images of the 0.25wt% GR/TC4 mixed powder

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图 4 GR/TC4复合材料不同烧结条件下XRD图谱

Figure 4. XRD patterns of the GR/TC4 composites under different sintering conditions

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图 5 TC4和0.5wt% GR/TC4复合材料不同烧结条件下金相照片和SEM图像及EDS结果

Figure 5. Metallographic images and SEM images with inserted EDS results of marked spots of the TC4 and 0.5wt% GR/TC4 composites under different sintering conditions

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图 6 不同烧结条件下TC4和GR/TC4网状结构复合材料的压缩应力-应变曲线

Figure 6. Compressive stress-strain curves of the TC4 and GR/TC4 network structure composites under various sintering conditions

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图 7 0.25wt% GR/TC4复合材料不同烧结条件下压缩断口SEM图像

Figure 7. SEM images of the compressive fracture surfaces of 0.25wt% GR/TC4 composites under various sintering conditions

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图 8 0.25wt% GR/TC4复合材料不同烧结条件下TEM图像

Figure 8. TEM images of the 0.25wt% GR/TC4 composites under different sintering conditions

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图 9 GR与TC4反应程度随烧结温度、升温速率、保温时间变化的示意图

Figure 9. Schematic illustration of the reaction ratio of the GR with TC4 as a function of sintering temperature, heating rate and holding time

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表 1 TC4与GR/TC4网状结构复合材料在不同烧结条件下的压缩性能

Table 1. Compressive properties of the TC4 and GR/TC4 network structure composites under different sintering conditions

Sample	Yield strength σ_0.2/MPa	Compressive strength σ_b/MPa	Fracture strain ε/%
0.5wt%GR/TC4-800℃-50℃/min-10 min	1 039 ± 5	1 509 ± 6	32.8 ± 0.6
0.5wt%GR/TC4-900℃-50℃/min-10 min	1 091 ± 2	1 782 ± 3	35.9 ± 0.2
0.5wt%GR/TC4-1000℃-50℃/min-10 min	1 148 ± 6	1 859 ± 5	36.5 ± 0.5
0.5wt%GR/TC4-1050℃-50℃/min-10 min	1 140 ± 4	1 842 ± 3	35.8 ± 0.4
0.25wt%GR/TC4-1000℃-100℃/min-7 min	1 056 ± 3	1 851 ± 4	38.9 ± 0.3
0.25wt%GR/TC4-1000℃-100℃/min-10 min	1 087 ± 5	1 914 ± 6	39.2 ± 0.5
0.25wt%GR/TC4-1000℃-100℃/min-15 min	1 086 ± 4	1 984 ± 5	41.3 ± 0.5
0.25wt%GR/TC4-1050℃-50℃/min-7 min	1 148 ± 3	1 773 ± 4	35.2 ± 0.2
TC4-1000℃-100℃/min-7 min	997 ± 2	1 709 ± 3	39.5 ± 0.4
TC4-1000℃-100℃/min-10 min	991 ± 3	1 628 ± 5	34.9 ± 0.3
TC4-1050℃-50℃/min-7 min	1 002 ± 4	1 621 ± 3	35.1 ± 0.6
TC4-1000℃-100℃/min-15 min	989 ± 3	1 613 ± 2	34.3 ± 0.3

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