Si对(Ti<sub>5</sub>Si<sub>3</sub>+TiBw)/TC11组织与性能影响

钟亮; 付玉; 王荫洋; 韩俊刚; 曹召勋; 宋运坤; 李雷; 徐永东

doi:10.7513/j.issn.1004-7638.2022.01.007

Si对(Ti₅Si₃+TiBw)/TC11组织与性能影响

doi: 10.7513/j.issn.1004-7638.2022.01.007

中国兵器科学研究院宁波分院, 浙江宁波 315103

基金项目: 宁波市自然科学基金项目（202003N4340）；科技创新2025重大专项（2020Z060）。

详细信息

作者简介:
钟亮（1995—），男，湖北麻城人，硕士，研究方向为钛合金及其复合材料，E-mail： m13129966248@163.com

通讯作者:
付玉，女，博士，研究方向为金属基复合材料，E-mail：fuyuayu@126.com

中图分类号: TF823,TF124
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- 文章访问数: 197
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- 被引次数: 0
出版历程
- 收稿日期: 2021-09-26
- 网络出版日期: 2022-04-24
- 刊出日期: 2022-02-28

Effect of Si on microstructure and mechanical properties of (Ti₅Si₃ + TiBw)/TC11

Ningbo Branch of Chinese Academy of Ordnance Science, Ningbo 315103, Zhejiang, China

摘要

摘要: 采用粉末冶金法制备原位自生网状(Ti₅Si₃+TiBw)/TC11复合材料，对其金相组织、微观形貌、力学性能与断口进行研究分析。结果表明：TiBw 、部分Ti₅Si₃分布于基体颗粒周围，呈准连续网状分布；其余Ti₅Si₃分布于基体周围、β-Ti内、α-Ti与β-Ti相界处。随着Si元素的增加，原位生成Ti₅Si₃增多，α-Ti由长片状变为短棒状并趋向于等轴状，有明显细化组织作用。TiBw、Ti₅Si₃起到载荷传递、强化相界等作用，一方面Ti₅Si₃、TiBw 降低基体连通性，另一方面细化组织；复合材料强度提高的同时牺牲了部分塑性。随着Si元素的增加，复合材料强度、塑性先增加后降低。(2vol.%Ti₅Si₃ + 5vol.%TiBw)/TC11具有最高的抗拉强度和抗压强度，分别为 1105.8 MPa和1870.6 MPa，具有优异的综合力学性能。 (Ti₅Si₃+TiBw)/TC11断口形貌以韧窝为主，在断裂过程中 (Ti₅Si₃+TiBw) 起到减缓裂纹扩展的作用。
- 非连续增强钛基复合材料 /
- 粉末冶金 /
- Si /
- 微观组织 /
- 力学性能
Abstract: The in-situ formed (Ti₅Si₃ + TiBw)/TC11 composites with network structure were prepared by powder metallurgy. The metallographic structure, microstructure, mechanical properties and fracture surface of (Ti₅Si₃ + TiBw)/TC11 were analyzed. The results show that TiBw and partial Ti₅Si₃ distribute around the matrix particles in a quasi continuous network. The rest of Ti₅Si₃ distributes around the matrix, in β-Ti and at the boundary between α-Ti and β-Ti. With the increase of Si content, the in-situ reinforcement of Ti₅Si₃ increases, and α-Ti changes from long flake shape to short rod shape and tends to be equiaxed, which can refine the microstructure obviously. TiBw and Ti₅Si₃ play the role of load transfer and phase boundary strengthening, which can reduce the matrix connectivity and refine the matrix microstructure simultaneously. It is found that the strength of the composites is improved accompanying partial decrease of plasticity of the matrix. The strength and plasticity of the composites first increase and then decrease with increase of Si content. The composite of (2vol.%Ti₅Si₃+5vol.%TiBw)/TC11 has the highest tensile strength and compressive strength respectively at 1 105.8 MPa and 1 870.6 MPa, showing excellent mechanical properties. The fracture morphology of (Ti₅Si₃+TiBw)/TC11 composites is mainly dimple, and the reinforcements of Ti₅Si₃ and TiBw can slow down the crack propagation during the fracture process.
- discontinuously reinforced titanium matrix composites /
- powder metallurgy /
- Si /
- microstructure /
- mechanical properties

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图 1 烧结态TMCs 试样XRD图谱

(a) 低倍；(b) 低倍(a)的局部

Figure 1. XRD patterns of sintered TMCs

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图 2 烧结态TMCs致密度

Figure 2. Density of sintered TMCs

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图 3 烧结态TMCs 金相组织

(a) TC11；(b) TMC0；(c) TMC2；(d)TMC2，高倍

Figure 3. Metallographic structure of sintered TMCs

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图 4 网状(Ti₅Si₃+TiBw)/TC11制备原理

Figure 4. Schematic diagram for preparation of network (Ti₅Si₃ + TiBw)/TC11

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图 5 (Ti₅Si₃+TiBw)/TC11的显微组织

Figure 5. Microstructure of (Ti₅Si₃+TiBw)/TC11

(a)、(d) TMC2; (b)、(e) TMC4; (c)、(f) TMC6

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图 6 (Ti₅Si₃+TiBw)/TC11在室温条件下拉伸性能

Figure 6. Tensile properties of (Ti₅Si₃+TiBW)/TC11 at room temperature

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图 7 (Ti₅Si₃ + TiBw)/TC11在室温条件下的压缩应力应变曲线

Figure 7. Compressive stress-strain curves of (Ti₅Si₃+TiBw)/TC11 at room temperature

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图 8 (Ti₅Si₃+TiBw)/TC11在室温条件下的压缩断口形貌

Figure 8. The compressive fracture morphology of (Ti₅Si₃+TiBw)/TC11 at room temperature

(a)、 (d) TC11；(b)、 (e) TMC0；(c)、 (f) TMC2

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表 1 TC11化学成分

Table 1. Chemical compositions of TC11 %

Al	Mo	Zr	Si	Fe	C	O	Ti
5.8～7.0	2.8～3.8	0.8～2.0	0.2～0.35	≤0.25	≤0.08	≤0.15	余量

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表 2 材料增强相名义体积分数及编号

Table 2. Nominal volume fraction of reinforcement and the number of TMCs %

试样	Ti₅Si₃	TiB
TC11
TMC0		5
TMC2	2	5
TMC4	4	5
TMC6	6	5

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表 3 不同增强体含量的(Ti₅Si₃+TiBw)/TC11的室温压缩性能

Table 3. Compression properties of (Ti₅Si₃+TiBw)/TC11 with different reinforcement content at room temperature

试样编号	屈服强度/MPa	抗压强度/MPa	断后压缩率/%
TC11	1409.2±9.4	1684.3±14.5	23.49±0.16
TMC0	1139.1±7.4	1601.1±8.7	16.76±0.13
TMC2	1582.1±10.2	1870.6±10.5	19.89±0.11
TMC4	1444.7±7.9	1800.4±7.4	19.18±0.14
TMC6	1516.6±6.7	1819.4±6.4	15.42±0.08

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