Microstructure and High Temperature Mechanical Properties of In⁃Suit Nano⁃Particles Reinforced Al Matrix Composites

doi:10.12422/j.issn.1672-6952.2023.02.005

Abstract

Abstract:

In this study, nano?TiO₂ was used as the additive phase, and B₂O₃ and H₃BO₃ were doped in a certain proportion, and then 4% nano?oxide particles reinforced Al matrix composites were prepared by high?energy ball milling and powder metallurgy. Finally, Al matrix composite rods were prepared with an extrusion ratio of 16∶1 at 723 K. The results show that the dispersion distribution of nano?oxides in Al matrix can be realized after 4 h ball milling. After vacuum hot pressing at 893 K, the addition phase reacts with the Al matrix in?situ and forms Al₂O₃ etc. When the molar ratio of Ti to B is 1.0∶1.5, the mechanical properties of the composites are the best. At the same time, when the chemical composition of the precursor of B element is different, the mechanical properties of the composites are significantly different; the tensile strength of TiO₂+H₃BO₃/Al at room temperature and 623 K is 507.7 MPa and 151.3 MPa, respectively, showing the highest room temperature mechanical properties; the tensile strength of TiO₂+B₂O₃/Al at room temperature and 623 K is 353.7 MPa and 167.1 MPa, respectively, manifesting the excellent high?temperature mechanical properties.

Key words: Nano, TiO₂/Al matrix composite, Ball milling, Powder metallurgy, High temperature mechanical properties

摘要：

以纳米TiO₂为添加相，按一定比例添加B₂O₃和H₃BO₃，采用高能球磨和粉末冶金法相结合的方法制备了体积分数为4%的纳米氧化物粒子增强Al基复合材料，最后在723 K的条件下以16∶1的挤压比制备了复合材料棒材。结果表明，经过4 h的球磨后，可以实现纳米氧化物在Al基体中的弥散分布；经过893 K的真空热压后，添加相与Al基体发生原位化学反应并生成了Al₂O₃等。当Ti与B物质的量比为1.0∶1.5时，复合材料的力学性能最优；同时，当B元素的先驱体化学成分不同时，复合材料的力学性能差异显著；TiO₂+H₃BO₃/Al在室温和623 K下的拉伸强度分别为507.7 MPa和151.3 MPa，展现出最高的室温力学性能；TiO₂+B₂O₃/Al在室温和623 K下的拉伸强度分别为353.7 MPa和167.1 MPa，展现出最佳的高温力学性能。

关键词: 纳米, TiO₂/Al基复合材料, 球磨, 粉末冶金, 高温力学性能

CLC Number:

TQ050.4+3

Junru Zhang, Baoyin Lu, Jinquan Li, Yuning Zan, Wenguang Wang. Microstructure and High Temperature Mechanical Properties of In⁃Suit Nano⁃Particles Reinforced Al Matrix Composites[J]. Journal of Liaoning Petrochemical University, 2023, 43(2): 26-34.

张君儒, 卢宝印, 李金权, 昝宇宁, 王文广. 原位纳米粒子增强Al基复合材料的微观组织及高温力学性能[J]. 辽宁石油化工大学学报, 2023, 43(2): 26-34.

Figures/Tables 10

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样品编号	m（TiO₂）/g	m（H₃BO₃）/g	m（B₂O₃）/g	n（Ti）/n（B）	m（Al粉）/g
1		31.40		0∶1.0	907.20
2			35.36	0∶1.0	907.20
3	60.96			1.0∶0	907.20
4	60.96	47.10		1.0∶1.0	907.20
5	60.96	70.66		1.0∶1.5	907.20
6	60.96	94.20		1.0∶2.0	907.20
7	60.96		26.52	1.0∶1.0	907.20
8	60.96		39.80	1.0∶1.5	907.20
9	60.96		53.06	1.0∶2.0	907.20

样品编号	m（TiO₂）/g	m（H₃BO₃）/g	m（B₂O₃）/g	n（Ti）/n（B）	m（Al粉）/g
1		31.40		0∶1.0	907.20
2			35.36	0∶1.0	907.20
3	60.96			1.0∶0	907.20
4	60.96	47.10		1.0∶1.0	907.20
5	60.96	70.66		1.0∶1.5	907.20
6	60.96	94.20		1.0∶2.0	907.20
7	60.96		26.52	1.0∶1.0	907.20
8	60.96		39.80	1.0∶1.5	907.20
9	60.96		53.06	1.0∶2.0	907.20

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