CNTs/Mg-9Al复合材料微观组织、力学及导热性能

doi:10.11868/j.issn.1001-4381.2021.000960

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摘要

研究了CNTs的加入对Mg-9Al镁基复合材料时效行为的影响, 探讨了时效处理过程中微观组织、力学性能及导热性能的演变规律。结果表明: 添加的CNTs增大了基体合金中铝元素的固溶度, 并在时效过程中限制晶界的迁移, 在二者共同作用下, 促进基体中连续β-Mg₁₇Al₁₂相的析出, 且随着CNTs含量的增加, 连续析出的比例增大; 与基体呈共格关系的杆状连续析出相能够有效地阻碍位错运动, 提高复合材料的力学性能, 其中峰时效态0.4CNTs/Mg-9Al复合材料的屈服强度、抗拉强度、热扩散系数和热导率分别为275 MPa, 369 MPa, 34.5 mm²/s和68.4 W/(m·K), 相较于时效前Mg-9Al合金分别提升了17%, 23%, 43%和45%。

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	李淑波
	侯江涛
	孟繁婧
	刘轲
	王朝辉
	杜文博

关键词 ：碳纳米管, 镁基复合材料, 时效处理, 力学性能, 热导率

Abstract：

The effect of carbon nanotubes (CNTs) on the aging behavior of Mg-9Al matrix composites was studied, and the evolution of microstructures, mechanical properties and thermal conductivity of composites during the aging treatment were discussed. Results show that the addition of CNTs increases the solid solubility of Al in Mg matrix and limited the migration of grain boundaries during the aging process, which can promote the formation of continuous precipitated phases β-Mg₁₇Al₁₂ in CNTs/Mg-9Al composites. The rod-shaped continuous precipitates in coherent relationship with Mg matrix can effectively hinder the dislocation movement, which can improve the mechanical properties of the composites. Besides, the reduction of solid solution Al atoms during aging process and the addition of CNTs can improve the thermal conductivity of the composites. The property evaluation indicates that the tensile yield strength, ultimate tensile strength, diffusivity and thermal conductivity of peak-aged 0.4CNTs/Mg-9Al composite are 275 MPa, 369 MPa, 34.5 mm²/s and 68.4 W/(m·K) respectively, showing 17%, 23%, 43% and 45% increasing in comparison with those of Mg-9Al before aging.

Key words： CNTs magnesium matrix composites aging treatment mechanical property thermal conductivity

收稿日期: 2021-09-30 出版日期: 2023-01-16

中图分类号:

TB333

基金资助:国家重点研发项目(2016YFB0301101)

通讯作者: 杜文博 E-mail: duwb@bjut.edu.cn

作者简介: 杜文博(1964—)，男，教授，博士，主要从事镁基复合材料、高强镁合金、生物医用镁合金及结构功能一体化高导热镁合金等研究，联系地址：北京市朝阳区平乐园100号北京工业大学材料与制造学部(100124)，E-mail: duwb@bjut.edu.cn

引用本文:

李淑波, 侯江涛, 孟繁婧, 刘轲, 王朝辉, 杜文博. CNTs/Mg-9Al复合材料微观组织、力学及导热性能[J]. 材料工程, 2023, 51(1): 26-35.
Shubo LI, Jiangtao HOU, Fanjing MENG, Ke LIU, Zhaohui WANG, Wenbo DU. Microstructure, mechanical and thermal properties of CNTs/Mg-9Al composites. Journal of Materials Engineering, 2023, 51(1): 26-35.

链接本文:

http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2021.000960 或 http://jme.biam.ac.cn/CN/Y2023/V51/I1/26

Fig.1 Mg-9Al合金(a)和0.4CNTs /Mg-9Al复合材料(b)的SEM组织(1)及能谱分析(2)

Fig.2 合金及复合材料在不同温度T5时效处理的硬度变化曲线
(a)Mg-9Al合金；(b)0.4CNTs/Mg-9Al复合材料

Fig.3 Mg-9Al合金及CNTs/Mg-9Al复合材料时效前后的XRD图谱

Fig.4 时效态Mg-9Al合金及CNTs/Mg-9Al复合材料的SEM图
(a)Mg-9Al合金；(b)0.2CNTs/Mg-9Al复合材料；(c)0.4CNTs/Mg-9Al复合材料；(d)0.6CNTs/Mg-9Al复合材料

Fig.5 时效态0.4CNTs/Mg-9Al复合材料中β-Mg₁₇Al₁₂相的TEM照片
(a)杆状相；(b)颗粒相；(c)不规则条状相；(d)纳米颗粒相

Fig.6 0.4CNTs/Mg-9Al复合材料在欠时效态(a)及峰时效态(b)~(d)β-Mg₁₇Al₁₂相的TEM照片

Fig.7 Mg-9Al合金和CNTs/Mg-9Al复合材料的力学性能
(a)时效态样品拉伸应力-应变曲线；(b)时效态样品的屈服强度和抗拉强度；(c)样品时效前后屈服强度；(d)样品时效前后的抗拉强度

Table 1 时效前后Mg-9Al合金与0.4CNTs/Mg-9Al复合材料的力学和导热性能

Fig.8 时效态0.4CNTs/Mg-9Al复合材料拉伸断裂后的TEM照片
(a)杆状β-Mg₁₇Al₁₂相与位错交互作用；(b)不规则条状及颗粒状β-Mg₁₇Al₁₂相附近的应力集中；(c)纳米颗粒状β-Mg₁₇Al₁₂相周围的点阵畸变; (d)杆状β-Mg₁₇Al₁₂相周围的点阵畸变

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