三维双连续 Ti2AlNx MAX 相增强镁基复合材料的制备及性能研究

陈宛彤; 于文波; 张鹏程; 皮旭锋; 马超胜; 马国政; 张林

doi:10.1007/s12613-022-2427-2

Volume 29 Issue 7

Jul. 2022

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文章导航 > 矿物冶金与材料学报（英文） > 2022 > 29(7): 1406-1412

Wantong Chen, Wenbo Yu, Pengcheng Zhang, Xufeng Pi, Chaosheng Ma, Guozheng Ma, and Lin Zhang, Fabrication and performance of 3D co-continuous magnesium composites reinforced with Ti₂AlN_x MAX phase, Int. J. Miner. Metall. Mater., 29(2022), No. 7, pp. 1406-1412. https://doi.org/10.1007/s12613-022-2427-2

Cite this article as:

Wantong Chen, Wenbo Yu, Pengcheng Zhang, Xufeng Pi, Chaosheng Ma, Guozheng Ma, and Lin Zhang, Fabrication and performance of 3D co-continuous magnesium composites reinforced with Ti2AlNx MAX phase, Int. J. Miner. Metall. Mater., 29(2022), No. 7, pp. 1406-1412. https://doi.org/10.1007/s12613-022-2427-2

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研究论文

三维双连续 Ti₂AlN_xMAX 相增强镁基复合材料的制备及性能研究

1)
北京交通大学机械与电子控制工程学院，北京 100044，中国
2)
陆军装甲兵学院装备再制造技术国防科技重点实验室，北京 100072，中国
3)
中国机械科学研究总院集团有限公司，北京 100044，中国

通讯作者:
于文波 E-mail: wbyu@bjtu.edu.cn

文章亮点

(1) 成功制备出Ti₂AlN_x(x = 0.9, 1.0) 增强的三维双连续网络结构的镁基复合材料。

(2) 二维与三维表征相结合，通过三维真实重构揭示材料的三维信息。

(3) 系统研究了N缺位对Ti₂AlN_x/Mg复合材料微观组织和力学性能的影响规律。

(4) 总结并提出了通过控制Ti₂AlN中的N缺位和层次结构可有效调节Ti₂AlN/Mg复合材料的力学性能。

中文摘要

本文采用无压浸渗法将 Mg 浸渗到多孔Ti₂AlN_x(x = 0.9, 1.0) 预制体中，制备了N缺位Ti₂AlN MAX相增强的三维双连续网络结构的镁基复合材料。将二维和三维表征相结合，讨论了其力学性能镁基复合材料。将二维和三维表征相结合，讨论了其力学性能与显微组织的关系。通过X射线衍射(XRD)和扫描电子显微镜分析，未发现预制体中有杂质相。三维重构结果表明，Ti₂AlN_x预制体为疏松多孔结构，孔洞分布均匀，内部为连续互通的网络结构，是熔融态Mg进入预制体内部的主要通道。研究发现，Ti₂AlN_x中的N空位和晶粒尺寸效应导致复合材料的力学性能降低，尤其是压缩屈服强度和显微硬度。Ti₂AlN_0.9/Mg的压缩屈服强度和显微硬度分别为353 MPa和1.12 GPa，分别比Ti₂AlN/Mg低了8.55%和6.67%。复合材料中连续的骨架结构和较强的界面结合强度，使得塑性Mg基体有效阻止了Ti₂AlN_x中的裂纹的扩展。此外，压缩试验结果表明，Ti₂AlN和Mg间没有发生界面脱粘，两者均有效地参与了变形，Ti₂AlN相出现了典型的分层，Mg发生强烈的塑性变形。因此，本研究表明，可以通过控制Ti₂AlN中的N缺位和层次结构来调节Ti₂AlN/Mg复合材料的力学性能。

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Research Article

Fabrication and performance of 3D co-continuous magnesium composites reinforced with Ti₂AlN_x MAX phase

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Abstract

Abstract

Magnesium composites reinforced by N-deficient Ti₂AlN MAX phase were first fabricated by non-pressure infiltration of Mg into three-dimensional (3D) co-continuous porous Ti₂AlN_x (x = 0.9, 1.0) preforms. The relationship between their mechanical properties and microstructure is discussed with the assessment of 2D and 3D characterization. X-ray diffraction (XRD) and scanning electron microscopy detected no impurities. The 3D reconstruction shows that the uniformly distributed pores in Ti₂AlN_x preforms are interconnected, which act as infiltration tunnels for the melt Mg. The compressive yield strength and microhardness of Ti₂AlN_0.9/Mg are 353 MPa and 1.12 GPa, respectively, which are 8.55% and 6.67% lower than those of Ti₂AlN/Mg, respectively. The typical delamination and kink band occurred in Ti₂AlN_x under compressive and Vickers hardness (V_H) tests. Owing to the continuous skeleton structure and strong interfacial bonding strength, the crack initiated in Ti₂AlN_x was blocked by the plastic Mg matrix. This suggests the possibility of regulating the mechanical performance of Ti₂AlN/Mg composites by controlling the N vacancy and the hierarchical structure of Ti₂AlN skeleton.
- Ti₂AlN;
- magnesium matrix composites;
- co-continuous structure;
- N vacancy

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