碳纳米管<strong>(CNTs)</strong>增强<strong>AZ91</strong>镁基复合材料组织与力学性能研究

doi:10.11900/0412.1961.2019.00173

金属学报

2019, Vol. 55

Issue (12): 1537-1543 DOI: 10.11900/0412.1961.2019.00173

研究论文

本期目录 | 过刊浏览

碳纳米管(CNTs)增强AZ91镁基复合材料组织与力学性能研究

覃嘉宇^1,²,李小强^1,²,金培鹏^1,²,王金辉^1,²,朱云鹏^1,^2,³(

)

1. 青海大学新型轻合金省重点实验室西宁 810016
2. 青海大学青海省轻金属合金及深加工工程技术研究中心西宁 810016
3. 清华大学机械工程学院北京 100084

Microstructure and Mechanical Properties of Carbon Nanotubes (CNTs) Reinforced AZ91 Matrix Composite

QIN Jiayu^1,²,LI Xiaoqiang^1,²,JIN Peipeng^1,²,WANG Jinhui^1,²,ZHU Yunpeng^1,^2,³(

)

1. Qinghai Provincial Key Laboratory of New Light Alloys, Qinghai University, Xining 810016, China
2. Qinghai Provincial Engineering Research Center of High Performance Light Metal Alloys and Forming, Qinghai University, Xining 810016, China
3. Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China

引用本文:

覃嘉宇, 李小强, 金培鹏, 王金辉, 朱云鹏. 碳纳米管(CNTs)增强AZ91镁基复合材料组织与力学性能研究[J]. 金属学报, 2019, 55(12): 1537-1543.
QIN Jiayu, LI Xiaoqiang, JIN Peipeng, WANG Jinhui, ZHU Yunpeng. Microstructure and Mechanical Properties of Carbon Nanotubes (CNTs) Reinforced AZ91 Matrix Composite[J]. Acta Metall Sin, 2019, 55(12): 1537-1543.

全文: PDF(8520 KB) HTML

摘要:

采用低温粉末冶金及热挤压工艺制备了具有超细晶组织的0.1%CNTs/AZ91 (质量分数)镁基复合材料。通过SEM、XRD、TEM对镁基复合材料的微观组织进行了表征，并对其室温力学性能进行测试。结果表明：CNTs在复合材料中分布均匀，CNTs的加入使得复合材料的晶粒尺寸从0.552 μm细化到0.346 μm，并促进了β相的析出，同时弱化了基面织构。复合材料的抗压强度和屈服强度分别达到了617和445 MPa，较基体提高了8.8%和7.2%；其抗拉强度和屈服强度分别达到了393和352 MPa，与基体相比分别提高了4.5%和6.0%。对强化机制进行分析，发现细晶强化和载荷传递是0.1%CNTs/AZ91复合材料的主要强化机制。

关键词 ：镁基复合材料, 低温粉末冶金, 显微组织, 力学性能, 强化机制

Abstract：

Magnesium alloys are well known for their low density, high specific strength. However, they are often limited by unsatisfactory mechanical properties. To meet the challenge of growing demand for light structural applications, metal matrix composites (MMCs) have attracted more attention. Carbon nanotubes (CNTs) have attracted much attention as the ideal reinforcements for MMCs due to their excellent mechanical strength and Young's modulus. In this work, 0.1%CNTs/AZ91 (mass fraction) magnesium matrix composites were prepared by low temperature powder metallurgy and hot extrusion. The magnesium alloy and composites were observed and analyzed by SEM, XRD and TEM. The room temperature mechanical properties of the composites were tested by Instron 5982 machine. The results showed that the CNTs distributed uniformly in the composites. The CNTs have an effect on reducing grain size, promoting precipitation of β-Mg₁₇Al₁₂ and weakening basal texture. The compressive strength and yield strength of the composites reached 617 and 445 MPa, which increased by 8.8% and 7.2%, respectively. The tensile strength and yield strength were 393 and 352 MPa, which 4.5% and 6.0% MPa higher than the matrix, respectively. It can be found that fine grain strengthening and load transfer play a leading role in improving the strength in the 0.1%CNTs/AZ91 magnesium matrix composites.

Key words： magnesium matrix composite low temperature powder metallurgy microstructure mechanical property strengthening mechanism

收稿日期: 2019-05-31

ZTFLH:

TB333

基金资助:国家自然科学基金项目(No.51661028);青海省重大科技专项项目(No.2018-GX-A1)

作者简介: 覃嘉宇，男，1995年生，硕士生

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https://www.ams.org.cn/CN/10.11900/0412.1961.2019.00173 或 https://www.ams.org.cn/CN/Y2019/V55/I12/1537

图1 AZ91镁合金粉末和CNTs微观组织

图2 CNTs、AZ91及0.1%CNTs/AZ91复合材料的XRD谱

图3 挤压态AZ91基体合金和0.1%CNTs/AZ91复合材料的TEM像及晶粒尺寸分布

图4 CNTs及Mg17Al12在0.1%CNTs/AZ91复合材料中的分布及界面微观组织

图5 挤压态AZ91基体合金和0.1%CNTs/AZ91复合材料的{0001}面和{101ˉ0}面宏观织构

图6 挤压态AZ91合金及0.1%CNTs/AZ91复合材料的室温压缩性能和室温拉伸性能

表1 相关镁基复合材料室温力学性能[7,11,18,19,33,34]

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