钛合金三维点阵结构增韧纳米铝合金的力学性能和变形行为

doi:10.11900/0412.1961.2022.00046

金属学报

2024, Vol. 60

Issue (2): 247-260 DOI: 10.11900/0412.1961.2022.00046

研究论文

本期目录 | 过刊浏览

钛合金三维点阵结构增韧纳米铝合金的力学性能和变形行为

王勇¹^,², 张卫文¹^,², 杨超¹^,², 王智¹^,²(

)

1 华南理工大学机械与汽车工程学院广东省金属新材料制备与成形重点实验室广州 510640
2 华南理工大学机械与汽车工程学院国家金属材料近净成形工程技术研究中心广州 510640

Mechanical Properties and Deformation Behavior of a Nanostructured Aluminum Alloy Toughened by Titanium Alloy Base Three-Dimensional Lattice Structure

WANG Yong¹^,², ZHANG Weiwen¹^,², YANG Chao¹^,², WANG Zhi¹^,²(

)

1 Guangdong Key Laboratory for Advanced Metallic Materials Processing, School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510640, China
2 National Engineering Research Center of Near-Net-Shape Forming for Metallic Materials, School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510640, China

引用本文:

王勇, 张卫文, 杨超, 王智. 钛合金三维点阵结构增韧纳米铝合金的力学性能和变形行为[J]. 金属学报, 2024, 60(2): 247-260.
Yong WANG, Weiwen ZHANG, Chao YANG, Zhi WANG. Mechanical Properties and Deformation Behavior of a Nanostructured Aluminum Alloy Toughened by Titanium Alloy Base Three-Dimensional Lattice Structure[J]. Acta Metall Sin, 2024, 60(2): 247-260.

全文: PDF(5531 KB) HTML

摘要:

韧性差是限制高强度纳米结构铝合金应用的关键问题，本工作旨在结合增材制造点阵结构获得高强韧性。利用增材制造和热挤压制备出TC4三维点阵结构增韧Al₈₄Ni₇Gd₆Co₃纳米结构铝合金的新型复合材料，并对其微观组织、拉伸力学性能和拉伸断裂行为进行了表征和分析。结果表明，复合材料中TC4点阵结构保持完整，界面保持平直清晰，TC4合金中的α相和β相沿着挤压方向拉长形成精细的片条状结构，纳米结构铝合金区域为高体积分数纳米结构化合物相和纳米晶Al。力学性能测试结果表明，TC4三维点阵结构对纳米结构铝合金区域的裂纹萌生和扩展产生了明显的限制效应，使得复合材料获得了良好的拉伸力学性能。

关键词 ：铝合金, 钛合金, 点阵结构, 复合材料, 强韧性

Abstract：

Lightweight structural materials with excellent strength and good ductility are extensively used in engineering applications. Although nanostructured Al alloys have relatively low density and high strength resulting in high specific strength, their application is severely limited due to their poor ductility. Recently, additive manufacturing (AM) techniques have been rapidly developed and complex lattice structures can be manufactured by AM. Here, a new composite containing titanium alloy lattice structure and nanostructured Al alloy was created. Selected laser melting is used to generate the TC4 three-dimensional lattice structure, which is subsequently hot extruded with the high-strength nanostructure Al₈₄Ni₇Gd₆Co₃ aluminum alloy. Tensile mechanical characteristics and fracture behavior were studied. The research results reveal that the TC4 lattice structure in the composite remains intact and the interface remains flat and clear, and the α and β phases are elongated along the extrusion direction to form a fine lamellar structure. There is a significant volume proportion of nanostructured intermetallic phases and nanocrystalline fcc-Al in the nanostructured aluminum alloy areas. The mechanical property test results reveal that the TC4 three-dimensional lattice structure has a clear limiting influence on fracture initiation and propagation in the nanostructured aluminum alloy region, resulting in good comprehensive tensile mechanical properties of the composite.

Key words： aluminum alloy titanium alloy lattice structure composite strengthening and toughing

收稿日期: 2022-02-14

ZTFLH:

TG146

基金资助:国家重点研发计划项目(2020YFB2008300);国家重点研发计划项目(2020YFB2008301);国家重点研发计划项目(2020YFB2008305);广东省自然科学基金项目(2023A-1515011569);高端外国专家引进计划项目(G2021163004L);广东省国际科技合作领域基金项目(2021A05-05050002)

通讯作者: 王智，wangzhi@scut.edu.cn，主要从事铝合金和钛合金的强韧化研究

Corresponding author: WANG Zhi, professor, Tel: (020)87113851, E-mail: wangzhi@scut.edu.cn

作者简介: 王勇，男，1995年生，硕士

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图1 TC4合金粉末和Al84Ni7Gd6Co3非晶合金粉末的SEM像以及TC4点阵结构的示意图、宏观形貌和微观组织(a) SEM image of the TC4 powders (b) SEM image of the Al84Ni7Gd6Co3 amorphous powders(c) schematic of the TC4 lattice (unit: mm) (d) TC4 lattices fabricated by selected laser melting process(e, f) top views of the TC4 lattice after 4 h at 800oC followed by furnace cooling with low (e) and high (f) magnifications

图2 热挤压制备Al84Ni7Gd6Co3/TC4复合材料的示意图(a) cold press (b) hot extrusion(c) hot extruded sample (d) dimension of the tensile sample (unit: mm)

图3 Al84Ni7Gd6Co3/TC4复合材料的XRD谱

图4 Al84Ni7Gd6Co3/TC4复合材料的μ-CT三维重构显微组织图以及孔隙表征(a) 3D morphology (b) 2D projection on y-z plane of the sample(c) pore distributions (d) pore size distributions in the specimen along the extrusion direction

图5 Al84Ni7Gd6Co3/TC4复合材料横截面和纵截面的微观组织(a, b) OM images of the transversal section (a) and longitudinal section (b)(c) BSE-SEM image of the Al84Ni7Gd6Co3 alloy area of transversal section(d, e) SE-SEM images of the TC4 lattice showing the microstructures of the transversal section (d) and longitudinal section (e)

图6 Al84Ni7Gd6Co3/TC4复合材料的界面特征(a, b) low (a) and high (b) magnified SEM images (Inset in Fig.6b shows the EDS results of point 1)(c) EDS line scanning result along line in Fig.6b

图7 Al84Ni7Gd6Co3/TC4复合材料纵截面界面区域的EBSD分析结果(a) SEM image (b) phase distribution map (c) EBSD orientation map(d) EBSD kernel average misorientation (KAM) color map with respect to the geometrically necessary dislocation (GND) density (ρGND)(e) {011¯0} pole figure for α-Ti phase (f) inverse pole figure (IPF) map

图8 Al84Ni7Gd6Co3/TC4复合材料和纯Al84Ni7Gd6Co3纳米结构铝合金的拉伸性能，及本工作和目前报道[24,39~61]的Al/Ti异质异构复合材料的密度与力学性能对比

图9 Al84Ni7Gd6Co3/TC4复合材料的断裂特征(a) μ-CT 3D morphology of the fracture surface(b) morphology and spatial distribution of the micro cracks and volume of cracks along the tensile direction(c, d) low (c) and high (d) magnified SEM images of fractured samples after polishing along longitudinal section

图10 Al84Ni7Gd6Co3/TC4复合材料断口形貌的SEM像

图11 拉伸断裂后纵截面界面区域的EBSD分析(a) SEM image (b) phase distribution map(c) EBSD orientation map (d) EBSD KAM color map with respect to ρGND(e) {011¯0} pole figure for α-Ti phase (f) IPF map

图12 Al84Ni7Gd6Co3/TC4复合材料在拉伸过程中裂纹萌生与扩展示意图(a) early elastic deformation stage (b) initial cracking at the Al84Ni7Gd6Co3 alloy(c) appearance of delamination (d) finally fractured

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