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
收稿日期: 2022-02-14
修回日期: 2022-09-19
网络出版日期: 2022-09-30
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)
Mechanical Properties and Deformation Behavior of a Nanostructured Aluminum Alloy Toughened by Titanium Alloy Base Three-Dimensional Lattice Structure
Received date: 2022-02-14
Revised date: 2022-09-19
Online published: 2022-09-30
Supported by
National Key Research and Development Program of China(2020YFB2008300);National Key Research and Development Program of China(2020YFB2008301);National Key Research and Development Program of China(2020YFB2008305);Natural Science Foundation of Guangdong Province(2023A-1515011569);High-End Foreign Experts Recruitment Program(G2021163004L);Guangdong International Science and Technology Cooperation Program(2021A05-05050002)
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。
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 . DOI: 10.11900/0412.1961.2022.00046
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.
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