激光选区熔化高强度和高热稳定性TiB<sub>2</sub>改性Al–Mn–Mg–Er–Zr铝合金

于江; 耿遥祥; 陈永康; 王肖; 张志杰; 唐浩; 许俊华; 鞠洪博; 王冬鹏

doi:10.1007/s12613-024-2879-7

Volume 31 Issue 10

Oct. 2024

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文章导航 > 矿物冶金与材料学报（英文） > 2024 > 31(10): 2221-2232

Jiang Yu, Yaoxiang Geng, Yongkang Chen, Xiao Wang, Zhijie Zhang, Hao Tang, Junhua Xu, Hongbo Ju, and Dongpeng Wang, High-strength and thermally stable TiB₂-modified Al–Mn–Mg–Er–Zr alloy fabricated via selective laser melting, Int. J. Miner. Metall. Mater., 31(2024), No. 10, pp. 2221-2232. https://doi.org/10.1007/s12613-024-2879-7

Cite this article as:

Jiang Yu, Yaoxiang Geng, Yongkang Chen, Xiao Wang, Zhijie Zhang, Hao Tang, Junhua Xu, Hongbo Ju, and Dongpeng Wang, High-strength and thermally stable TiB2-modified Al–Mn–Mg–Er–Zr alloy fabricated via selective laser melting, Int. J. Miner. Metall. Mater., 31(2024), No. 10, pp. 2221-2232. https://doi.org/10.1007/s12613-024-2879-7

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研究论文

激光选区熔化高强度和高热稳定性TiB₂改性Al–Mn–Mg–Er–Zr铝合金

1)
江苏科技大学材料科学与工程学院, 镇江 212003, 中国
2)
北京科技大学新材料技术研究院, 北京材料基因工程高精尖创新中心, 北京 100083, 中国
3)
华南理工大学大学国家金属材料近净成型工程技术研究中心, 广东省金属新材料制备与成形重点实验室, 广州 510640, 中国
4)
CEMMPRE-Centre for Mechanical Engineering Materials and Processes, Department of Mechanical Engineering, University of Coimbra, Rua Luís Reis Santos, Coimbra 3030-788, Portugal

通讯作者:
耿遥祥 E-mail: yaoxianggeng@163.com

文章亮点

(1) 系统地研究了激光选区熔化成形TiB₂/Al–Mn–Mg–Er–Zr合金的成形性、组织和力学性能

(2) 开发了高强度和高热稳定性的激光选区熔化铝合金新体系

(3) 分析了新合金的强化和热稳定性机理

中文摘要

激光选区熔化（SLM）技术可实现复杂精密金属零部件的一次性快速成形，基于该技术，通过零件结构的拓扑优化及多零件的整合成形，可有效降低零部件的重量并提升其性能。铝合金广泛应用于航空航天等领域重要零部件的制造，然而目前获得广泛应用的SLM成形铝合金主要集中在Al–Si系铸造合金成分，但其强度较低。SLM成形Sc和Zr改性的Al–Mg和Al–Mn系铝合金的力学性能优异，但合金中包含较多的Sc元素，原料成本高昂。通过Er替代Sc可有效降低合金的原料成本，但会恶化合金的SLM成形性。为提升含Er铝合金的SLM成形性，本文通过TiB₂纳米颗粒对Al–Mn–Mg–Er–Zr合金进行成分改性，通过合金的表面形貌和显微组织观察、相结构鉴定和力学性能测试等试验手段系统研究了SLM成形TiB₂/Al–Mn–Mg–Er–Zr合金成形性及时效处理对合金微观组织和力学性能的影响。研究结果表明，由于均匀光滑的上表面和合适的激光能量输入，使得在250 W激光功率下成形的合金具有更高的相对密度，合金相对密度的最大值为(99.7 ± 0.1)%，表现出良好的SLM成形性。合金具有柱状晶-等轴晶双峰晶粒分布，在晶界处存在TiB₂纳米颗粒、Al₆Mn和Al₃Er纳米析出相。沉积态合金经400°C直接时效处理后，由于α-Al基体中大量二次Al₆Mn相的析出，从而有效提升了合金的强度。经400°C时效处理4 h后，合金的屈服强度和极限抗拉强度具有最大值，分别为（374 ± 1）和（512 ± 13）MPa。晶粒的抑制生长、高热稳定性TiB₂纳米颗粒的存在和二次Al₆Mn的时效析出共同使得SLM成形TiB₂改性Al–Mn–Mg–Er–Zr合金具有优异的强度和热稳定性。

关键词:

Research Article

High-strength and thermally stable TiB₂-modified Al–Mn–Mg–Er–Zr alloy fabricated via selective laser melting

+ Author Affiliations

1)
School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, China
2)
Beijing Advanced Innovation Center for Materials Genome Engineering, Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China
3)
National Engineering Research Center of Near-Net Shape Forming for Metallic Materials, Guangdong Provincial Key Laboratory for Processing and Forming of Advanced Metallic Materials, South China University of Technology, Guangzhou 510640, China
4)
CEMMPRE-Centre for Mechanical Engineering Materials and Processes, Department of Mechanical Engineering, University of Coimbra, Rua Luís Reis Santos, Coimbra 3030-788, Portugal

The authors declare that they have no conflicts of interest to this work.

Corresponding author:
Yaoxiang Geng E-mail: yaoxianggeng@163.com
Received: 18 November 2023; Revised: 7 March 2024; Accepted: 7 March 2024; Available online: 9 March 2024

Abstract

Abstract

To increase the processability and plasticity of the selective laser melting (SLM) fabricated Al–Mn–Mg–Er–Zr alloys, a novel TiB₂-modified Al–Mn–Mg–Er–Zr alloy with a mixture of Al–Mn–Mg–Er–Zr and nano-TiB₂ powders was fabricated by SLM. The processability, microstructure, and mechanical properties of the alloy were systematically investigated by density measurement, microstructure characterization, and mechanical properties testing. The alloys fabricated at 250 W displayed higher relative densities due to a uniformly smooth top surface and appropriate laser energy input. The maximum relative density value of the alloy reached (99.7 ± 0.1)%, demonstrating good processability. The alloy exhibited a duplex grain microstructure consisting of columnar regions primarily and equiaxed regions with TiB₂, Al₆Mn, and Al₃Er phases distributed along the grain boundaries. After directly aging treatment at a high temperature of 400°C, the strength of the SLM-fabricated TiB₂/Al–Mn–Mg–Er–Zr alloy increased due to the precipitation of the secondary Al₆Mn phases. The maximum yield strength and ultimate tensile strength of the aging alloy were measured to be (374 ± 1) and (512 ± 13) MPa, respectively. The SLM-fabricated TiB₂/Al–Mn–Mg–Er–Zr alloy demonstrates exceptional strength and thermal stability due to the synergistic effects of the inhibition of grain growth, the incorporation of TiB₂ nanoparticles, and the precipitation of secondary Al₆Mn nanoparticles.
- selective laser melting;
- aluminum alloy;
- processability;
- mechanical properties;
- thermal stability

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激光选区熔化高强度和高热稳定性TiB₂改性Al–Mn–Mg–Er–Zr铝合金

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High-strength and thermally stable TiB₂-modified Al–Mn–Mg–Er–Zr alloy fabricated via selective laser melting

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激光选区熔化高强度和高热稳定性TiB2改性Al–Mn–Mg–Er–Zr铝合金

文章亮点

中文摘要

High-strength and thermally stable TiB2-modified Al–Mn–Mg–Er–Zr alloy fabricated via selective laser melting

Abstract

References

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Catalog

激光选区熔化高强度和高热稳定性TiB₂改性Al–Mn–Mg–Er–Zr铝合金

High-strength and thermally stable TiB₂-modified Al–Mn–Mg–Er–Zr alloy fabricated via selective laser melting