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Strengthening mechanisms of high-performance Al-Mn-Mg-Sc-Zr alloy fabricated by selective laser melting

选区激光熔化成形高性能Al-Mn-Mg-Sc-Zr合金的 时效强化机理

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摘要

针对当前应用选区激光熔化(SLM)成形铝合金强度较低的 缺点, 本研究基于SLM技术熔体快速冷却的技术特性, 通过提升Al-Mn-Mg-Sc-Zr合金中合金化元素的含量, 设计高(Mg+Mn)和高(Sc +Zr)含量的SLM专用铝合金, 系统研究了合金的SLM成形性及时效 处理对合金组织和力学性能的影响. 结果表明, 新合金具有优异的 SLM成形性, 最大相对致密度可达99.82%. SLM成形合金具有细小 等轴晶-柱状晶双峰结构. 等轴晶晶界处有Al6Mn和Al3(Sc,Zr)纳米 颗粒析出, 而柱状晶晶界处只存在Al6Mn纳米颗粒, 这些高稳定性 纳米颗粒可有效抑制合金在时效处理过程中的回复再结晶. 经 300°C时效处理后, 样品的力学性能获得较大程度的提升, 其屈服 强度和抗拉强度均超过600 MPa, 是现有已报道SLM成形铝合金的 最高值, 并且保持较好的延伸率. 细晶强化、固溶强化和Al3Sc纳米 颗粒析出强化的共同作用, 是Al-Mn-Mg-Sc-Zr合金具有高强度的 主要原因.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (51801079 and 52001140), and the Natural Science Foundation for Young Scientists of Jiangsu, China (BK20180985 and BK20180987).

Author information

Authors and Affiliations

  1. School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang, 212003, China

    Yaoxiang Geng  (耿遥祥), Hao Tang  (唐浩), Junhua Xu  (许俊华) & Zhijie Zhang  (张志杰)

  2. State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai, 200240, China

    Yakai Xiao  (肖亚开) & Yi Wu  (吴一)

Authors
  1. Yaoxiang Geng  (耿遥祥)
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  2. Hao Tang  (唐浩)
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  3. Junhua Xu  (许俊华)
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  4. Zhijie Zhang  (张志杰)
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  5. Yakai Xiao  (肖亚开)
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  6. Yi Wu  (吴一)
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Contributions

Geng Y and Xu J conceived the idea and wrote the paper. Tang H and Zhang Z performed the experiments. Xiao Y and Wu Y conducted the tensile testing. All authors contributed to the general discussion.

Corresponding authors

Correspondence to Yaoxiang Geng  (耿遥祥) or Junhua Xu  (许俊华).

Additional information

Yaoxiang Geng is an associate professor at the School of Materials Science and Engineering, Jiangsu University of Science and Technology (China). He received his PhD degree in materials science (2016) from the School of Materials Science and Engineering, Dalian University of Technology (DUT). His research focuses on composition design and properties investigation of special aluminum alloys for selective laser melting and amorphous and nanocrystalline alloys.

Junhua Xu is a professor of the School of Materials Science and Engineering, Jiangsu University of Science and Technology (China). He received his PhD degree in materials science (2000) from the School of Materials Science and Engineering, Shanghai Jiao Tong University. His research focuses on thin film technologies and application of materials, composition design and property investigation of special aluminum alloys for selective laser melting.

Conflict of interest

The authors declare that they have no conflict of interest.

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Geng, Y., Tang, H., Xu, J. et al. Strengthening mechanisms of high-performance Al-Mn-Mg-Sc-Zr alloy fabricated by selective laser melting. Sci. China Mater. 64, 3131–3137 (2021). https://doi.org/10.1007/s40843-021-1719-8

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  • DOI: https://doi.org/10.1007/s40843-021-1719-8

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