Effects of different additives on microstructure and properties of Al–Zn–Mg–Cu alloys prepared by laser-directed energy deposition

IF 4.8 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Progress in Natural Science: Materials International Pub Date : 2024-01-23 DOI:10.1016/j.pnsc.2023.12.002

Yin Wang, Yong Li, Wei Yu, Chen He, Haiyao Wang, Guangming Xu, Jiadong Li

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Abstract

There are always microcracks and pores during the laser additive manufacturing of 7xxx aluminum alloy, which significantly limits its performance improvement and application. This work uses additives to suppress defects and improve the alloy's properties. Here three alloys were prepared by the addition of silicon, TiN, or both. Their microstructure and mechanical properties were investigated in detail. The results show that silicon can inhibit the crack generation by reducing the solidification rate. The grain size is large. TiN can refine the grain and it creates pores. The addition of both can restrain the defects, refine the grains and obtain good comprehensive properties. Moreover, the hardness and wear resistance of A3 are slightly lower than A2 due to the brittle phase generated by the addition of Si. The yield strength, tensile strength, elongation, hardness and wear rate of A3 alloy treated by T6 are 214.8 MPa, 262.8 MPa, 2.59 %, 130.9 HV and 2.24 × 10⁻³ mm³/(N·m).

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不同添加剂对激光定向能沉积制备的铝锌镁铜合金微观结构和性能的影响

7xxx 铝合金在激光增材制造过程中总会出现微裂纹和气孔，这极大地限制了其性能的提高和应用。这项工作利用添加剂来抑制缺陷，改善合金的性能。通过添加硅、TiN 或两者，制备了三种合金。对它们的微观结构和机械性能进行了详细研究。结果表明，硅可以通过降低凝固速率来抑制裂纹的产生。晶粒尺寸较大。TiN 可以细化晶粒并产生气孔。二者的添加可以抑制缺陷，细化晶粒，获得良好的综合性能。此外，A3 的硬度和耐磨性略低于 A2，这是由于添加 Si 后产生了脆性相。经 T6 处理的 A3 合金的屈服强度、抗拉强度、伸长率、硬度和磨损率分别为 214.8 MPa、262.8 MPa、2.59 %、130.9 HV 和 2.24 × 10-3 mm3/（N-m）。

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来源期刊

Progress in Natural Science: Materials International 综合性期刊-综合性期刊

CiteScore

8.60

自引率

2.10%

发文量

2812

审稿时长

49 days

期刊介绍： Progress in Natural Science: Materials International provides scientists and engineers throughout the world with a central vehicle for the exchange and dissemination of basic theoretical studies and applied research of advanced materials. The emphasis is placed on original research, both analytical and experimental, which is of permanent interest to engineers and scientists, covering all aspects of new materials and technologies, such as, energy and environmental materials; advanced structural materials; advanced transportation materials, functional and electronic materials; nano-scale and amorphous materials; health and biological materials; materials modeling and simulation; materials characterization; and so on. The latest research achievements and innovative papers in basic theoretical studies and applied research of material science will be carefully selected and promptly reported. Thus, the aim of this Journal is to serve the global materials science and technology community with the latest research findings. As a service to readers, an international bibliography of recent publications in advanced materials is published bimonthly.

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