Superior mechanical properties of a selective-laser-melted AlZnMgCuScZr alloy enabled by a tunable hierarchical microstructure and dual-nanoprecipitation

Zhu, Ze‐Lin; Ng, Fern Lan; Seet, H.L.; Lu, Wenjun; Liebscher, Christian; Rao, Ziyuan; Raabe, Dierk; Nai, Mui Ling Sharon

doi:10.1016/j.mattod.2021.11.019

Cited by 134 publications

(33 citation statements)

References 80 publications

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“…Sc and Zr elements are very efficient to refine the grains of the SLM Al alloys. [5,48,49] Wei et al [50] introduced TiC nanoparticles into Ni-based René 104 superalloy to decrease the number of cracks using SLM. Zhang et al [51] and Wang et al [52] described the innovated TiÀCu alloys that possess a very fine structure after AM.…”

Section: Potential Methods For Grain Refinement and Duplex Feature Of...mentioning

confidence: 99%

Selective Laser Melting of 304L and 316L Stainless Steels: A Comparative Study of Microstructures and Mechanical Properties

Zhai

Zhou

Zhu

et al. 2022

steel research int.

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Among various types of stainless steel, 304L and 316L have the most engineering applications. Herein, 304L and 316L powders with similar size distributions and morphologies are used as raw materials for selective laser melting (SLM) using the same parameters. It is found that SLM 304L has two phases, γ-austenite (%95%) and δ-ferrite (%5%) phases, while SLM 316L contains only γ-austenite phase. The average grain size is found to be 4.9 μm (average grain size of γ-austenite phase: 5.0 μm; δ-ferrite: 3.4 μm) for SLM 304L and 16.7 μm for SLM 316L. The small grain size of 304L is attributed to the peritectic reaction during solidification. δ-ferrite acts as a heterogeneous nucleation site for γ-austenite. SLM 316L has higher hardness and yield strength than 304L. Results obtained from the comparative study indicate that adding ferrite stabilizer elements (e.g., Cr, Mo, Si, Nb, or Ti) into 316L can lead to peritectic reaction or austenite to ferrite solid phase transformation, which is a possible approach for grain refinement.

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Section: Potential Methods For Grain Refinement and Duplex Feature Of...mentioning

confidence: 99%

Selective Laser Melting of 304L and 316L Stainless Steels: A Comparative Study of Microstructures and Mechanical Properties

Zhai

Zhou

Zhu

et al. 2022

steel research int.

Self Cite

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“…Z. G. Zhu et al [110] proposed a new aluminum alloy composition design suitable for the SLM process: Al-Zn-Mg-Cu-Sc-Zr. The structure was regulated by the heat treatment process, a microstructure with a multimodal grain heterostructure and a double precipitated phase structure was obtained, and finally, the mechanical characteristics were thoroughly optimized.…”

Section: Composition Design For New Aluminum Alloy Via Slm Processmentioning

confidence: 99%

“…The engineering stress-strain curves of aluminum alloys prepared via SLM under different heat treatment processes, compared with the properties of other types of aluminum alloys. The microstructures of printed and annealed aluminum alloys were analyzed via electron microscope[110].…”

mentioning

confidence: 99%

Recent Progress on Regulating Strategies for the Strengthening and Toughening of High-Strength Aluminum Alloys

Zheng

Pang

et al. 2022

Materials

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Due to their high strength, high toughness, and corrosion resistance, high-strength aluminum alloys have attracted great scientific and technological attention in the fields of aerospace, navigation, high-speed railways, and automobiles. However, the fracture toughness and impact toughness of high-strength aluminum alloys decrease when their strength increases. In order to solve the above contradiction, there are currently three main control strategies: adjusting the alloying elements, developing new heat treatment processes, and using different deformation methods. This paper first analyzes the existing problems in the preparation of high-strength aluminum alloys, summarizes the strengthening and toughening mechanisms in high-strength aluminum alloys, and analyzes the feasibility of matching high-strength aluminum alloys in strength and toughness. Then, this paper summarizes the research progress towards adjusting the technology of high-strength aluminum alloys based on theoretical analysis and experimental verification, including the adjustment of process parameters and the resulting mechanical properties, as well as new ideas for research on high-strength aluminum alloys. Finally, the main unsolved problems, challenges, and future research directions for the strengthening and toughening of high-strength aluminum alloys are systematically emphasized. It is expected that this work could provide feasible new ideas for the development of high-strength and high-toughness aluminum alloys with high reliability and long service life.

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“…Recently, some studies showed that high quality samples of Al-Zn-Mg-Cu (7xxx series) alloys could be successfully fabricated by adding the elements Sc and Zr [12][13][14]. However, the microstructure of the SLMed Al-Zn-Mg-Cu with Sc and Zr additions has not been well characterized, and the effect of Sc and Zr additions on the microstructure heterogeneity has not been well understood.…”

Section: Introductionmentioning

confidence: 99%

The heterogeneous microstructure in an Al-Zn-Mg-Cu-Sc-Zr alloy produced by selective laser melting

Zhu

Pan

et al. 2022

IOP Conf. Ser.: Mater. Sci. Eng.

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Fully dense and crack-free Al-Zn-Mg alloys with Sc and Zr additions were successfully fabricated by selective laser melting. The microstructures of as-built alloys with different Sc and Zr additions were characterized by scanning electron microscopy and transmission electron microscopy. The microstructure was composed of coarse columnar grains without Sc and Zr additions. In contrast, a fine heterogeneous microstructure, consisting of equiaxed grains at the bottom of the melt pool and columnar grains in the remaining volumes, was formed by adding 0.6 wt.% Sc and 0.26 wt.% Zr. In addition, a high density of precipitates was identified as η’ and I-phases that were distributed at grain boundaries and inside grains.

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Superior mechanical properties of a selective-laser-melted AlZnMgCuScZr alloy enabled by a tunable hierarchical microstructure and dual-nanoprecipitation

Cited by 134 publications

References 80 publications

Selective Laser Melting of 304L and 316L Stainless Steels: A Comparative Study of Microstructures and Mechanical Properties

Selective Laser Melting of 304L and 316L Stainless Steels: A Comparative Study of Microstructures and Mechanical Properties

Recent Progress on Regulating Strategies for the Strengthening and Toughening of High-Strength Aluminum Alloys

The heterogeneous microstructure in an Al-Zn-Mg-Cu-Sc-Zr alloy produced by selective laser melting

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