Anisotropic high cycle fatigue property of Sc and Zr-modified Al-Mg alloy fabricated by laser powder bed fusion

Qin, Zehao; Kang, Nan; Mansori, Mohamed El; Wang, Zihong; Wang, Haoxiang; Lin, Xin; Chen, Jing; Huang, Weidong

doi:10.1016/j.addma.2021.102514

Cited by 9 publications

(3 citation statements)

References 79 publications

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“…Wang et al [ 34 ] reported that the microhardness value of coarse grain is lower than that of fine grain regions of the LPBF‐fabricated Al–Mg–Sc–Zr alloy. Qin et al [ 35 ] found that in Al‐Mg alloy, the coarser columnar grains have lower hardness values, while the smaller equiaxed grains have higher hardness values. For titanium alloy, as reported by Chen et al, [ 7 ] the fine α lath corresponds to the high hardness for titanium alloy, which was also confirmed in the current study.…”

Section: Discussionmentioning

confidence: 99%

Microstructural Inhomogeneity and Mechanical Properties of Ti–6.4Al–3.3Mo–1.6Zr–0.2Si Alloy Fabricated by Laser Metal Deposition

Yang

Cai³

et al. 2023

Adv Eng Mater

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Laser metal deposition (LMD) additive manufacturing has gained growing interest in the aerospace industry. Herein, a Ti–6.4Al–3.3Mo–1.6Zr–0.2Si (TC11) titanium alloy is produced by LMD. The inhomogeneity of multiscale grain morphology and mechanical properties are systematically investigated. The results indicate that the melting pool (MP) morphology can be divided into three areas: melting pool center (MPC), melting pool boundary (MPB), and heat‐affected zone (HAZ), respectively. The widths of α laths in MPB are larger than that in HAZ and MPC, which result in a lower microhardness in MPB than that in MPC. Besides, the columnar grains are generally distributed along the deposition direction. The average widths of the α laths in the top and bottom MPC regions are about 0.58 and 0.67 μm, respectively. Correspondingly, the ultimate tensile strength and fracture elongation of the top and bottom samples are 1,053.5 MPa, 16.7%, and 1,011.5 MPa, 20.7%, respectively, which suggest the inhomogeneity of mechanical properties. The initiation fracture sites of both the top and bottom samples are presumed to be the α lath inside the MPB according to stress distribution analysis. The formation mechanisms of inhomogeneous grain structures and their influences on mechanical performance are also discussed.

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Section: Discussionmentioning

confidence: 99%

Microstructural Inhomogeneity and Mechanical Properties of Ti–6.4Al–3.3Mo–1.6Zr–0.2Si Alloy Fabricated by Laser Metal Deposition

Yang

Cai³

et al. 2023

Adv Eng Mater

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“…Al-Mg-Sc-Zr alloy fabricated by LPBF shows a bimodal microstructure composed of fine equiaxed grains (EGs) and coarse columnar grains, [8,25,28,29] and some studies [19,[30][31][32] have shown that this microstructure is beneficial to improve the material properties. He et al [29] prepared a Sc/Zr-modified 5024 aluminum alloy with fatigue strength of 105 MPa after HIP (325 °C/100 MPa for 4 h) and studied the dynamic strain aging (DSA) phenomenon found in as-built and heat-treated The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/adem.202300352.…”

Section: Introductionmentioning

confidence: 99%

“…In recent years, some reports about fatigue performances of aluminum alloys mainly are focused on Al–Si and Al–Mg alloys, including effects of building directions, [ 17,18 ] defects, [ 19–21 ] and posttreatment. [ 22–24 ] Qin et al [ 25–27 ] reported certain anisotropy of LPBF‐processed Al–Mg–Sc–Zr alloy, that is, the transverse deposition sample (100.5 MPa) showed better fatigue strength than parallel deposition sample (57 MPa). There are two kinds of defects: LoFs and pores, reducing the fatigue life.…”

Section: Introductionmentioning

confidence: 99%

High Cycle Fatigue Property of Al–Mg–Sc–Zr Alloy Fabricated by Laser Powder Bed Fusion

et al. 2023

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Laser powder bed fusion (LPBF) of high‐strength Al–Mg–Sc–Zr alloy possesses great potential application in the aerospace industry. However, fatigue performance has become a very important issue in the safety and durability design of engineering structures. Herein, the high cycle fatigue property of LPBF‐fabricated Al–Mg–Sc–Zr alloy and its correlation with defects, microstructure, and precipitated phases are studied. The LPBF‐manufactured Al–Mg–Sc–Zr alloy appears heterogeneous structure composed of equiaxed grains at the molten pool boundary and columnar grains at the inner of the molten pool. After aging treatment (325 °C/4 h), the nanosized Al3Sc intragranular particles and Mn‐rich intergranular particles are precipitated, leading to more difficult movement of dislocations that favors the fatigue strength. The ultimate tensile strength of the samples after aging treatment is 507.05 MPa and corresponding 107 cycle fatigue strength (R = −1) is 106 MPa. The fracture morphology of the fatigue specimens shows that the fatigue cracks start from the surface defects with strong stress concentration, especially the lack of fusions, and then expand through the surplus part.

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Recent progress on the control strategies of microstructure and mechanical properties of LPBF-printed aluminum alloys

Wang,

Zou

et al. 2024

Int J Adv Manuf Technol

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Anisotropic high cycle fatigue property of Sc and Zr-modified Al-Mg alloy fabricated by laser powder bed fusion

Cited by 9 publications

References 79 publications

Microstructural Inhomogeneity and Mechanical Properties of Ti–6.4Al–3.3Mo–1.6Zr–0.2Si Alloy Fabricated by Laser Metal Deposition

Microstructural Inhomogeneity and Mechanical Properties of Ti–6.4Al–3.3Mo–1.6Zr–0.2Si Alloy Fabricated by Laser Metal Deposition

High Cycle Fatigue Property of Al–Mg–Sc–Zr Alloy Fabricated by Laser Powder Bed Fusion

Recent progress on the control strategies of microstructure and mechanical properties of LPBF-printed aluminum alloys

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