Effect of Zr content on formability, microstructure and mechanical properties of selective laser melted Zr modified Al-4.24Cu-1.97Mg-0.56Mn alloys

Nie, Xiaojia; Zhang, Hu; Zhu, Haihong; Hu, Zhiheng; Liu, Ke; Zeng, Xiaoyan

doi:10.1016/j.jallcom.2018.06.032

Cited by 166 publications

(43 citation statements)

References 47 publications

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“…Further experiments, based on a study conducted by Zhang et al [18], have shown the possibility of fabricating crack-free samples by addition of up to 2.5 wt.% zirconium due to grain refinement achieving a mainly globular grain structure. Furthermore, the scanning speed could be increased by factor of 3 without the occurrence of cracks, though reduced relative densities were observed [19]. Tensile testing of the unmodified specimens showed slightly lower yield strength (YS) and ultimate tensile strength (UTS) as commonly manufactured EN AW-2024 in T3 and T6 condition.…”

Section: Mechanical Propertiesmentioning

confidence: 96%

Grain Structure Evolution of Al–Cu Alloys in Powder Bed Fusion with Laser Beam for Excellent Mechanical Properties

Rasch¹,

Heberle

Dechet³

et al. 2019

Materials

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Powder Bed Fusion with Laser Beam of Metals (PBF-LB/M) is one of the fastest growing technology branches. More and more metallic alloys are being qualified, but processing of aluminum wrought alloys without cracks and defects is still challenging. It has already been shown that small parts with low residual porosity can be produced. However, suffering from microscopic hot cracks, the fracture behavior has been rather brittle. In this paper different combinations of temperature gradients and solidification rates are used to achieve specific solidification conditions in order to influence the resulting microstructure, as well as internal stresses. By this approach it could be shown that EN AW-2024, an aluminum-copper wrought alloy, is processable via PBF-LB/M fully dense and crack-free with outstanding material properties, exceeding those reported for commonly manufactured EN AW-2024 after T4 heat treatment.

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Section: Mechanical Propertiesmentioning

confidence: 96%

Grain Structure Evolution of Al–Cu Alloys in Powder Bed Fusion with Laser Beam for Excellent Mechanical Properties

Rasch¹,

Heberle

Dechet³

et al. 2019

Materials

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show abstract

“…In the work of Qi et al [150], on selective laser melting of AA 7050 alloy, for a wide range of scanning speeds (from 150 to 750 mm/s) cracking was always observed, even though the range of scanning speeds used allowed to transition from conduction to keyhole. Nie et al [192] showed that very low scanning speeds (≈ 80 mm/s) could be used to achieve crack-free parts in AA 2024 alloys. Eventually, the scanning speed could be increased up to ≈ 580 mm/s, though the addition of Zr was required to promote grain refinement and decrease cracking susceptibility.…”

Section: In Additive Manufacturingmentioning

confidence: 99%

“…As described before, microalloying is an effective way to decrease cracking susceptibility and increase the mechanical properties of Aluminum alloys. Nie et al [192] demonstrated the importance to precise control Zr microalloying addition during selective laser melting of Al-Cu-Mg: when the amount of Zr increased up to 2 wt.%, the yield and ultimate tensile strength always increased; above 2 wt.% a decrease in mechanical properties was observed. The controlled addition of Zr, via the introduction of Al 3 Zr and ZrO particles, acted as heterogenous nucleation sites, promoting grain refinement, hence justifying the increase in the mechanical properties of the as-built parts.…”

Section: In Additive Manufacturingmentioning

confidence: 99%

Revisiting fundamental welding concepts to improve additive manufacturing: From theory to practice

Oliveira

Santos

Miranda

2020

Progress in Materials Science

467

134

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Additive manufacturing technologies based on melting and solidification have considerable similarities with fusion-based welding technologies, either by electric arc or high-power beams. However, several concepts are being introduced in additive manufacturing which have been extensively used in multipass arc welding with filler material. Therefore, clarification of fundamental definitions is important to establish a common background between welding and additive manufacturing research communities. This paper aims to review these concepts, highlighting the distinctive characteristics of fusion welding that can be embraced by additive manufacturing, namely the nature of rapid thermal cycles associated to small size and localized heat sources, the non-equilibrium nature of rapid solidification and its effects on: internal defects formation, phase transformations, residual stresses and distortions. Concerning process optimization, distinct criteria are proposed based on geometric, energetic and thermal considerations, allowing to determine an upper bound limit for the optimum hatch distance during additive manufacturing. Finally, a unified equation to compute the energy density is proposed. This equation enables to compare works performed with distinct equipment and experimental conditions, covering the major process parameters: power, travel speed, heat source dimension, hatch distance, deposited layer thickness and material grain size.

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“…Nie et al [ 162 ] studied the effect of Zr on the formability, mechanical properties and microstructure of SLM Al-Cu-Mg-Mn alloys. The addition of Zr to SLM Al-Cu-Mg-Mn alloy was observed to be effective in crack controlling mechanism, grain refinement and in the controlling of mechanical properties.…”

Section: Mechanical Properties Of Slm-printed Aluminium Alloysmentioning

confidence: 99%

Mechanical Properties of SLM-Printed Aluminium Alloys: A Review

et al. 2020

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Selective laser melting (SLM) is a powder bed fusion type metal additive manufacturing process which is being applied to manufacture highly customised and value-added parts in biomedical, defence, aerospace, and automotive industries. Aluminium alloy is one of the widely used metals in manufacturing parts in SLM in these sectors due to its light weight, high strength, and corrosion resistance properties. Parts used in such applications can be subjected to severe dynamic loadings and high temperature conditions in service. It is important to understand the mechanical response of such products produced by SLM under different loading and operating conditions. This paper presents a comprehensive review of the latest research carried out in understanding the mechanical properties of aluminium alloys processed by SLM under static, dynamic, different build orientations, and heat treatment conditions with the aim of identifying research gaps and future research directions.

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Effect of Zr content on formability, microstructure and mechanical properties of selective laser melted Zr modified Al-4.24Cu-1.97Mg-0.56Mn alloys

Cited by 166 publications

References 47 publications

Grain Structure Evolution of Al–Cu Alloys in Powder Bed Fusion with Laser Beam for Excellent Mechanical Properties

Grain Structure Evolution of Al–Cu Alloys in Powder Bed Fusion with Laser Beam for Excellent Mechanical Properties

Revisiting fundamental welding concepts to improve additive manufacturing: From theory to practice

Mechanical Properties of SLM-Printed Aluminium Alloys: A Review

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