Influence of erbium addition on the defects of selective laser-melted 7075 aluminium alloy

Zhang, Xuhui; Xiao, Zhen; Yu, Wenhui; Chua, Chee Kai; Zhu, Lihua; Wang, Zongshen; Xue, Peng; Tan, Shuai; Wu, Yongling

doi:10.1080/17452759.2021.1990358

Cited by 42 publications

(7 citation statements)

References 52 publications

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“…Therefore, a lot of efforts have been made to refine grains to prevent hot cracking and enhance the mechanical property isotropy. Adding solute atoms as nuclei to promote equiaxed grain formation has been widely explored in aluminum alloys and titanium alloys [14,[209][210][211]. However, in nickel-based alloys and steels, the inoculation treatment is not a common practice due to the lack of knowledge of the inoculants [103].…”

Section: Grain Refinementmentioning

confidence: 99%

Alloy design for laser powder bed fusion additive manufacturing: a critical review

Liu,

Zhou,

Liang

et al. 2024

Int. J. Extrem. Manuf.

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Metal additive manufacturing (AM) has been extensively studied in recent decades. Despite the significant progress achieved in manufacturing complex shapes and structures, challenges such as severe cracking when using existing alloys for laser powder bed fusion (L-PBF) AM persisted. This is due to the fact that commercial alloys are primarily designed for conventional casting or forging processes, without considering the fast cooling rates, steep temperature gradients, and multiple thermal cycles of L-PBF. To address this, there is an urgent need to develop novel alloys specifically tailored for L-PBF technologies. This review provides a comprehensive summary of the strategies employed in alloy design for L-PBF. It aims to guide future research on designing novel alloys dedicated to L-PBF instead of adapting the existing alloys for L-PBF. The review begins by discussing the features of L-PBF processes, focusing on rapid solidification and intrinsic heat treatment. Next, the printability of the four main existing alloys (Fe-, Ni-, Al-, and Ti-based alloys) is critically assessed, with a comparison to their conventional weldability. It was found that the weldability criteria are not always applicable in estimating printability. Furthermore, the review presents recent advances in alloy development and associated strategies, categorizing them into crack mitigation-oriented, microstructure manipulation-oriented, and machine learning-assisted approaches. Lastly, an outlook and suggestions are given to highlight the issues that need be addressed in future work.

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Section: Grain Refinementmentioning

confidence: 99%

Alloy design for laser powder bed fusion additive manufacturing: a critical review

Liu,

Zhou,

Liang

et al. 2024

Int. J. Extrem. Manuf.

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“…Among these refining methods, adding inoculants to aluminum alloy melt is the most simple and effective method. The inoculants of aluminum alloy mainly include some alloying elements and ceramic particles [11][12][13][14]. Alloying elements usually play a role in heterogeneous nucleation of Al matrix by forming intermetallic compounds with Al.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Al3Ti-Al2O3/Al Inoculant and Its Inoculation Effect on Al-Cu-Mn Alloy

Ding

Wang

et al. 2023

Materials

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The grain size plays a pivotal role in determining the properties of the alloy. The grain size can be significantly decreased by adding inoculants. Aiming to address the shortcomings of existing inoculants, the Al3Ti-Al2O3/Al inoculant was successfully prepared using Al-Ti master alloy and Al2O3 whiskers as raw materials. With the aid of ultrasonic energy, the Al2O3 whiskers were uniformly dispersed within the inoculants. Under the combined action of ultrasonic and titanium, the Al2O3 whiskers were broken into small particles at high temperature. To enhance the morphology of Al3Ti and achieve even particle dispersion throughout the matrix, vacuum rapid quenching treatment was applied to the inoculant. The SEM test results indicated a significant reduction in particle size after vacuum rapid quenching. The Al3Ti-Al2O3/Al inoculants exhibited excellent grain refinement effects on the weldable Al-Cu-Mn alloy. Crystallographic calculations and HRTEM analysis revealed that Al2O3 and Al have orientation relationships, indicating their potential as effective heterogeneous nucleation sites. The mechanical properties of the Al-Cu-Mn alloy were obviously improved after the Al3Ti-Al2O3/Al inoculant was added.

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“…In addition, the high energy concentration density inevitably causes oxidation and burnout of metals. Therefore, the fusionbased additive manufacturing technology cannot meet the requirements of small deformation, low residual stress and high additive e ciency of the workpiece [4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Effect of rotational speed and feed rate on microstructure and mechanical properties of 6061 aluminum alloy manufactured by additive friction stir deposition

Chen

et al. 2023

Int J Adv Manuf Technol

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Additive friction stir deposition(AFSD) is attractive for its ability to create freeform and fully-dense structures without melting and solidi cation. Hence, additive friction stir deposition is an alternative to fusion-based additive manufacturing technology. In this study, the in uence of AFSD parameter (i.e. rotational speed and feed rate) on the mechanical properties and microstructure of 6061 aluminum alloy is investigated. The as-deposited 6061 aluminum alloy exhibits relatively homogeneous microstructure with extensive equiaxed grains. Compared to the base material, the ultimate tensile strength is ranged from 320 MPa to 210MPa, decreasing to 65% of the feedstock material. The grain boundary misorientation distribution indicates that continuous dynamic recrystallization occurs during the AFSD process. Furthermore, it is evidence that the grain size and ultimate tensile strength are positive correlated with feed rate and rotational speed, whereas the elongation at break decreases with the increase in feed rate and rotational speed.

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Influence of erbium addition on the defects of selective laser-melted 7075 aluminium alloy

Cited by 42 publications

References 52 publications

Alloy design for laser powder bed fusion additive manufacturing: a critical review

Alloy design for laser powder bed fusion additive manufacturing: a critical review

Preparation of Al3Ti-Al2O3/Al Inoculant and Its Inoculation Effect on Al-Cu-Mn Alloy

Effect of rotational speed and feed rate on microstructure and mechanical properties of 6061 aluminum alloy manufactured by additive friction stir deposition

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