Influence of alloying elements on laser powder bed fusion processability of aluminum: A new insight into the oxidation tendency

Ghasemi, Ali; Fereiduni, Eskandar; Balbaa, Mohamed; Jadhav, Suraj Dinkar; Elbestawi, M.A.; Habibi, Saeid

doi:10.1016/j.addma.2021.102145

Cited by 16 publications

(6 citation statements)

References 57 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The occurrence of such reactions despite the low oxygen content during LBM is a common challenge, specifically for the processing of alloys with reactive elements [73][74][75]79]. When this slag is incorporated into the material it can weaken the mechanical properties [76,78]. In the present case, the investigated material contained slag only in combination with AgCaLa phases which did not contribute to the load capacity.…”

Section: Generation Of Slag and Chemical Composition Of Agcalamentioning

confidence: 85%

“…Aside from the physical effects, the chemical properties of the reactivity of the processed material influence the LBM process, as elements with high reactivity can react with each other or with the remaining oxygen within the building chamber [73][74][75]. As the reactivity increases with temperature, the chemical reactions can be so distinctive that developed oxides deteriorate the connection between adjacent and superimposed melt tracks [73,74,76,77]. Additionally, slag positioned on the top can be incorporated into the bulk material, deteriorating the mechanical properties [74,78,79].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Adjustment of AgCaLa Phases in a FeMn Matrix via LBM for Implants with Adapted Degradation

Krüger

2022

Crystals

View full text Add to dashboard Cite

For many applications, implants overtake body function for a certain time. Bioresorbable implants reduce patient burden as they prevent adverse consequences due to remaining implants or operations for removal. Such materials are in clinical use but do not fulfill the requirements of all applications. Iron (Fe) is promising to develop further bioresorbable materials as it offers biocompatibility and good mechanical properties. Alloying, e.g., with manganese (Mn), is necessary to adapt the mechanical behavior and the degradation rate. However, the degradation rate of FeMn is too low. The creation of phases with high electrochemical potential evokes anodic dissolution of the FeMn, increasing the degradation rate. Therefore, silver (Ag), which is insoluble with Fe, has high potential, is biocompatible, and offers antibacterial properties, can be used. Powder-based processes such as laser beam melting (LBM) are favorable to process such immiscible materials. A degradable Ag alloy has to be used to enable the dissolution of Ag phases after the FeMn. This study reports first about the successful processing of FeMn with 5 wt.% of a degradable Ag–calcium–lanthanum (AgCaLa) alloy and enables further targeted adaption due to the gained understanding of the effects influencing the morphology and the chemical composition of the Ag phases.

show abstract

Section: Generation Of Slag and Chemical Composition Of Agcalamentioning

confidence: 85%

Section: Introductionmentioning

confidence: 99%

Adjustment of AgCaLa Phases in a FeMn Matrix via LBM for Implants with Adapted Degradation

Krüger

2022

Crystals

View full text Add to dashboard Cite

show abstract

“…Powder particles that are not well bonded will bounce off and fall over the solidified melt pool, seriously affecting the process efficiency and causing workpiece pollution. However, Ghasemi et al [60] found that the oxide levels in LPBF processed pure Al, AlSi12, and AlSi10Mg are all reduced compared with the raw powders, suggesting a higher oxygen release than oxygen involvement from oxidation. However, this has not been substantiated in LDED Al alloys.…”

Section: High Oxidation Sensitivity and Hydrophilicitymentioning

confidence: 99%

Review on laser directed energy deposited aluminum alloys

Liu,

Chen,

Qiu

et al. 2024

Int. J. Extrem. Manuf.

View full text Add to dashboard Cite

The lightweight aluminum (Al) alloys have been widely used in frontier fields like aerospace and automotive industries, which attracts great interest in additive manufacturing to process high-value Al parts. As a mainstream additive manufacturing technique, laser directed energy deposition (LDED) shows good scalability to meet requirements for large-format components manufacturing and repairing. However, LDED Al alloys are highly challenging due to the inherent poor printability (e.g., low laser absorption, high oxidation sensitivity and cracking tendency). To further promote the development of LDED high-performance Al alloys, this review gains a deep understanding of the challenges and strategies to improve printability in LDED Al alloys. The porosity, cracking, distortion, inclusions, elements evaporation and resultant inferior mechanical properties (than laser powder bed fusion) are the key challenges in LDED Al alloys. Processing parameter optimizations, in-situ alloy design, reinforcing particle addition and field assistance are the efficient approaches to improve the printability and performance of LDED Al alloys. The underlying correlations between processes, alloy innovation, characteristic microstructures, and achievable performances in LDED Al alloys are discussed. The benchmarking mechanical properties and primary strengthening mechanism of LDED Al alloys are summarized. This review aims to provide a critical and in-depth evaluation of current progress in LDED Al alloys. The future opportunities and perspectives in LDED high-performance Al alloys are also outlooked.

show abstract

“…Upon solidification, each consolidated layer then serves as a new substrate for the subsequent powder layer Figure 1a. The process repeats in this fashion until the entire component is built [24][25][26]. Figure 1b shows the process parameters in the LPBF process.…”

Section: Processmentioning

confidence: 99%

Laser Powder Bed Fusion of Unalloyed Tungsten: A Review of Process, Structure, and Properties Relationships

Seyam

Koshy

Elbestawi

2022

Metals

View full text Add to dashboard Cite

Tungsten (W) as a structural component has grown roots in many special applications owing to its radiation-shielding capabilities and its properties at elevated temperatures. The high ductile-brittle transition temperature (DBTT) and the very high melting point of tungsten however have limited its processability to certain technologies such as powder metallurgy. Laser powder bed fusion (LPBF) has been introduced in recent years as an alternative for manufacturing tungsten parts to overcome the design limitations posed by powder metallurgy technology. A review of the literature shows significant improvements in the quality of tungsten components produced by LPBF, implying a strong potential for manufacturing tungsten with this technology and a need for further research on this subject. This review paper presents the current state-of-the-art in LPBF of unalloyed tungsten, with a focus on the effect of process parameters on the developed structure/properties and identifies current knowledge gaps.

show abstract

Influence of alloying elements on laser powder bed fusion processability of aluminum: A new insight into the oxidation tendency

Cited by 16 publications

References 57 publications

Adjustment of AgCaLa Phases in a FeMn Matrix via LBM for Implants with Adapted Degradation

Adjustment of AgCaLa Phases in a FeMn Matrix via LBM for Implants with Adapted Degradation

Review on laser directed energy deposited aluminum alloys

Laser Powder Bed Fusion of Unalloyed Tungsten: A Review of Process, Structure, and Properties Relationships

Contact Info

Product

Resources

About