Mechanical Properties of Honeycomb Structured Zr-Based Bulk Metallic Glass Specimens Fabricated by Laser Powder Bed Fusion

Wegner, Jan; Frey, Maximilian; Stiglmair, P; Kleszczynski, Stefan; Witt, Gerd; Busch, Ralf

doi:10.7166/30-3-2265

Cited by 11 publications

(6 citation statements)

References 24 publications

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“…All studies in the literature that investigated the density of AMZ4 samples fabricated via LPBF reported the presence of defects, such as spherical porosities and LoFs, in the final consolidated parts [8,9,13,39,40,[62][63][64]. To the authors' knowledge, such defects can never be eliminated in commercial grade AMZ4 without leading to excessive crystallization.…”

Section: Introductionmentioning

confidence: 87%

Fatigue Performance of an Additively Manufactured Zr-Based Bulk Metallic Glass and the Effect of Post-Processing

Sohrabi

Nasab

Rouxel

et al. 2021

Metals

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Fatigue is the most common cause of failure of mechanical parts in engineering applications. In the current work, we investigate the fatigue life of a bulk metallic (BMG) glass fabricated via additive manufacturing. Specimens fabricated via laser powder-bed fusion (LPBF) are shown to have a fatigue ratio of 0.20 (fatigue limit of 175 MPa) in a three-point bending fatigue test. Three strategies for improving the fatigue behavior were tested, namely (1) relaxation heat treatment, giving a slight fatigue life improvement at high loading conditions (≥250 MPa), (2) laser shock peening, and (3) changing the build orientation, the latter two of which yielded no significant effects. It was found that the presence of lack of fusion (LoF) had the preponderant effect on fatigue resistance of the specimens manufactured. LoF was observed to be a source of stress localization and initiation of cracks. The fatigue life in BMGs fabricated by LPBF is thus primarily influenced by powder quality and process-induced defects, which cannot be removed by the post-treatments carried out in this study. It is believed that a slight increase in laser power, either in the near-surface regions or in the core of the specimens, could improve the fatigue behavior despite the associated (detrimental) increase of crystallized fraction.

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Section: Introductionmentioning

confidence: 87%

Fatigue Performance of an Additively Manufactured Zr-Based Bulk Metallic Glass and the Effect of Post-Processing

Sohrabi

Nasab

Rouxel

et al. 2021

Metals

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“…In 2016, the first Zrbased BMG was fabricated via AM [85]. A lot of attention has been attracted to the production of Zr-based BMGs in the last five years [5,28,[32][33][34]36,40,41,[45][46][47]50,51,53,[55][56][57][58]60,61,63,66,67,[69][70][71][72]74,[77][78][79][80][81][82]85,86,[91][92][93][94][95][96][97][98][99][101][102][103][104][107]<...>…”

Section: Based On Zirconiummentioning

confidence: 99%

Additive Manufacturing of Bulk Metallic Glasses—Process, Challenges and Properties: A Review

Sohrabi

Jhabvala

Logé

2021

Metals

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Bulk Metallic Glasses (BMG) are metallic alloys that have the ability to solidify in an amorphous state. BMGs show enhanced properties, for instance, high hardness, strength, and excellent corrosion and wear resistance. BMGs produced by conventional methods are limited in size due to the high cooling rates required to avoid crystallization and the associated detrimental mechanical properties. Additive manufacturing (AM) techniques are a potential solution to this problem as the interaction between the heat source, e.g., laser, and the feedstock, e.g., powder, is short and confined to a small volume. However, producing amorphous parts with AM techniques with mechanical properties comparable to as-cast samples remains a challenge for most BMGs, and a complete understanding of the crystallization mechanisms is missing. This review paper tries to cover recent progress in this field and develop a thorough understanding of the correlation between different aspects of the topic. The following subjects are addressed: (i) AM techniques used for the fabrication of BMGs, (ii) particular BMGs used in AM, (iii) specific challenges in AM of BMGs such as the control of defects and crystallization, (iv) process optimization of mechanical properties, and (v) future trends.

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“…Rapid solidification promotes the formation of amorphous alloys, but the rapid cooling process will cause the stress in the alloy to increase greatly, leading to the formation of micro-cracks [136]. In the past years, many scholars all over the world took various measures to overcome the crack defect in the SLM of BMGs as heat treatment [94], optimizing scanning strategy [91,104], decreasing the heat input [103], changing the oxygen content [131], compositing the plastic materials into alloys [96], designing lattice structures [137], and so on. Pores The Archimedes drainage method is generally used to measure the density of 3D-printed samples, but the surface of the printed samples is generally rough, and this roughness will capture small bubbles, thereby reducing the overall density.…”

Section: Defects In Slmmentioning

confidence: 99%

“…In addition to reducing the roughness in the AM process, post-treatment steps, such as those involving the formation of a coating or oxide on the surface, are generally not required. At present, the research trend of amorphous alloy SLM manufacturing is that on the one hand, the development of new materials is in progress, and on the other hand, the research results of material forming in the early stage have promoted the continuous development of new structures, such as the honeycomb structure [137] and metal frame reinforced BMG composites [31]. The composite material greatly improves the specific strength, quasi-plasticity, and elastic elongation of the metallic glass SLM structure.…”

Section: Prospective and Challengementioning

confidence: 99%

Research progress on selective laser melting (SLM) of bulk metallic glasses (BMGs): a review

Zhang

Tan

Tian

et al. 2021

Int J Adv Manuf Technol

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Bulk metallic glasses (BMGs) are a subject of interest due to their superior specific properties such as low coefficient of friction, high strength, large ductility in bending, high elastic modulus, high microhardness, and high resistance to corrosion, oxidation, wear, and so on. However, BMGs are difficult to apply in industry due to their difficulty in manufacturing and secondary operation. In the past few decades, many efforts have been carried out to overcome the defects in the manufacturing of BMGs. It is difficult to fabricate complex structures with the whole amorphous alloy owing to the limit of crystallization and critical cooling rate. Additive manufacturing (AM), such as selective laser melting (SLM), can obtain relatively high cooling rates during the “layer-by-layer” process, which makes it possible to surpass the dimensional limitation of metallic glass. In the SLM process, the high-speed cooling of molten pool and the avoidance of secondary processing are very beneficial to the production and application of amorphous alloys. In this paper, based on the research of SLM additive manufacturing BMGs in recent years, the factors affecting crystallization and forming ability are discussed from many aspects according to different material systems. The status and challenges of SLM manufacturing BMGs including Fe-based, Zr-based, Al-based, and some composite-based BMGs will be presented. Mechanical properties and physicochemical properties were introduced. This review aims to introduce the latest developments in SLM additive manufacturing BMGs, especially on the development of process parameters, structure formation, simulation calculation, fracture mechanism, and crystallization behavior. With the traditional fabricating methods, BMGs were mainly used as a structure material. It will provide another alternative to use BMGs as a functional material by introducing SLM technology in amorphous preparation with complex geometry. This review summarizes the technical difficulty and application prospects of BMGs preparation by SLM and discusses the challenges and unresolved problems. This review identifies key issues that need to be addressed in this important field in the future. These problems are related to the application of BMGs as high-strength structural materials and new functional materials in the future.

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Mechanical Properties of Honeycomb Structured Zr-Based Bulk Metallic Glass Specimens Fabricated by Laser Powder Bed Fusion

Cited by 11 publications

References 24 publications

Fatigue Performance of an Additively Manufactured Zr-Based Bulk Metallic Glass and the Effect of Post-Processing

Fatigue Performance of an Additively Manufactured Zr-Based Bulk Metallic Glass and the Effect of Post-Processing

Additive Manufacturing of Bulk Metallic Glasses—Process, Challenges and Properties: A Review

Research progress on selective laser melting (SLM) of bulk metallic glasses (BMGs): a review

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