3D pore structure characterization and hardness in a powder bed fusion-processed fully amorphous Zr-based bulk metallic glass

Shi, Jianye; Ma, Songyun; Wei, Shuai; Best, James P.; Stolpe, Moritz; Beckmann, Agnes; Mostafavi, Shimaalsadat; Korte‐Kerzel, Sandra; Markert, Bernd

doi:10.1016/j.matchar.2020.110178

Cited by 29 publications

(17 citation statements)

References 59 publications

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“…The UTS decreases from ∼ 1200MPa to ∼ 900MPa for models with an average porosity of 0.5% to 5% while the Young's modulus, measured from the linear elastic part of the curves, decreases from ∼ 83GPa to ∼ 72GPa. Shear banding is reported as the main mechanism for the fracture of powder sintered materials and BMGs [2][3][4][5][6][7][8]. Fig.…”

Section: Resultsmentioning

confidence: 99%

Numerical study of shear bands formation in a 3D‐printed Zr‐based bulk metallic glass under uniaxial loading

Shi

Markert

2021

Proc Appl Math and Mech

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Processing metallic materials via selective laser melting (SLM) enables the production of bulk metallic glasses (BMGs) with large size and complex shape, which is difficult or even impossible to achieve using traditional manufacturing techniques. In this study, the initiation and propagation of shear bands as well as the tensile strength in a 3D-printed BMG with printing defects by means of inherent porosities are studied. A multi-slips system model based on Mohr-Coulomb theory is applied.

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Section: Resultsmentioning

confidence: 99%

Numerical study of shear bands formation in a 3D‐printed Zr‐based bulk metallic glass under uniaxial loading

Shi

Markert

2021

Proc Appl Math and Mech

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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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“…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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3D pore structure characterization and hardness in a powder bed fusion-processed fully amorphous Zr-based bulk metallic glass

Cited by 29 publications

References 59 publications

Numerical study of shear bands formation in a 3D‐printed Zr‐based bulk metallic glass under uniaxial loading

Numerical study of shear bands formation in a 3D‐printed Zr‐based bulk metallic glass under uniaxial loading

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

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