Laser coating of a Zr-based metallic glass on an aluminum substrate

Sohrabi, Navid; Panikar, Ramanandan Santhanu; Jhabvala, Jamasp; Buch, Alejandro Roda; Mischler, S.; Logé, Roland E.

doi:10.1016/j.surfcoat.2020.126223

Cited by 25 publications

(16 citation statements)

References 32 publications

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“…We recently studied crystallization of AMZ4 [67] and showed that the time to crystallization is in the order of 3 ms in the 750-800 • C temperature range, which effectively prevents the fabrication of fully amorphous AM parts. Bordeenithikasem et al [9] showed that crystallization of AMZ4 results in an increase of hardness and brittleness, making the material prone to cracking, which is consistent with the results of reference [60].…”

Section: Discussionsupporting

confidence: 81%

“…However, back-scattered electron (BSE) images of the X-Z cross-section (Figure 3b,c) show the presence of tiny crystals in the HAZ. Crystal sizes were in the sub-micron range, which is similar to those reported in our previous studies [8,40,60]. The average value of hardness (HV1) from ten measurements was 451 ± 6.…”

Section: Structure and Fatigue Behavior Of As-built Alloysupporting

confidence: 89%

“…Although the XRD pattern of the AB sample (see Figure 3) indicates an amorphous structure, nanocrystals were formed in HAZs due to the local thermal cycles induced in these regions by the overlapping and adjacent track deposition. The conventional XRD method is not sensitive enough to detect low volume fractions of crystallization, as already noticed in references [8,12,40,60].…”

Section: Discussionmentioning

confidence: 98%

“…The presence of unwanted nanocrystals in the fabricated parts deteriorates the toughness of BMGs [70,71] by introducing brittle phase/s and/or intermetallics, which can act as stress risers and result in premature failure [60]. It has also been reported that crystallization drastically reduces the fatigue limit [18,72].…”

Section: Discussionmentioning

confidence: 99%

“…One of the main challenges in AM of BMGs is unwanted crystallization in the heataffected zones (HAZs) due to cyclic heating and cooling [8,60]. Unwanted crystallization causes brittleness, with cracking typically associated with the combination of intermetallics and TRS [60]. Wang et al [18] studied the effect of partial crystallization of three as-cast Zrbased BMGs on fatigue properties.…”

Section: Introductionmentioning

confidence: 99%

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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: Discussionsupporting

confidence: 81%

Section: Structure and Fatigue Behavior Of As-built Alloysupporting

confidence: 89%

Section: Discussionmentioning

confidence: 98%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

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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Latest Advances in Manufacturing and Machine Learning of Bulk Metallic Glasses

et al. 2023

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In this review, two interrelated areas are focused on for the development of novel amorphous metallic alloys, namely, materials processing and machine learning techniques for the design of new alloy compositions. Findings, barriers, and opportunities are described, targeting powder production and sintering, additive manufacturing, and postprocessing techniques, followed by the latest developments in artificial intelligence algorithms for both the design of new alloys and for alloy classification tasks.

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