Influence of crystallinity on thermo-process ability and mechanical properties in a Au-based bulk metallic glass

Cardinal, S.; Pelletier, Jean; Eisenbart, Miriam; Klotz, Ulrich

doi:10.1016/j.msea.2016.02.078

Cited by 14 publications

(5 citation statements)

References 39 publications

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“…for instance, this structural parameter increases from 58 to 73 nm at the fourth crystallization stage in the G3 alloy as compared with the C2 alloy. also, the volume fraction of crystalline phases (V f ) is obtained by using the XRd patterns (based on the ratio of the integrated areas of the amorphous and the crystalline peaks [26][27][28]). in other words, it can be measured using the following equation and is listed in Table 2.…”

Section: Resultsmentioning

confidence: 99%

Archives of Metallurgy and Materials

Rezaei-Shahreza,

Redaei,

Moosavi

et al. 2021

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EffEct of cooling RatE on MEchanical PRoPERtiEs of nEw MulticoMPonEnt fe-BasEd aMoRPhous alloy duRing annEaling PRocEssfe-based bulk metallic glasses (BMGs) have been extensively investigated due to their ultrahigh strength and elastic moduli as well as desire magnetic properties. however, these BMGs have few applications in industrial productions because of their brittleness at room temperature. This study is focused on the effect of cooling rate on the mechanical properties (especially toughness) in the fe 41 Co 7 Cr 15 Mo 14 Y 2 C 15 B 6 BMG. for this aim, two samples with the mentioned composition were fabricated in a water-cooled copper mold with a diameter of 2 mm, and in a graphite mold with a diameter of 3 mm. The formation of crystalline phases of fe 23 (B, C) 6 , α-Fe and Mo 3 Co 3 C based on XRd patterns was observed after the partial crystallization process. To determine the toughness of the as-cast and annealed samples, the indentation technique was used. These results revealed that the maximum hardness and toughness were depicted in the sample casted in the water-cooled copper mold and annealed up to 928°C. The reason of it can be attributed to the formation of crystalline clusters in the amorphous matrix of the samples casted in the graphite mold, so that this decrease in the cooling rate causes to changing the chemical composition of the amorphous matrix.

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Section: Resultsmentioning

confidence: 99%

Archives of Metallurgy and Materials

Rezaei-Shahreza,

Redaei,

Moosavi

et al. 2021

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“…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%

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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“…Precious metals have numerous applications due to their metallic luster and superior mechanical characteristics like hardness and wear resistance, especially in commercial areas such as the watch and jewelry industry [72,73]. Usually, the mechanical performances of precious BMGs are higher than the performances of their crystalline alloy counterparts.…”

Section: Precious Bmgmentioning

confidence: 99%

Mechanical Properties of Bulk Metallic Glasses Additively Manufactured by Laser Powder Bed Fusion: A Review

Luo,

2023

Materials

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Bulk metallic glasses (BMGs) display excellent strength, high hardness, exceptional wear resistance and corrosion resistance owing to its amorphous structure. However, the manufacturing of large-sized and complex shaped BMG parts faces significant difficulties, which seriously hinders their applications. Laser powder bed fusion (LPBF) is a typical additive manufacturing (AM) technique with a cooling rate of up to 108 K/s, which not only allows for the formation of amorphous structures but also solves the forming problem of complex-shaped BMG parts. In recent years, a large amount of work has been carried out on the LPBF processing of BMGs. This review mainly summarizes the latest progress in the field of LPBF additively manufactured BMGs focusing on their mechanical properties. We first briefly review the BMG alloy systems that have been additively manufactured using LPBF, then the mechanical properties of LPBF-fabricated BMGs including the micro- and nano-hardness, micropillar compressive performance, and macro-compressive and tensile performance are clarified. Next, the relationship between the mechanical properties and microstructure of BMGs produced via LPBF are analyzed. Finally, the measures for improving the mechanical properties of LPBF-fabricated BMGs are discussed. This review can provide readers with an essential comprehension of the structural and mechanical properties of LPBF-manufactured BMGs.

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Influence of crystallinity on thermo-process ability and mechanical properties in a Au-based bulk metallic glass

Cited by 14 publications

References 39 publications

Archives of Metallurgy and Materials

Archives of Metallurgy and Materials

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

Mechanical Properties of Bulk Metallic Glasses Additively Manufactured by Laser Powder Bed Fusion: A Review

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