Atomic-level crystallization in selective laser melting fabricated Zr-based metallic glasses

Zhang, Yue; Liu, Haishun; Mo, Jinyong; Wang, Mingzi; Chen, Zhe; He, Yezeng; Yang, Weiming; Tang, Chunguang

doi:10.1039/c9cp02181g

Cited by 23 publications

(7 citation statements)

References 46 publications

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“…Figure a locates the critical cooling rate ( R c ) required to suppress the melt crystallization completely around 48 K min –1 , at which complete vitrification of the SmB phase is expected. This R c indicates that the investigated compound is an intermediate crystallizer, though a bit rapid compared to other selected materials, such as some nematic mesogens, , polymers, and pharmaceuticals, as well as metallic alloys , and water droplets …”

Section: Resultsmentioning

confidence: 88%

Interplay between Melt and Cold Crystallization in a Smectic Liquid Crystal, 4-Pentylphenyl 4-(trans-4-Pentylcyclohexyl)benzoate

Rozwadowski

Yamamura

Saito

2021

Crystal Growth & Design

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In this study, we apply differential scanning calorimetry (DSC) and polarizing microscopy (POM) to elucidate the interplay of crystallization mechanisms controlling the tendency for melt and cold crystallization from the partially ordered smectic B phase in 4-pentylphenyl 4-(trans-4-pentylcyclohexyl)benzoate (5CPB5) mesogen. For this purpose, we pay attention to the kinetics of nonisothermal crystallization revealed by several complementary approaches, including Ozawa, Mo, and the isoconversional method. Additionally, we adopt the Hoffman–Lauritzen theory for analyzing the temperature dependence of crystallization activation energy, allowing us to describe the multistep crystallization of the smectic B mesophase. Our investigation shows the possibility of designing the mechanism controlling the different crystallization paths. Moreover, we demonstrate the ability to switch the dimensionality of crystal growth by modifying the dominance of molecular mobility through the experimental rate.

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Section: Resultsmentioning

confidence: 88%

Interplay between Melt and Cold Crystallization in a Smectic Liquid Crystal, 4-Pentylphenyl 4-(trans-4-Pentylcyclohexyl)benzoate

Rozwadowski

Yamamura

Saito

2021

Crystal Growth & Design

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show abstract

“…In fact, this issue continues to be an area of primary concern, with numerous studies describing computational and analytical models that describe heat distributions, nucleation processes, and other relevant considerations. [ 170–181 ] The two parameters that predominantly control both temperature and cooling rate within a specified region of each layer are the laser output power and travel speed

E_{ℓ} = \frac{P}{v \cdot d}

where

E_{ℓ}

is the energy intensity of the laser beam, P is laser output power in Watts, v is the laser travel speed in mm s −1 , and d is the laser beam spot diameter in mm. This equation ignores a variety of complexities in the process, including gas flow during deposition; nonetheless, it is useful as a first approximation.…”

Section: Manufacturing Approachesmentioning

confidence: 99%

“…In fact, this issue continues to be an area of primary concern, with numerous studies describing computational and analytical models that describe heat distributions, nucleation processes, and other relevant considerations. [170][171][172][173][174][175][176][177][178][179][180][181] The two parameters that predominantly control both temperature and cooling rate within a specified region of each layer are the laser output power and travel speed…”

Section: Additive Manufacturingmentioning

confidence: 99%

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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“…Zhang simulated the SLM fabrication of Cu 50 Zr 50 [163], Cu 10 Zr 90 [164], and Fe 50 Ni 50 [165] BMGs by using MD simulations to clarify the atomic-level crystallization mechanism and the effect of laser processing on the crystallization. The result implied local ordering and the formation of amorphous structure can be found in the SLM parts.…”

Section: Crystallization Modeling Of Bmgs By Slmmentioning

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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Atomic-level crystallization in selective laser melting fabricated Zr-based metallic glasses

Abstract: Scan speed impacts greatly on average temperature variation rate and thus atomic-level changes in clusters and crystallization.

Cited by 23 publications

References 46 publications

Interplay between Melt and Cold Crystallization in a Smectic Liquid Crystal, 4-Pentylphenyl 4-(trans-4-Pentylcyclohexyl)benzoate

Interplay between Melt and Cold Crystallization in a Smectic Liquid Crystal, 4-Pentylphenyl 4-(trans-4-Pentylcyclohexyl)benzoate

Latest Advances in Manufacturing and Machine Learning of Bulk Metallic Glasses

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

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