Structural investigations of Fe-Zr-Si-Cu metallic glass with low glass-forming ability produced in laser powder bed fusion technology

Szczepański, Łukasz; Bambach, Markus; Jensch, Felix; Ambroziak, Andrzej; Kurzynowski, Tomasz

doi:10.1016/j.matdes.2021.110112

Cited by 7 publications

(1 citation statement)

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“…Many investigations have focused on optimizing the process parameters to attain a fully amorphous product and avoid crystallized regions in the heat-affected zone, which is more susceptible to crystallization due to the thermal history of previous layers. [36][37][38] In spite of the fact that AM is a novel method for fabricating BMGs, supplying optimized compositions in the form of appropriate powder remains difficult. To solve this problem, in situ alloying upon selective laser processing could be a valuable procedure as it provides the opportunity to develop advanced multicomponent alloys.…”

Section: Introductionmentioning

confidence: 99%

High‐Entropy Alloy‐Induced Metallic Glass Transformation: Challenges Posed by in situ Alloying via Additive Manufacturing

et al. 2022

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In situ alloying and fabricating glassy structures through a layer‐by‐layer fashion approach are challenging but have high potential to develop novel‐graded materials. For the first time, this cost‐effective approach is applied to additive manufacturing (AM) of a Zr‐based bulk metallic glass (BMG) from high‐entropy alloys (HEAs). A newly developed composition of Zr40Al20Cu20Ti20 is fabricated through laser powder bed fusion (LPBF). Process parameters are optimized within a wide range of laser power (50–200 W) as well as scanning speed (50–800 mm s−1). In all printed samples, microscopic and compositional examinations reveal no glass formation, but very fine grains and CuTi and AlTi nanocrystals. Some glassy transitions at the interfaces may be encouraged to occur with proper melting and mixing. However, the main reason for not obtaining a glassy matrix is the substantial proportion of unmelted Zr raw powder throughout the structure as spherical particles. Consequently, glass formation can be hindered by a considerable amount of compositional deviation. During LPBF, in situ alloying poses significant challenges to developing BMGs. Hence, the various stages of the process, including raw material specifications, laser settings, and process parameters, should be investigated further.

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Section: Introductionmentioning

confidence: 99%