DataVXACS Applied Nano MaterialsPaper
journal article·2021-08-27

Cryo-Casting for Controlled Decomposition of Cu–Zr–Al Bulk Metallic Glass into Nanomaterials: Implications for Design Optimization

Baran Sarac, Jeong Tae Kim, Yurii P. Ivanov, Viktor Soprunyuk, Sergey V. Ketov, Wilfried Schranz, Sung Hwan Hong, Ki Buem Kim, A. Lindsay Greer, Jürgen Eckert

ACS Applied Nano Materials· Volume 4· Issue 8
Publisher page
Source abstract

Abstract

Cryo-cooled copper-mold suction casting reveals an unexpected phase separation (PS) in Cu46Zr46Al8 bulk metallic glass (BMG) by controlled atomic diffusion. The decomposed alloy cryo-cast to 193 K exhibits a remarkably lower free volume than the alloy cast to room temperature manifested by dilatometry. An unusual endotherm after the onset of relaxation registered by differential scanning calorimetry and compositional homogenization occurring on long time scales upon post-heat treatment even above the glass-transition temperature confirm the stability of the decomposed state against crystallization. As revealed by scanning transmission electron microscopy and energy-dispersive X-ray analysis, single-stage PS (cryo-cast to 193 K) results in distinct and evenly dispersed nanoscale Cu- and Zr-rich regions, whereas two-stage PS (cast to 298 K) involves further decomposition of existing Cu- and Zr-rich regions on a finer scale. Notably, PS accounts for macroscopic compressive plasticity at no expense of fracture strength. This study opens opportunities for the design optimization of homogeneously dispersed amorphous nanostructures of controllable size and composition in BMGs by single- or multistage decomposition through mold temperature control.
Source: openalex_inverted_index · Quality: baseline

Research context

Metals & alloysCeramics & glassesNanomaterialsMaterials processing

OpenAlex topics: Metallic Glasses and Amorphous Alloys

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Erich Schmid Institute of Materials Science, Austrian Academy of Sciences, Jahnstraße 12, 8700 Leoben, Austria

Maritime Technology Research Institute, Agency for Defense Development, Jinhae, Changwon, Gyeongnam 51678, Republic of Korea

Department of Materials Science & Metallurgy, University of Cambridge, Cambridge CB3 0FS, U.K.

School of Natural Sciences, Far Eastern Federal University, 690950 Vladivostok, Russia

Faculty of Physics, Physics of Functional Materials, University of Vienna, Boltzmanngasse 5, A-1090 Wien, Austria

Department of Nanotechnology and Advanced Materials Engineering, Sejong University, 209, Neungdong-ro, Gwangjin-gu, Seoul 05006, Republic of Korea

Department of Materials Science, Chair of Materials Physics, Montanuniversität Leoben, Jahnstraße 12, 8700 Leoben, Austria

Adjunct with National University of Science and Technology (MISiS), Leninsky Prosp., 4, 119049 Moscow, Russia

Funding

Austrian Science Fund · Ministry of Science and Higher Education of the Russian Federation · FP7 Ideas: European Research Council · H2020 European Research Council

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