Effect of cold rolling on the pressure coefficient of glass transition temperature in bulk metallic glasses

Parijat P. Jana, Jürgen Eckert, Jayanta Das

Publikation: Beitrag in FachzeitschriftArtikelForschungBegutachtung


Vitreous alloys exhibit changes in the specific heat capacity (Δcp) as well as configuration at the characteristic
glass transition temperature (Tg). A wide variety of bulk metallic glasses (BMGs) such as, Zr47.5Cu47.5Al5,
Zr55Cu30Ni5Al10, Zr52.5Cu17.9Ni14.6Al10Ti5 and Zr41.2Ti13.8Cu12.5Ni10Be22.5 were rolled at room temperature, and
the variation of Tg, Δcp at Tg, configurational entropy (ΔSconf.), pressure coefficient of Tg (dTg/dP) and bending
strength were measured to understand the configurational change in BMGs upon cold rolling. The normalized
bending moment during yielding of a cold rolled Zr55Cu30Ni5Al10 has increased by 43.4% than the as-cast
specimen. The ΔSconf. of the Zr55Cu30Ni5Al10 plate increased upon rolling from 0.537±0.041 J/mol∙K for as-
cast to 0.654±0.032 J/mol∙K for 70% cold rolled sample. A relaxed glassy state with low Tg exhibits high
dTg/dP value and vice versa.
FachzeitschriftThermochimica Acta
Frühes Online-Datum2 Okt. 2021
PublikationsstatusVeröffentlicht - Dez. 2021

Bibliographische Notiz

Funding Information:
We thank S. Mudliyar, S. Mandal, S. Maity, and S. Bhattacharyya for technical assistance during experiments. J.D. acknowledges the financial support of SRIC IIT Kharagpur (SGIRG). P.P.J. was supported by the MHRD research scholarship, Government of India. J.E. gratefully acknowledges the support provided by the European Research Council under the Advanced Grant “INTELHYB – Next generation of complex metallic materials in intelligent hybrid structures” ( Grant ERC-2013-ADG-340025 ). The XRD, TEM and three point bend tests were performed at the Central Research Facility, IIT Kharagpur.

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© 2021

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