TY - JOUR

T1 - Effect of cold rolling on the pressure coefficient of glass transition temperature in bulk metallic glasses

AU - Jana, Parijat P.

AU - Eckert, Jürgen

AU - Das, Jayanta

N1 - Publisher Copyright: © 2021

PY - 2021/12

Y1 - 2021/12

N2 - Vitreous alloys exhibit changes in the specific heat capacity (Δcp) as well as configuration at the characteristicglass 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, andthe variation of Tg, Δcp at Tg, configurational entropy (ΔSconf.), pressure coefficient of Tg (dTg/dP) and bendingstrength were measured to understand the configurational change in BMGs upon cold rolling. The normalizedbending moment during yielding of a cold rolled Zr55Cu30Ni5Al10 has increased by 43.4% than the as-castspecimen. 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 highdTg/dP value and vice versa.

AB - Vitreous alloys exhibit changes in the specific heat capacity (Δcp) as well as configuration at the characteristicglass 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, andthe variation of Tg, Δcp at Tg, configurational entropy (ΔSconf.), pressure coefficient of Tg (dTg/dP) and bendingstrength were measured to understand the configurational change in BMGs upon cold rolling. The normalizedbending moment during yielding of a cold rolled Zr55Cu30Ni5Al10 has increased by 43.4% than the as-castspecimen. 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 highdTg/dP value and vice versa.

KW - Bending test

KW - Bulk metallic glass

KW - Differential scanning calorimetry

KW - Rolling

KW - Specific heat

KW - Thermal stability

UR - http://www.scopus.com/inward/record.url?scp=85116537604&partnerID=8YFLogxK

U2 - 10.1016/j.tca.2021.179071

DO - 10.1016/j.tca.2021.179071

M3 - Article

AN - SCOPUS:85116537604

VL - 706.2021

JO - Thermochimica Acta

JF - Thermochimica Acta

SN - 0040-6031

IS - December

M1 - 179071

ER -