Effect of Heat Treatment on the Properties of (Fe0.6Co0.4)71Si5Nb4B20 Bulk Metallic Glass

Syed Zameer Abbas; Rashid Ali; Syed Muttahir Shah; Owais Jan; Munim Awan

doi:10.4028/www.scientific.net/KEM.875.70

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HomeKey Engineering MaterialsKey Engineering Materials Vol. 875Effect of Heat Treatment on the Properties of...

Effect of Heat Treatment on the Properties of (Fe_0.6Co_0.4)₇₁Si₅Nb₄B₂₀ Bulk Metallic Glass

Abstract:

Bulk metallic glasses (BMGs) are an important class of materials with unique set of properties. A bulk metallic glass with composition of (Fe_0.6Co_0.4)₇₁Nb₄Si₅B₂₀ was cast in the form of a 1 mm thick strip in a water cooled copper mold. The BMG produced was characterized for structure, thermal and mechanical properties. The X-ray diffraction performed on the as cast alloy has shown completely amorphous structure. The glass transition and crystallization peak temperatures obtained through differential scanning calorimetry scan were 542 °C and 588.4 °C, respectively. Some cast amorphous alloy sample was annealed below glass transition (450 °C for 30 mi93nutes) and others above glass transition (580 °C for 5 minutes) temperatures. Nano- indentation hardness of 13.3 GPa was obtained for as cast alloy while a hardness values of 12.8 and 15.84 GPa were measured for heat treated alloys at temperature of 450 °C and 580 °C, respectively. Increase in hardness was attributed to formation of crystals in an amorphous matrix whereas decrease in hardness was due to relaxation of quenching residual stresses. The maximum value of elastic modulus obtained through indentation was 255 GPa for 580 °C heat treated sample.

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Periodical:

Key Engineering Materials (Volume 875)

Pages:

70-75

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.875.70

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Online since:

February 2021

Authors:

Syed Zameer Abbas*, Rashid Ali, Syed Muttahir Shah, Owais Jan, Munim Awan

Keywords:

Amorphous Alloys, Bulk Metallic Glass, Elastic Modulus, Heat Treatment, Nanoindentation

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