Effect of Au additions on the structure and properties of (Fe_0.5Co_0.5)₇₁Nb₄Si₅B₂₀ bulk metallic glass

ABSTRACT

The effect of addition of gold (Au) on the structure and mechanical properties of (Fe_0.5Co_0.5)₇₁Nb₄Si₅B₂₀ BMG alloy was studied. Addition of Au formed crystals in the BMG alloy. Gradual increase in the amount of Au added to the BMG alloy resulted in an increase in the amount of crystallinity and hardness of the alloy. Hardness values in excess of 1100 H_V were found in all the alloys with a maximum value of 1245 H_V. The thermal transition temperatures were also found to increase with an increasing amount of Au. Corner cracks were produced in the alloy with 1.5 at.-% Au content showing a low indentation fracture toughness value of 2.98 MPa-m^0.5.

KEYWORDS:

• Bulk metallic glass
• amorphous alloys
• BMG composites
• fracture toughness
• partial crystallinity
• hardness

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

This work has been carried out through the funds provided by Ghulam Ishaq Khan Institute of Engineering Sciences and Technology, Pakistan for the promotion of research in the institute.