Effect of Copper and Zirconium Addition on Properties of Fe-Co-Si-B-Nb Bulk Metallic Glasses
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JMEPEG DOI: 10.1007/s11665-017-2753-0
Effect of Copper and Zirconium Addition on Properties of Fe-Co-Si-B-Nb Bulk Metallic Glasses Haris Ikram, Fazal Ahmad Khalid, Muhammad Akmal, and Zameer Abbas (Submitted January 11, 2017; in revised form March 22, 2017) In this research work, iron-based bulk metallic glasses (BMGs) have been fabricated, characterized and compared with Fe-Si alloy. BMG alloys of composition ((Fe0.6Co0.4)0.75B0.20Si0.05)96Nb4) were synthesized by suction casting technique using chilled copper die. Effect of copper and zirconium addition on magnetic, mechanical, thermal and electrochemical behavior of ((Fe0.6Co0.4)0.75B0.20Si0.05)96Nb4 BMGs was investigated. Furthermore, effect of annealing on nano-crystallization and subsequently on magnetic and mechanical behavior was also analyzed. Amorphousness of structure was evidenced by XRD analysis and microscopic visualization, whereas nano-crystallization behavior was identified by peak broadening of XRD patterns. Magnetic properties, measured by vibrating sample magnetometer, were found to be improved for as-cast BMG alloys by copper addition and further enhanced by nano-crystallization after annealing. Mechanical properties were observed to be increased by zirconium addition while slightly declined by copper addition. Potentiodynamic polarization analysis manifested the positive role of zirconium in enhancing corrosion resistance of BMGs in acidic, basic and brine mediums. Moreover, mechanical properties and corrosion analysis results affirmed the superiority of BMG alloys over Fe-Si alloy. Keywords
bulk metallic glasses, copper addition, Fe-Si alloy, magnetic properties, zirconium addition
1. Introduction Evolution of metallic glasses opens up a new era of advanced engineering materials which possess unprecedented mechanical properties, chemical stability and soft magnetic behavior due to which they are prevailing over conventional materials for magnetic and structural applications (Ref 1-4). Amorphous materials have absence of long range order and lack of crystallinity. Glassy or amorphous alloys are supercooled liquids formed by evading the crystallization process during solidification. Due to randomness of structure, they have non-anisotropic behavior in their properties. The exceptional properties of BMG alloys are attributed to low anisotropy, absence of crystalline defects, no microstructure inhomogeneity/second phase and absence of grain boundaries (Ref 5). Advent of metallic glasses was started over 40 years ago when first metallic glass in Au-Si system was developed (Ref 6, 7). Research on Fe-based BMG was started when Inoue and co-
Haris Ikram, Faculty of Materials and Chemical Engineering, GIK Institute of Engineering Sciences and Technology, Topi 23640, Pakistan; and School of Chemical and Materials Engineering, National University of Sciences and Technology, Islamabad 44000, Pakistan; Fazal Ahmad Khalid, Faculty of Materials and Chemical Engineering, GIK Institute of Engineering Sciences and Technology, Topi 23640, Pakistan; and Universi
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