A systematic study is carried out in which bulk metallic glass matrix composites with different percentages of ZrC subjected to a laser source of constant size (spot size). The effect of laser power and scan speed are evaluated. Bulk metallic glass matrix composites are advocated to be material of future owing to their superior strength, hardness and elastic strain limit. However, they possess poor
toughness which makes them unusable in any structural engineering application. Inoculation has been used as effective mean to overcome this problem. Zr47.5Cu45.5Al5Co2 bulk metallic glass matrix composites (BMGMC) inoculated with ZrC have shown considerable refinement in microstructure owing to heterogeneous nucleation. Efforts have also been made to exploit modern laser-based metal additive manufacturing to fabricate BMGMC parts in one step. The study clearly shows sign of fusion at certain places and then recrystallisation while some areas specially elongated Al2Zr fcc phase are left as such. It appears that CuZr B2 phase is melted completely while Al2Zr fcc phase experience partial or incomplete melting. However, the effect of laser on inoculated material is unknown. It is observed that laser treatment not only refine the microstructure but result in change of size, morphology and dispersion of CuZr B2 phase in, heat affected zone and fusion zone in Zr47.5Cu45.5Al5Co2. A similar effect is observed for β-Zr and Zr2Cu in non-inoculated Zr65Cu15Al10Ni10. This effect is documented with back scatter electron imaging.
Author (s) Details
Muhammad Musaddique Ali Rafique
Eastern Engineering Solutions LLC, Detroit, MI, USA.
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