Abstract
Sn-36Bi-22Cu (wt.%) ternary eutectic alloy was prepared using vacuum melting furnace and casting furnace. The samples were directionally solidified upwards solidification rate varying from 8.3 to 166 µm/s and at a constant temperature gradient (4.2 K/mm) in a Bridgman-type directional solidification furnace. The composition analysis of the phases and the intermetallics (Cu3Sn and Cu6Sn5) were determined from EDX and XRD analysis respectively. The variation of the lamellar spacing (Bi-rich phase) and the Cu3Sn phase spacing with the solidification rate were investigated. The dependence of microhardness, ultimate compressive strength and compressive yield strength on solidification rate were determined. The spacing and microhardness were measured from both longitudinal and transverse sections of the samples. The dependence of microhardness on the lamellar spacing and the Cu3Sn phase spacing were also determined. The relationships between phase spacings, solidification rate and mechanical properties were determined from linear regression analysis.
Highlights
Solidification plays a vital role since it forms the basis for influencing the microstructure and improving the quality of cast products
The aim of the present work is to investigate the effect of solidification rate (V) on microstructure (λ), microhardness (HV) and compressive strength (σ) of the directionally solidified Sn-36Bi-22Cu ternary eutectic alloy
Energy dispersive X-ray (EDX) analysis was performed to determine the composition of phases in the Sn-Bi-Cu eutectic alloy
Summary
Solidification plays a vital role since it forms the basis for influencing the microstructure and improving the quality of cast products. For this improving the casting production and solidification methods have a significant effect on the mechanical properties of the materials and enhancing the quality of cast metals[1,2,3,4]. The mechanical properties of the alloys can be improved by obtaining finer microstructure result from higher solidification rates and higher cooling rates under several directional solidification conditions[6,7,8,9,10,11,12,13]. Liu et al.[16] reported that the tensile strength of the in situ composite from the directionally solidified alloy is significantly higher than that from the as-cast alloy
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