Dependence of microstructure, microhardness, tensile strength and electrical resistivity on growth rates for directionally solidified Zn-Al-Sb eutectic alloy


Bayram Ü. , Karamazi Y., ATA P., Aksoz S., Keslioglu K., MARAŞLI N.

International Journal of Materials Research, vol.107, no.11, pp.1005-1015, 2016 (Journal Indexed in SCI Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 107 Issue: 11
  • Publication Date: 2016
  • Doi Number: 10.3139/146.111424
  • Title of Journal : International Journal of Materials Research
  • Page Numbers: pp.1005-1015
  • Keywords: Metals, Crystal growth, Microstructure, Mechanical properties, Electrical properties, MICROINDENTATION HARDNESS, TEMPERATURE-GRADIENTS, MECHANICAL-PROPERTIES, RAPID SOLIDIFICATION, EQUIAXED TRANSITION, THERMAL PARAMETERS, LAMELLAR SPACINGS, SN-ZN, PB-CD, SELECTION

Abstract

© Carl Hanser Verlag GmbH & Co. KG.Zn-5.3 wt.% Al-0.8 wt.% Sb alloy was directionally solidified upward at a constant temperature gradient (G = 2.39 K mm-1) with a wide range of growth rates (V) (9.70-2 013.40 μm s-1) by using a Bridgman type directional solidification furnace. The average values of eutectic spacing (λ), microhardness (HVT), ultimate tensile strength (σUTS) and electrical resistivity (ρ) were measured from transverse sections of the directionally solidified samples. The dependency of λ, HVT, σUTS and ρ on V were experimentally obtained by using linear regression analysis for low, high and all growth rates. The bulk growth rates were also determined by using the measured values of λ and V for low, high and all growth rates. The results obtained in the present work were compared with the Jackson-Hunt eutectic theory and similar experimental results in the literature. Also, the specific heat difference (ΔCP) and enthalpy of fusion (ΔH) for the Zn-Al-Sb alloy were determined by means of differential scanning calorimetry.