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., Aksöz S., Keşlioǧlu K., MARAŞLI N.

International Journal of Materials Research, cilt.107, sa.11, ss.1005-1015, 2016 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 107 Sayı: 11
  • Basım Tarihi: 2016
  • Doi Numarası: 10.3139/146.111424
  • Dergi Adı: International Journal of Materials Research
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.1005-1015
  • Anahtar Kelimeler: Metals, Crystal growth, Microstructure, Mechanical properties, Electrical properties
  • İstanbul Gelişim Üniversitesi Adresli: Hayır

Özet

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.