Effect of Vacancy Formation Energy and Microhardness on the Debye Temperatures of Some α-Phase Alloys

Purushotham Endla

doi:10.11648/j.ijhep.20180501.11

Abstract

Effect of vacancy formation energy and microhardness on the Debye temperature of some α-phase alloys have been carried out on α-phase (fcc phase) Cu1-x-Znx alloys. The Debye temperatures of α-phase Cu1-x-Znx alloys have been obtained from X- ray integrated intensities. The integrated intensities have been measured with a Philips 3020 powder diffractometer fitted with a proportional counter using filtered CuKα radiation at room temperature and have been corrected for thermal diffuse scattering. The Debye temperatures of these alloys have been estimated from the hardness and are compared with those obtained from specific heats, elastic constants and X-ray intensity measurements.

Highlights

An alloy is a combination of two or more elements that results in a substance possessing metallic properties
Plendl et al [5] have pointed out that the microhardness (H) of a solid is dimensionally reciprocal to the compressibility and for isostructural material ψ is proportional to H-1
The motivation for this study is to verify the empirical method developed by Abraham and Hsu [1] for the calculation of Debye temperature from microhardness

Summary

Introduction

An alloy is a combination of two or more elements that results in a substance possessing metallic properties. A substitutional solid solution is generally formed if the metallic elements are combined. If the solute atoms occupy positions between the lattice sites of the solvent, it is called an interstitial solid solution. The extent of formation of solid solutions depends on the difference in atomic diameters. The solubility may be limited if the solute and the solvent atoms have large differences in electro negativities. In addition to the three factors discussed above, the solubility in the formation of a solid solution tends to be favoured when the crystal structure of the two metals are of the same type. The chemical forces in a crystal resist the motion of dislocations as it involves the displacement of atoms. Debye Temperatures of Some α-Phase Alloys strength dependent parameters like lattice constant, the lattice energy and the elastic properties

Experimental

Debye Tempetature

Hardness

Results and Discussion

Conclusion