High Temperature Creep Behavior of Zn-1.0Cu-0.2Ti Alloy

Abstract

In the present work, Zn-1.0Cu-0.2Ti alloy was prepared by melt casting and extruding processes. High temperature creep property of the alloy was determined using electronic creep relaxation testing machine. Microstructures of the alloy before and after creep test were observed and its high temperature creep mechanism was discussed. The results show that the steady-state creep rate of the alloy increases with temperature and stress. The logarithm of steady-state creep rate (ln) shows a linearity relationship with the logarithm of the stress (lnσ) and reciprocal of temperature (1/T). The stress exponent and apparent activation energy for creep have been determined to be 5.10 and 83.7 kJ/mol, separately. The predominant mechanism is mainly self-diffusional creep. The second phases on the grain boundary can block the slip of grain boundary and dislocation motion which can improve creep resistance of the alloy.

Effect of Sn Addition on the Microstructure and Age-Hardening Response of a Zn-4Cu Alloy

“…Alloying is a popular technique to enhancing the mechanical characteristics of pure Zn. Various amounts of alloying elements were used to improve the mechanical properties of Zn alloys such as Mg [6], Fe [7], Ag [8], Ca [9], Mn [10], Cu [11], Ti [12], Li [13], and rare earth elements (REEs) [14]. Copper (Cu) is one of the essential trace elements for humans, with a normal level of 1.1-1.5 µg/mL found in blood serum, making it a superior alloying element [15].…”