Aging Characteristics of Rapidly Solidified Al-20 wt% Zn Alloy

Abstract

Al-20 wt% Zn samples were obtained at room temperature by rapid cooling from the melt. The quenched samples were aged at different temperatures below and above the transformation temperature (503 K) for 2 h, then quenched to room temperature. Structure variations and changes in internal friction, thermal diffusivity, Young's modulus and resistivity were traced for these testing conditions. The different results were explained in terms of the thermally induced structures in the alloy.

Thermally induced variations in structural and mechanical properties of rapid solidified Tin-based alloys

“…The concentration of point defects expected to form after the rapid solidification process is very high [4]. In such technique, the cooling rate is reasonably uniform so that the microstructure shows less variability [15].…”

“…samples leading to the formation of fine microstructure [15], with small crystallite, 7.43 Å, and high strain 1146.6 (Table 1). Besides, Zn decreased the crystallite of Sn, 47.62-7.43 Å, for R-SnZn sample, Table 1, which can be attributed to the strong tendency of Zn atoms to segregate on deformed grain boundaries [17], and so retards softening due to its grain refining effect which improves the mechanical properties of SnZnCu alloy [18].…”

“…The dynamic resonance method described elsewhere [7] was applied for measuring internal friction (Q −1 ), thermal diffusivity (D th ) and the dynamic elastic modulus (Y). The measuring system 0921-5093/$ -see front matter © 2008 Elsevier B.V. All rights reserved.…”

Transformation characteristics of Al–Ag and Al–Ag–Ti alloys

“…Tensile tests were carried out at room temperature (R.T. = 300 K). The yield stress, σ y , considered as the stress corresponding to the first significant deviation from linearity in the starting part of the stress-strain curves or the macroscopic elastic limit [14], and the fracture stress, σ f , which is taken as the last maximum stress applied to the sample before fracture, were determined from the stress-strain curves (see Fig. 1).…”

Creep Characteristics of a New Pb-Free Soldering Sn-In Pewter

“…Extensive deformation under constant stresses and without the risk of fracture [2,3] has been observed in a wide variety of alloy systems. Some experimental changes in the mechanical properties of materials were observed while undergoing a phase transformation [4][5][6].…”