Effect of grain size and indium addition on tensile characteristics of Al–1Si alloy

Abstract

The effect of grain size and indium addition on the workhardening characteristics of Al–1Si (wt-%) alloy has been investigated at room temperature (RT). The samples were preaged at different temperatures in the range 523–623 K. The yield stress, the fracture stress, the fracture time and the linear workhardening coefficient generally decreased with increasing temperature and/or grain size, while the fracture strain and dislocation slip distance increased. The yield and fracture stresses for different grain sizes at different temperatures were found to be linearly related to grain diameters. Indium addition caused general increase for all the measured strength parameters. As concluded from transmission electron microscope (TEM) investigations, In addition to Al–Si alloy may retard the coarsening of Si particles. The energies activating the operating fracture mechanisms were found to be 79·6±0·4 and 32·4±0·4 kJ mol−1 for alloys Al–1Si and Al–1Si–0·2In respectively. This suggests a value of 47·2 kJ mol−1 as a binding energy between Si and In atoms in Al matrix.

Influence of heat treatment on stress–strain behaviour and lattice parameters of Sn–In alloy

“…2b) with a strong negative correlation coefficient (20?99) and has the form The parabolic work hardening coefficient K5Ls 2 /Le is determined using the Mott's model. 12,13 The relation between s 2 and e, in the intermediate range of the stressstrain curve, is fitted by the least squares method. It is found that it satisfies straight line equations with strong positive correlation coefficients .0?99 for all the deformation temperatures (Fig.…”

“…5 a . The parabolic work hardening coefficient K = ∂ σ 2 /∂ ϵ is determined using the Mott's model 12,13. The relation between σ 2 and ϵ , in the intermediate range of the stress–strain curve, is fitted by the least squares method.…”

Effect of phase transformation and indium addition on workhardening characteristics of Al–Zn alloy

“…10 The effect of temperature and structure transformation on the tensile characteristics of Al-12?6Zn alloy was studied. 4,11 Previous investigation showed [12][13][14] that indium addition improved the mechanical properties of Al alloys. Because of the industrial important applications of Al-Zn alloy, the aim of the present work was to investigate the effect of phase transformation and indium addition on the workhardening characteristics of Al-10Zn alloy.…”