Dislocation slip distance during compression of Al–Si–Cu–Mg alloy with additions of Ti–Zr–V

Abstract

The plastic deformation behaviour of the Al–Si–Cu–Mg alloy with micro-additions of Zr–V–Ti was measured in the temperature range of 298–673 K and the true stress–true strain compression curves were used to calculate the dislocation slip distance (DSD). A new constitutive equation for the temperature dependent DSD was developed, based on Mott's theory of strain hardening. The DSD predicted by the model was in good agreement not only with values achieved for the Al–Si–Cu–Mg alloy tested but also for other Al based and Pb–Sb alloys with deformation data available in the literature. A comparison of deformation and microstructure suggests that the grain refinement during hot compression deformation occurring due to continuous dynamic recrystallisation is responsible for a drastic growth of the DSD.

Effect of solidification rate and loading mode on deformation behavior of cast Al–Si–Cu–Mg alloy with additions of transition metals

“…The obtained strengthening coefficient K also decreased from 563 to 546 MPa for the SDAS values of 18 to 30 µm in the as cast state; while it increased from 584 to 594 MPa for the similar range of SDAS for the T6 heat treated condition. The n value of the T6 temper sample is in agreement with that reported in[32,33] for A356 T6 alloy where n≈0.17 was obtained. The strain hardening exponent was also reported to be strongly dependent on the aging temperature for the A356 T6 alloy with n values ranging from 0.08 to 0.17[21,34].Feltham and Meakin[35] modified Eq[3] by incorporating the uniform plastic deformation for better understanding of hardening behavior of the materials as follows,…”

Microstructure and mechanical properties of Al–Si cast alloy with additions of Zr–V–Ti

“…With increasing testing temperature, the movement of dislocations increases which improves their annihilation and reduces their accumulation/pileup at grain boundaries. As a result, the rate of work hardening reduces and thermal softening of materials enhances and that is the reason for the decrease of the n values over the increasing temperature [27,44]. The decreasing strain hardening rate with increasing temperature is due to particle cracking as the material is deformed.…”

“…Strain hardening, which affects the strength and ductility of materials, depends on the generation and annihilation of dislocations during deformation [27,42]. Hence, the hardening capacity is defined as the ability to create and store dislocations in the materials.…”

“…The role of transition metals in cast Al alloys has been a subject of many studies [6,[20][21][22][23][24][25][26][27][28]. It was reported that minor additions of Zr in aluminum alloys improve the tensile strength and wear resistance.…”

Fatigue Resistance of Self-hardening Aluminium Cast Alloy

“…Al-Zn-Si-Mg alloys) introduce an innovative class of light Al-alloys. The important benefit represents possibility to avoid the heat treatment, contributing the considerably reduce cost of some components and also the amount of energy [5][6][7][8][9].…”