The dependence of the strain path on the microstructure, texture and mechanical properties of cryogenic rolled Al-Cu alloy

Abstract

An investigation was conducted on Al-4%Cu alloy sheets to study the role of deformation path on the strength properties, evolution of microstructure and crystallographic texture during cryogenic rolling. Samples were rolled to two distinct thickness strains (50% and 75%) by unidirectional and cross rolling (bidirectional) routes. The strength and hardness properties were found to be more efficient in the cross rolled samples at 50% reduction than their counterparts rolled unidirectionally. Dynamic recovery was observed at higher rolling reductions on cross rolling. Microscopic features observed by EBSD revealed the occurrence of significant grain refinement on the samples rolled with a change of strain path. Also, the alteration of the rolling route resulted in distinct deformation textures and microstructures. TEM studies pointed out the scattered diffusion of the disintegrated dislocation cores and the redistribution of the second phase particles on higher rolling reductions with the change of strain path. Furthermore, the texture results showed a threefold increase on the Goss/Brass ratio which indicated the good fracture toughness behaviour of the cross rolled samples at lower reductions.

Repetitive corrugation and straightening effect on the microstructure, crystallographic texture and electrochemical behavior for the Al-7075 alloy

“…This observation could be related to the following two factors: i) the rotation applied for each RCS pass and ii) the formation of nano-metric grains. The first factor promotes a change in the slip system (Huang et al, 2001), which plays an important role in the resulting texture (Gurao et al, 2011;Selvan et al, 2020;Souza & Monlevade, 2021), whilst the second factor increases the number of grain boundaries, becoming relevant for the grain boundary deformation mechanisms (Gu et al, 2014). These two factors resulted in a continuous disruption of subgrain structures between the deformation passes, as previously observed in Fig.…”

Progress in the Optimization of Compositional Design and Thermomechanical Processing of Metastable β Ti Alloys for Biomedical Applications

“…The temperature at which cryogenic treatment is carried out plays a pivotal role in determining various alloy properties, including toughness, tensile strength, abrasion resistance, and impact resistance . Studies delving into the impact of cryogenic treatment temperature on mechanical properties have revealed some intriguing findings, particularly in relation to abrasion resistance, which tends to improve as the cryogenic treatment temperature decreases. , …”

“…147 Studies delving into the impact of cryogenic treatment temperature on mechanical properties have revealed some intriguing findings, particularly in relation to abrasion resistance, which tends to improve as the cryogenic treatment temperature decreases. 148,149 Gu et al 150 conducted an investigation into the effects of cryogenic temperature treatment on Ti6Al4 V alloy material at room temperature. In their experiments, one group of specimens was subjected to soaking at −196 °C for 12 h, followed by cryotreatment and tempering at 180 °C for 3 h. Their findings indicated a transformation of the metastable β phase into both α and stable β phases due to cryogenic treatment.…”