Thermo-mechanical response of Al 6061 with and without equal channel angular pressing (ECAP)

Compressive behavior and deformation kinetics of ultrafine grained aluminum processed by equal channel angular pressing

“…Moreover, an obvious increase of SRS with increasing temperature is observed for both UFG and CG Al under whatever quasi-static or dynamic loading condition. Similar phenomenon was observed by Khan et al [50] in UFG-Al6061 processed using ECAP method. It should be pointed out that as m is defined in logarithmic term, such an evolution of m can lead to an obvious strength jump upon strain rate change.…”

Variable strain rate sensitivity in an aluminum alloy: Response and constitutive modeling

“…The increase of temperature can reinforce the thermal activation and lower the short range thermal barriers to the movement of dislocation. The thermal softening effect has been observed in many polycrystalline materials (e.g., as seen in Khan et al (2007), Khan and Meredith (2010), and Sung et al (2010)). An appropriate constitutive model should have the capability to mathematically describe the mechanical responses of material when it is subject to loadings under different strain rates and temperatures.…”

“…structured aluminum alloys, manifest thermal dependent strain rate sensitivity (e.g. Khan and Meredith, 2010). This suggests that a temperature dependent strain rate term should be included in the constitutive equation.…”

A constitutive model for analyzing martensite formation in austenitic steels deforming at high strain rates

“…The range M r s to M d corresponding to the SIMT process covers the in service temperatures reached by metastable austen itic steels during their plastic deformation in many industrial applications. Hence, besides the thermal softening shown by metal alloys (Farrokh and Khan, 2009;Khan and Meredith, 2010;Brunig and Gerke, 2011), the analysis of temperature ef fects in the deformation of austenitic steels presents particular interest.…”