Mechanical response of mesoscopic aluminum rings under uniaxial compression

Zhang, Bin; Ahmed, Shahrior; Shao, Shuai; Meng, W. J.

doi:10.1557/mrc.2018.81

Cited by 6 publications

(1 citation statement)

References 29 publications

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“…Averaged r-e curves were fitted to a power-law form, r ¼ K(e À e o ) n , and extrapolated to higher strain values not reached experimentally. More details about processing of the compression r-e curves were discussed previously [8]. Macroscale flow stresses at e b values of 0.75 and 1.12 were plotted versus d À1/2 in Fig.…”

Section: Resultsmentioning

confidence: 99%

Scaling Anomaly in the Mechanical Response in Microscale Reverse Extrusion of Copper

Zhang

Meng

2020

Journal of Micro and Nano-Manufacturing

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The continuing trend of device miniaturization brings increasing demand for small metal parts and, consequently, significant interest in microscale metal forming technologies. In this work, the influence of grain size on mechanical response in microscale axisymmetric reverse extrusion of Cu 110 alloy was investigated in detail. A characteristic plastic strain associated with material deformation in the extrusion process was, for the first time to the best of our knowledge, defined, measured, and used to evaluate the material's bulk flow stress at this corresponding strain. This flow stress was then used to scale measured mechanical response in reverse extrusion and help identify deviations from scaling behavior expected in continuum plasticity. A scaling anomaly was indeed observed, indicating a dependence of mechanical response on both the initial grain size and the characteristic dimension of microforming operations. Detailed microstructural examination of grains in extruded Cu parts was conducted, and points to directions for future study to better understand mechanisms behind the observed scaling anomaly.

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Section: Resultsmentioning

confidence: 99%