Microstructural investigation of AA 2195 T81 chips formed during a metal-cutting process
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In this study, the microstructure of AA 2195 T81 metal-cutting chips formed during a turning operation were characterized using microscopy and diffraction techniques. At a constant strain of 2, the resulting strain rate imposed on the metal was varied from 0.8 × 104 to 2.6 × 105 s−1. At strain rate of 0.8 × 104 s−1, the resulting microstructure contained regions of 100 nm ultrafine grains. At the highest strain rate of 2.6 × 105 s−1, 150–200 nm ultrafine grains were observed plus overaged precipitates. The grain size increment and appearance of overaged precipitates with the higher strain rate is conjectured to be a result of temperature increment and not of direct strain rate.
KeywordsHigh Strain Rate Metal Cutting Transmission Electron Microscopy Specimen Shear Band Spacing High Strain Rate Condition
The authors wish to thank Mr. Curtis Bahr at the NASA-MSFC for fabrication of the test specimens. The authors wish to acknowledge the funding provided by the 2007 NASA Summer Faculty Program #NNM05AA22A and the AFOSR Grant FA9550-07-1-0282.
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