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Published in:
01-12-2008 | Ultrafine-Grained Materials
Microstructural investigation of AA 2195 T81 chips formed during a metal-cutting process
Published in: Journal of Materials Science | Issue 23-24/2008
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Abstract
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.