کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1584928 | 1514910 | 2006 | 9 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Flow processes at low temperatures in ultrafine-grained aluminum Flow processes at low temperatures in ultrafine-grained aluminum](/preview/png/1584928.png)
Experiments were conducted to evaluate the flow behavior of pure aluminum at low temperatures. Samples were processed by equal-channel angular pressing (ECAP) to give a grain size of ∼1.2 μm and compression samples were cut from the as-pressed billets and tested over a range of strain rates at temperatures up to 473 K. The results show the occurrence of steady-state flow in these highly deformed samples and a detailed analysis gives a low strain rate sensitivity and an activation energy similar to the value for grain boundary diffusion. By using depth-sensing indentation testing and atomic force microscopy, it is shown that grain boundary sliding occurs in this material at low temperatures. This result is attributed to the presence of high-energy non-equilibrium boundaries in the severely deformed samples.
Journal: Materials Science and Engineering: A - Volume 434, Issues 1–2, 25 October 2006, Pages 326–334