کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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5436210 | 1509547 | 2017 | 14 صفحه PDF | دانلود رایگان |
In this study, we probe the activation parameters and time-dependent plastic behavior of a nanocrystalline Palladium-Gold alloy by means of elevated temperature micropillar compression experiments. All tests were conducted on a stable, displacement-controlled in situ SEM indenter. A series of strain rate jump tests, where the strain rates were varied from 10â4 sâ1 up to 10â2 sâ1, allowed us to extract strain rate sensitivity and average activation volumes in the order of 8 b3. Repeated load relaxation tests yielded lower activation volumes in the range of 4 b3. From the variation of test temperatures up to 125 °C, we extracted an apparent activation energy of â¼0.77 eV. The possible deformation mechanisms at such extremely small crystallite sizes are discussed within the framework of pertinent literature.
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Journal: Acta Materialia - Volume 129, 1 May 2017, Pages 124-137