Elevated temperature, micro-compression transient plasticity tests on nanocrystalline Palladium-Gold: Probing activation parameters at the lower limit of crystallinity
Elevated temperature, micro-compression transient plasticity tests on nanocrystalline Palladium-Gold: Probing activation parameters at the lower limit of crystallinity
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纳米晶钯金的高温、微压缩瞬态塑性测试:探测结晶度下限的活化参数
DOI:
10.1016/j.actamat.2017.02.045
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发表时间:
2017
期刊:
影响因子:
9.4
通讯作者:
J. Michler
中科院分区:
文献类型:
--
作者:
J. Wehrs;M. J. Deckarm;J. M. Wheeler;X. Maeder;R. Birringer;S. Mischler;J. Michler
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-controlledin situSEM indenter. A series of strain rate jump tests, where the strain rates were varied from 10−4s−1up to 10−2s−1, 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 ∼0.77 eV. The possible deformation mechanisms at such extremely small crystallite sizes are discussed within the framework of pertinent literature.
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