Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7972380 | Materials Science and Engineering: A | 2018 | 22 Pages |
Abstract
Mechanically alloyed 91Fe-8Ni-1Zr (at%) powders were fabricated through high energy ball milling of elemental powder and subsequently consolidated via equal channel angular extrusion (ECAE) at 800â¯Â°C and 1000â¯Â°C. The resulting microstructure was fine grain with a nano-dispersion of Zr-oxide within the matrix, which was spherical for the 800â¯Â°C. ECAE and plate-like (and volumetrically larger) for the 1000â¯Â°C ECAE conditions. Atom probe tomography confirmed trace levels of C, N, and Cr impurities within the alloy making it similar to a low-carbon steel. By performing mechanical testing at a quasi-static strain rate (10â3 sâ1) and at high strain rate (103 sâ1) at room temperature and 473â¯K, a load drop was noted after yielding. In general, this load drop became more pronounced with increasing strain rate and temperature and has been shown to be a result of dynamic strain aging in the ODS alloy.
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Authors
Dallin J. Barton, Chaitanya Kale, B. Chad Hornbuckle, Kristopher A. Darling, Kiran N. Solanki, Gregory B. Thompson,