TY - JOUR
T1 - Microstructure and dynamic strain aging behavior in oxide dispersion strengthened 91Fe-8Ni-1Zr (at%) alloy
AU - Barton, Dallin J.
AU - Kale, Chaitanya
AU - Hornbuckle, B. Chad
AU - Darling, Kristopher A.
AU - Solanki, Kiran
AU - Thompson, Gregory B.
N1 - Funding Information:
The authors gratefully acknowledge ARO-W911NF-15-2-0050 for supporting this research. C. Kale and K.N. Solanki acknowledge the financial support for this work from the Army Research Laboratory award number W911NF-15-2-0038 . Appendix A
PY - 2018/5/16
Y1 - 2018/5/16
N2 - 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 800 °C and 1000 °C. The resulting microstructure was fine grain with a nano-dispersion of Zr-oxide within the matrix, which was spherical for the 800 °C. ECAE and plate-like (and volumetrically larger) for the 1000 °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 (10−3 s−1) and at high strain rate (103 s−1) at room temperature and 473 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.
AB - 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 800 °C and 1000 °C. The resulting microstructure was fine grain with a nano-dispersion of Zr-oxide within the matrix, which was spherical for the 800 °C. ECAE and plate-like (and volumetrically larger) for the 1000 °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 (10−3 s−1) and at high strain rate (103 s−1) at room temperature and 473 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.
KW - Atom probe tomography
KW - Dynamic strain aging
KW - High rate
KW - ODS steel
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U2 - 10.1016/j.msea.2018.04.016
DO - 10.1016/j.msea.2018.04.016
M3 - Article
AN - SCOPUS:85045703740
VL - 725
SP - 503
EP - 509
JO - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
JF - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
SN - 0921-5093
ER -