期刊
INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING
卷 194, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ijpvp.2021.104522
关键词
FeCrAl ODS alloys; Irradiation hardening; Nano-hardness; Micro-hardness; Nix-Gao model; Modified Nix-Gao model
资金
- National Key Research and Development Program of China [2017YFB0702202]
- National Natural Science Foundation of China [U1532262]
The study investigates the hardening process of two types of FeCrAl ODS alloys irradiated by high-energy heavy ions at about 0.8 dpa and 200 degrees C. Results show that the alloy with 0.8 wt% Hf addition exhibits better resistance to irradiation hardening compared to the alloy with 0.6 wt% Zr addition. A correlation between micro- and nanohardness data is established for the ODS alloys. Additionally, a modified Nix-Gao model is utilized to fit the nano-hardness data across the entire indentation depth range.
Hardening of two kinds of FeCrAl ODS alloys irradiated by high-energy heavy ions to about 0.8 dpa at nominal 200 degrees C is investigated. A damage layer of 24 mu m in thickness produced by the ion irradiation in the specimens makes possible both the micro- and the nano-hardness tests. Nix-Gao model is used to eliminate the indentation size effect (ISE) from the hardness data of the damage plateau so as to obtain the equivalent bulk hardness values. Results of the hardness tests show that the FeCrAl ODS alloy with 0.8 wt% Hf addition exhibits better resistance to irradiation hardening than that with 0.6 wt% Zr addition. A correlation between the micro- and the nanohardness data is established as HV0 = 74.5H(0) (HV0 in unit of kgf/mm(2), H-0 in unit of GPa) for the ODS alloys. A modified Nix-Gao model which includes a maximum allowable density of the geometrically necessary dislocation (GND) and a non-uniform distribution of GNDs can fit well the nano-hardness data in the entire indentation depth range, including the near surface region with a damage ramp.
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