Direct measurements of irradiation-induced creep in micropillars of amorphous Cu56Ti38Ag6, Zr52Ni48, Si, and SiO2

2015-01-14
Özerinç, Sezer
KİM, Hoe Joon
Averback, Robert S.
King, William P.
We report in situ measurements of irradiation-induced creep on amorphous (a-) Cu56Ti38Ag6, Zr52Ni48, Si, and SiO2. Micropillars 1 mu m in diameter and 2 mu m in height were irradiated with similar to 2MeV heavy ions during uniaxial compression at room temperature. The creep measurements were performed using a custom mechanical testing apparatus utilizing a nanopositioner, a silicon beam transducer, and an interferometric laser displacement sensor. We observed Newtonian flow in all tested materials. For a-Cu56Ti38Ag6, a-Zr52Ni48, a-Si, and Kr+ irradiated a-SiO2 irradiation-induced fluidities were found to be nearly the same, approximate to 3 GPa(-1) dpa(-1), whereas for Ne+ irradiated a-SiO2 the fluidity was much higher, 83 GPa(-1) dpa(-1). A fluidity of 3 GPa(-1) dpa(-1) can be explained by point-defect mediated plastic flow induced by nuclear collisions. The fluidity of a-SiO2 can also be explained by this model when nuclear stopping dominates the energy loss, but when the electronic stopping exceeds 1 keV/nm, stress relaxation in thermal spikes also contributes to the fluidity. (C) 2015 AIP Publishing LLC.

Citation Formats
S. Özerinç, H. J. KİM, R. S. Averback, and W. P. King, “Direct measurements of irradiation-induced creep in micropillars of amorphous Cu56Ti38Ag6, Zr52Ni48, Si, and SiO2,” JOURNAL OF APPLIED PHYSICS, vol. 117, no. 2, pp. 0–0, 2015, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/38595.