Search results

Sort By:

Limit search:

Damage Accumulation in Nuclear Ceramics

100%

Thomé L., Moll S., Jagielski J., Debelle A., Garrido F., Sattonnay G.

Acta Physica Polonica A

2011

vol. 120

issue 1

7-12

Ceramics are key engineering materials in many industrial domains. The evaluation of radiation damage in ceramics placed in a radiative environment is a challenging problem for electronic, space and nuclear industries. Ion beams delivered by various types of accelerators are very efficient tools to simulate the interactions involved during the slowing-down of energetic particles. This article presents a review of the radiation effects occurring in nuclear ceramics, with an emphasis on new results concerning the damage build-up. Ions with energies in the keV-GeV range are considered for this study in order to explore both regimes of nuclear collisions (at low energy) and electronic excitations (at high energy). The recovery, by electronic excitation, of the damage created by ballistic collisions (swift heavy ion beam induced epitaxial recrystallization process) is also reported.

Effect of Grain Size on Mechanical Properties of Irradiated Mono- and Polycrystalline MgAl_2O_4

68%

Jagielski J., Piatkowska A., Aubert P., Labdi S., Maciejak O., Romaniec M., Thomé L., Jozwik I., Debelle A., Wajler A., Boniecki M.

Acta Physica Polonica A

2011

vol. 120

issue 1

118-121

The influence of the size of crystalline regions on mechanical properties of irradiated oxides has been studied using a magnesium aluminate spinel MgAl_2O_4. The samples characterized by different dimensions of crystalline domains, varying from sintered ceramics with grains of few micrometers in size up to single crystals, were used in the experiments. The samples were irradiated at room temperature with 320 keV Ar^{2+} ions up to fluences reaching 5 × 10^{16} cm^{-2}. Nanomechanical properties (nanohardness and Young's modulus) were measured by using a nanoindentation technique and the resistance to crack formation by measurement of the total crack lengths made by the Vickers indenter. The results revealed several effects: correlation of nanohardness evolution with the level of accumulated damage, radiation-induced hardness increase in grain-boundary region and significant improvement of material resistance to crack formation. This last effect is especially surprising as the typical depth of cracks formed by Vickers indenter in unirradiated material exceeds several tens of micrometers, i.e. is more than hundred times larger than the thickness of the modified layer.

Refine search results

2 Acta Physica Polonica A

2 2011

2 Debelle A.

2 Jagielski J.

2 Thomé L.

1 Aubert P.

1 Boniecki M.

1 Garrido F.

1 Jozwik I.

1 Labdi S.

1 Maciejak O.

1 Moll S.

1 Piatkowska A.

1 Romaniec M.

1 Sattonnay G.

1 Wajler A.

Search results

Damage Accumulation in Nuclear Ceramics

Effect of Grain Size on Mechanical Properties of Irradiated Mono- and Polycrystalline MgAl_2O_4