A comparative study of mechanical properties in ion-irradiated a12o3 and mgonal2o3

K. Yasuda, C. Kinoshita, K. Izumi

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Abstract

We have investigated radiation hardening in alumina (A12O3), stoichiometric and nonstoichiomctric spinel (MgOnAl2O3: n= 1, 2.4) crystals at 300 K irradiated with 100 keV He+ ions by using a ultra-microhardness technique. AOj shows a remarkable radiation hardening (35% increase in hardness) at a flucnce of 5xl019 HeVm2 and saturates at 60 % of the maximum value at fluenccs higher than 8xl019 He+/m2. In spinel crystals, hardness increases monotonically with fluence, reaching to a saturation at a fluencc of lxl020He+/m2. Analyses of loaddisplacement curves indicate that both plastic and elastic hardening are responsible for the radiation hardening in AOj, and that plastic hardening is the main cause in MgOnAl2O3. Microstructure observations and lattice constant measurements showed that point defects are mainly responsible for the radiation hardening in both A12O3 and MgOnAl2O3. The difference in the radiation hardening response is discussed in terms of the difference in recombination rate of point defects among the MgO-Al2O3 system ceramics.

Original languageEnglish
Pages (from-to)317-322
Number of pages6
JournalMaterials Research Society Symposium - Proceedings
Volume540
Publication statusPublished - Dec 1 1999

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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