Authors
Norimasa Nishiyama, Takashi Taniguchi, Hiroaki Ohfuji, Kimiko Yoshida, Fumihiro Wakai, Byung-Nam Kim, Hidehiro Yoshida, Yuji Higo, Astrid Holzheid, Oliver Beermann, Tetsuo Irifune, Yoshio Sakka, Ken-ichi Funakoshi
Publication date
2013/9/1
Journal
Scripta Materialia
Volume
69
Issue
5
Pages
362-365
Publisher
Pergamon
Description
Transparent nanocrystalline bulk alumina was obtained at 7.7GPa and 800°C. The alumina has an average grain size of ∼150nm and an in-line transmission of 71% for a wavelength of 640nm and a thickness of 0.8mm. The values of microhardness and fracture toughness were found to be 25.5±0.3GPa and 2.9±0.3MPam1/2, respectively. The hardness value is consistent with the previously determined Hall–Petch relation and fracture toughness is independent of grain size.
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Scholar articles
N Nishiyama, T Taniguchi, H Ohfuji, K Yoshida… - Scripta Materialia, 2013