Enhancement of room-temperature plasticity in a bulk metallic glass by finely dispersed porosity
作者:Takeshi Wada、Akihisa Inoue、Alan Lindsay Greer
DOI:10.1063/1.1953884
日期:2005.6.20
Melts of Pd42.5Cu30Ni7.5P20 (at. %) held under pressurized hydrogen are cast into bulkmetallicglass (BMG) rods with fine (20–30μm diameter) pores uniformly dispersed. The low overall porosities (<4%) lead to only small reductions in Young modulus and yield strength, but to dramatically enhancedplasticity in compression: Rupture energy as high as 295MJm−3, compared to 16MJm−3 for the pore-free BMG
Novel organic compounds comprising a bicarbazole core are provided. In particular, the compound has a 3;3′-bicarbazole core substituted at the 9
th
position with at least one of dibenzofuran, dibenzothiophene, dibenzoselenophene, azadibenzofuran, azadibenzothiophene and azadibenzoselenophene. The compounds may be used in organic light emitting devices to provide devices having improved efficiency and improved lifetime.