Melts of Pd42.5Cu30Ni7.5P20 (at. %) held under pressurized hydrogen are cast into bulk metallic glass (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 enhanced plasticity in compression: Rupture energy as high as 295MJm−3, compared to 16MJm−3 for the pore-free BMG
在加压
氢气下保持的 Pd42.5Cu30Ni7.5P20 (at. %) 熔体被浇铸成块状
金属
玻璃 (BMG) 棒,其细孔(直径为 20-30 微米)均匀分散。低总体孔隙率 (<4%) 仅导致杨氏模量和屈服强度的小幅下降,但显着增强了压缩塑性:与无孔 BMG 的 16MJm-3 相比,断裂能高达 295MJm-3。孔隙迫使剪切带在整体破坏应力以下扩散,这是增韧 BMG 的一个有趣过程,BMG 材料在变形中的剪切局部化限制了结构应用。