Uniform evolution of nanoporosity on amorphous Ti-Cu alloys
Uniform evolution of nanoporosity on amorphous Ti-Cu alloys
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非晶 Ti-Cu 合金纳米孔隙的均匀演化
DOI：
10.1166/jnn.2014.9444
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
Yu Sugawara,Izumi Muto and Nobuyoshi Hara
中科院分区：
文献类型：
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作者：
Zhenhua Dan;Fengxiang Qin;Yu Sugawara,Izumi Muto and Nobuyoshi Hara
以非晶二元Ti100−x Cu x (x = 40、50和60 at%)合金为起始材料，在自由浸泡条件下在0.03和0.13 M HF溶液中脱合金，浸泡43.2 ks后获得孔径为71-220 nm、韧带尺寸为72-209 nm的均匀纳米多孔结构。由于无定形前驱体中不存在金属间化合物和晶界、化学成分偏析等缺陷，纳米孔隙度的演变更加均匀。孔径和韧带尺寸随着浸泡时间和处理溶液浓度的增加而增加。孔径随着脱合金次数呈指数增加，指数为0.41-0.79。纳米孔隙率的演变受到合金成分的影响，韧带的形成受到铜吸附原子的表面扩散控制，并且还受到Ti-Cu合金中贵金属铜含量的覆盖的影响。
Amorphous binary Ti100−x Cu x (x = 40, 50 and 60 at%) alloys, as the starting materials, were dealloyed in 0.03 and 0.13 M HF solutions under a free immersion condition, and a uniform nanoporous structure with a pore size of 71–220 nm and ligament size of 72–209 nm was obtained after immersion for 43.2 ks. The evolution of nanoporosity underwent more uniformly due to the absence of the intermetallics and defects such as grain boundary, segregation in the chemical composition in the amorphous precursors. The pore size and the ligament size increased with the immersion times and the concentration of the treatment solutions. The pore size increased with the dealloying times exponentially with an exponent of 0.41–0.79. The evolution of nanoporosity was influenced by the alloy compositions, and the formation of the ligaments was controlled by surface diffusion of the Cu adatoms, and also influenced by the coverage of noble Cu contents in Ti–Cu alloys.