摘要
采用电化学沉积法,在Cu基片上制备出了平均晶粒尺寸为3nm的纳米晶α-Mn。通过对其在不同温度下真空退火,得到具有不同平均晶粒尺寸的纳米晶α-Mn系列样品。同时分析了电沉积、热处理条件对结构的影响,研究了结构与力学性能的关系。结果表明,随晶粒尺寸的减小,纳米晶α-Mn的力学性能表现出正Hall-Petch关系和反Hall-Petch关系;当晶粒小于临界晶粒尺寸42nm时,正Hall-Petch关系转变为反Hall-Petch关系。
The nanocrystalline α-Mn samples with a mean grain size of 3 nm were prepared by electrodeposition. A series of nanocrystalline α-Mn samples with various grain sizes were obtained by annealing the nanocrystalline α-Mn samples in vacuum at different temperatures. Correlations between the structure and mechanical properties have been investigated. It is found that the nanocrystalline α-Mn samples exhibit different Hall-Petch relationships from conventional to negative with decreasing the grain size at the critical grain size of 42 nm.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2007年第5期937-940,共4页
Rare Metal Materials and Engineering
基金
教育部高等学校优秀青年教师教学科研奖励计划资助
