摘要
为促进各向同性热解石墨的精密/超精密加工技术的发展,采用压痕试验的方法研究了其在纳米/微米尺度上的尺寸效应。在确立压痕试验中使用载荷可行性域的基础上,对不同载荷作用条件下存在的尺寸效应进行了研究。结果表明,为提高尺寸效应分析的准确性,本试验条件下所施加的载荷应大于450μN,且各向同性热解石墨压痕试验中硬度及弹性模量均存在一定的尺寸效应。同时,尺寸效应主要是由各向同性热解石墨表面附近球形单元内部的位错运动引起的。位错滑移阻碍较小时产生的尺寸效应较明显,位错滑移阻碍较大时产生的尺寸效应并不显著。
In order to develop the technology of precision /ultra-precision machining of isotropic pyrolytic graphite,the micro /nano-scale indentation size effect of the material was studied via indentation experiment. Based on the establishing of load range in indentation experiment,the indentation size effect was investigated under different loads. The results show that,in order to improve the confidence of indentation size effect,the load in the experiment should be larger than 450 μN. Besides,both hardness and elasticity modulus of isotropic pyrolytic graphite perform a certain extent of size effect. Furthermore,the indentation size effect is mainly depended on the movement of dislocation in the spherical unit of surface. When the resistance is small,the indentation size effect is obvious; when the resistance is large,the indentation size effect is non-obvious.
出处
《人工晶体学报》
EI
CAS
CSCD
北大核心
2015年第1期127-132,共6页
Journal of Synthetic Crystals
基金
国防基础预研基金
关键词
各向同性热解石墨
压痕
尺寸效应
载荷
isotropic pyrolytic graphite
indentation
size effect
load
