Indentation size effect and the plastic compressibility of glass
Indentation size effect and the plastic compressibility of glass
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DOI：
10.1063/1.4885337
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发表时间：
2014-06
影响因子：
4
通讯作者：
Morten M. Smedskjær
中科院分区：
文献类型：
--
作者：
Morten M. Smedskjær
氧化物玻璃在玻璃化转变温度下在施加的等静压下表现出显著的致密化。玻璃的可压缩性与化学组成和原子堆积密度相关，例如，具有平面三角形BO 3单元的硼酸盐玻璃比具有四面体单元的硅酸盐玻璃更适于致密化。我们在这里表明，热等静压压缩后的塑性压缩性和压痕尺寸效应（伊势）的程度之间有直接的关系，这是硬度与压痕载荷的减少所表现出的大多数材料。这可能表明伊势与压痕诱导的剪切带相关，当玻璃网络在施加的压力下通过结构和拓扑重排更适应体积变化时，剪切带应以更大的密度形成。
Oxide glasses exhibit significant densification under an applied isostatic pressure at the glass transition temperature. The glass compressibility is correlated with the chemical composition and atomic packing density, e.g., borate glasses with planar triangular BO3 units are more disposed for densification than silicate glasses with tetrahedral units. We here show that there is a direct relation between the plastic compressibility following hot isostatic compression and the extent of the indentation size effect (ISE), which is the decrease of hardness with indentation load exhibited by most materials. This could suggest that the ISE is correlated with indentation-induced shear bands, which should form in greater density when the glass network is more adaptable to volume changes through structural and topological rearrangements under an applied pressure.