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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Study of the interaction between the indentation size effect and Hall-Petch effect with spherical indenters on annealed polycrystalline copper
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Study of the interaction between the indentation size effect and Hall-Petch effect with spherical indenters on annealed polycrystalline copper

机译：球形多头压痕对退火多晶铜的压痕尺寸效应与霍尔-Petch效应之间相互作用的研究

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摘要

Methods to obtain tensile stress-strain properties of materials from a practically non-destructive indentation test are of great industrial interest. Nanoindentation is a good candidate. However, to do this successfully, indentation size effects must be accounted for. An indentation size effect with spherical indenters has been shown for a range of fcc metals with relatively large grain size ( Spary et al 2006 Phil. Mag. 86 5581-93); the increase in yield stress being proportional to the inverse cube root of indenter radius. Here, we investigate these differences further and present results for the indentation size effect with spherical indenters on Cu samples with a range of different grain sizes from 1 mu m to single crystal. The important experimental control parameter, of the relative size of the indentation compared with the grain size, is also explored by using indenters of different radii on the different grain sized samples. When the grain size, d, is less than 6 times the radius of the projected contact area, a, a Hall-Petch-like behaviour is observed superimposed on the indentation size effect. For d > 6a the indentation size effect dominates. The two effects may be combined by addition in quadrature. This new parametric function is able to predict the indentation pressure in annealed copper given input values of indenter radius and grain size.
机译：从实用的无损压痕试验获得材料的拉伸应力-应变性能的方法具有很大的工业价值。纳米压痕是一个很好的选择。但是，要成功完成此操作，必须考虑压痕尺寸的影响。对于具有相对大的晶粒尺寸的一系列fcc金属，已经显示出具有球形压头的压痕尺寸效应（Spary等人，2006 Phil.Mag.86 5581-93）;和图5。屈服应力的增加与压头半径的倒立方根成正比。在这里，我们进一步研究这些差异，并给出了球形压头对Cu样品的压痕尺寸效应的结果，Cu样品的晶粒尺寸范围从1微米到单晶。通过在不同晶粒度样品上使用不同半径的压头，也探索了重要的实验控制参数，即相对于晶粒度的压痕相对尺寸。当晶粒尺寸d小于投影接触面积半径的6倍时，a观察到像霍尔-帕奇（Hall-Petch）行为叠加在压痕尺寸效应上。对于d> 6a，压痕尺寸效应起主导作用。可以通过正交相加来组合这两种效果。给定压头半径和晶粒尺寸的输入值，该新的参数函数能够预测退火铜的压痕压力。

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