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首页> 外文期刊>Journal of Materials Research >A model for the indentation size effect in polycrystalline alloys coupling intrinsic and extrinsic length scales
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A model for the indentation size effect in polycrystalline alloys coupling intrinsic and extrinsic length scales

机译:多晶合金耦合内在和外在长度尺度的压痕尺寸效应模型

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摘要

The measured hardness of a metal crystal depends on a variety of length scales. Microstructural features, such as grain size and precipitate spacing, determine the intrinsic material length scale. Extrinsic (test) length scales, such as the indentation depth, lead to the indentation size effect (ISE), whereby it is typically found that smaller is stronger. Nix and Gao [J. Mech. Phys. Solids 46, 411 (1998)] developed a widely used model for interpreting the ISE based on forest hardening in single crystalline pure metals. This work extends that model to consider the hardness of polycrystals and alloys, as well as introducing a finite limit to the hardness at very small extrinsic length scales. The resulting expressions are validated against data from the literature. It is shown that a reasonable estimate of the intrinsic material length scale can be extracted from a suite of hardness tests conducted across a range of indentation depths using spherical indenters of various radii.
机译:金属晶体的测量硬度取决于各种长度尺度。微观结构特征,如晶粒尺寸和沉淀间隔,确定内在材料长度尺度。外在(测试)长度尺度,例如压痕深度,导致压痕尺寸效应(ISE),从而通常发现更小的更强。 nix和gao [机械。物理。实体46,411(1998)]开发了一种广泛使用的模型,用于根据单晶纯金属中的森林硬化来解释ise。这项工作扩展了模型,以考虑多晶和合金的硬度,以及在非常小的外部长度尺度下对硬度引入有限的限制。由此产生的表达式针对来自文献的数据验证。结果表明,可以从使用各种半径的球形压头在一系列压痕深度上进行的一系列压痕测试中提取内在材料长度尺度的合理估计。

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