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首页> 外文期刊>Materials Chemistry and Physics >Analysis Of Data On Indentation Load Against Penetration Depth For Bulk Mgb_2 Crystal Using Indentation Work And Oliver-pharr Approaches
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Analysis Of Data On Indentation Load Against Penetration Depth For Bulk Mgb_2 Crystal Using Indentation Work And Oliver-pharr Approaches

机译：压痕功和Oliver-pharr方法分析大块Mgb_2晶体压痕载荷对穿透深度的数据

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摘要

Vickers microindentation tests were carried out on a bulk MgB_2 superconductor with the load of ranging from 300 to 1500 mN at a room temperature. The load-penetration depth curves and the energy data (the absolute, the total, the plastic, and the elastic energy) were analyzed to evaluate the mechanical properties. Hardness and elastic modulus values were calculated by the Oliver-Pharr method and the work of indentation approach. The work of indentation hardness and elastic modulus were calculated directly from the energy of indentation without the need for estimating displacement, areas or volumes, which can be time consuming and inaccurate. It was found that the hardness and elastic modulus increased with decreasing load (i.e. indentation size effect). In addition, the hardness and elastic modulus calculated from the work of indentation approach seem to correlate very well with Oliver-Pharr method at high peak load. Some specific material constant describing the properties of materials were also calculated as total energy, plastic energy, elastic energy, elastic-total energy, plastic-total energy and elastic-plastic energy constants.
机译：在室温下对块状MgB_2超导体进行了维氏微压痕测试，其负载范围为300至1500 mN。分析了载荷穿透深度曲线和能量数据（绝对值，总值，塑性和弹性能）以评估机械性能。硬度和弹性模量值通过Oliver-Pharr方法和压痕法计算。压痕硬度和弹性模量的功是直接从压痕能量中计算出来的，而无需估计位移，面积或体积，这可能既费时又不准确。已经发现，硬度和弹性模量随着载荷的减小而增加（即，压痕尺寸效应）。另外，由压痕法计算出的硬度和弹性模量似乎在高峰值载荷下与Oliver-Pharr方法具有很好的相关性。一些描述材料特性的特定材料常数也被计算为总能量，塑性能量，弹性能量，弹性总能量，塑性总能量和弹塑性能量常数。

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