Analysis of data on indentation load against penetration depth for bulk MgB2 crystal using indentation work and Oliver–Pharr approaches
Analysis of data on indentation load against penetration depth for bulk MgB2 crystal using indentation work and Oliver–Pharr approaches
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DOI：
10.1016/j.matchemphys.2008.04.039
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发表时间：
2008-11
影响因子：
4.6
通讯作者：
O. Uzun;N. Güçlü;U. Kölemen;O. Şahin
中科院分区：
文献类型：
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作者：
O. Uzun;N. Güçlü;U. Kölemen;O. Şahin
在室温下对MgB_2超导块材进行了300 ~ 1500 mN的维氏显微压痕试验。分析了载荷-穿透深度曲线和能量数据（绝对能量、总能量、塑性能量和弹性能量），以评估力学性能。硬度和弹性模量值计算的奥利弗-法尔法和压痕法的工作。压痕硬度和弹性模量的功直接从压痕能量计算，而不需要估计位移、面积或体积，这可能是耗时且不准确的。结果表明，硬度和弹性模量随载荷的减小而增大（即压痕尺寸效应）。此外，压痕法计算的硬度和弹性模量与Oliver-Pharr法在高峰载荷下的计算结果有很好的相关性。计算了描述材料性质的一些具体的材料常数，如总能量、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。
Vickers microindentation tests were carried out on a bulk MgB2superconductor with the load of ranging from 300 to 1500mN 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.