The role of indenter radius on spherical indentation of high purity magnesium loaded nearly parallel to the c-axis
The role of indenter radius on spherical indentation of high purity magnesium loaded nearly parallel to the c-axis
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DOI：
10.1016/j.scriptamat.2017.04.039
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发表时间：
2017-08
影响因子：
6
通讯作者：
G. Nayyeri;Warren J. Poole;C. Sinclair;S. Zaefferer
中科院分区：
文献类型：
--
作者：
G. Nayyeri;Warren J. Poole;C. Sinclair;S. Zaefferer
基于压头半径对加载几乎平行于c轴的镁合金球形压痕的影响的研究，本文提出了两个主要贡献。首先说明了高纯镁在球形压痕中表现出很强的压痕尺寸效应。对于无限大的压头半径，通过外推RSS数据，估算了基面滑移和拉伸孪晶的CRSS。其次，研究表明，在卸载过程中产生的孪晶数量取决于压头尺寸、压痕深度以及压头下的塑性应变和应力的大小。
The current work proposes two main contributions based on a study of the effect of indenter radius on spherical indentation of magnesium where loading is nearly parallel to the c-axis. First, it is illustrated that high purity magnesium shown a strong indentation size effect for spherical indentation. The CRSS for basal slip and extension twinning are estimated by extrapolation of the RSS data for an infinitely large indenter radius. Second, it is shown that the number of twins which de-twin during unloading depends on the indenter size, indentation depth, and the magnitude of the plastic strain and stress under the indenter.