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首页> 外文期刊>Materials Science & Engineering. A, Structural Materials: Properties, Microstructure and Processing >Deformation and strain distribution in plasma sprayed nickel-aluminum coating loaded by a spherical indenter
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Deformation and strain distribution in plasma sprayed nickel-aluminum coating loaded by a spherical indenter

机译：球形压头加载的等离子喷涂镍铝涂层的变形和应变分布

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摘要

The deformation underneath a spherical indent was investigated on samples prepared by the bonded-interface technique from a plasma sprayed nickel-5 percent aluminum coating. Prior to the spherical indentation a set of Vickers micro-indents was produced as fiduciaries on one of the cross-sections. This allowed the calculation of plastic strain components from the relative displacements of micro-indents during subsequent surface indentation. Using a modified procedure based on a method proposed by Tabor [1], stress-strain curve was evaluated by measuring the contact radii of spherical indentations produced at several different loads. The derived stress-strain relationship was used in 2D and 3D finite element models to estimate the plastic deformation field under the indenter. The comparison between the measured and calculated strain profiles revealed notable differences. The normal plastic strain in the direction along the vertical axis of indentation displayed higher values directly under the indenter compared to the finite element analysis which predicted lower values under the indenter and less rapid decrease of the plastic strain with depth. The differences were attributed to the compaction of the lamellar structure in the plasma sprayed coatings. The compaction of the lamellae was directly observed on polished coating cross-sections.
机译：研究了通过粘结界面技术从等离子喷涂镍5％铝涂层制备的样品上球形凹痕下方的变形。在球形压痕之前，在一个横截面上制作了一组维氏微压痕作为基准。这样就可以根据后续表面压痕过程中微压痕的相对位移来计算塑性应变分量。使用基于Tabor [1]提出的方法的改进程序，通过测量在几种不同载荷下产生的球形压痕的接触半径来评估应力-应变曲线。导出的应力-应变关系用于2D和3D有限元模型中，以估算压头下的塑性变形场。测量和计算的应变曲线之间的比较显示出显着差异。与有限元分析相比，沿着压痕垂直轴方向的法向塑性应变在压头正下方显示较高的值，而有限元分析预测压头下的塑性应变将较低，并且随着深度的减小，塑性应变的减小较快。差异归因于等离子喷涂涂层中层状结构的压实。在抛光的涂层横截面上直接观察到薄片的压实。

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