It is widely stated that yield stress extraction from micro-compression testing can be unreliable due to factors such as the pillar taper, pillar-punch misalignment and lateral displacement for example through discrete slip events. This study reports on how these factors can be eradicated when using digital image correlation based strain mapping. This approach is demonstrated through a conventional micropillar compression experiment using the hexagonal MAX phase system Cr₂AlC. The use of this approach enables the uncertainty of the extracted yield stress values to be significantly reduced and effectively increases the precision of critical resolved shear stress extraction for basal plane slip from ±52% to ±4% of the mean value. The findings suggest that the statistical variations commonly observed in micro-compression tests may frequently be linked to systematic errors in the stress measurements taken, and that precise evaluation of deformation statistics can only be facilitated if the pillar deformation morphology is closely monitored.

普遍认为，由于诸如立柱锥度，立柱冲头未对准和例如通过离散滑动事件引起的侧向位移等因素，从微压缩试验中提取屈服应力可能不可靠。这项研究报告了在使用基于数字图像相关性的应变映射时如何消除这些因素。通过使用六边形MAX相系统Cr ₂的常规微柱压缩实验证明了这种方法铝 这种方法的使用可以显着降低提取的屈服应力值的不确定性，并有效地将基面滑移的临界分辨剪切应力提取精度从平均值的±52％提高到±4％。这些发现表明，在微压缩试验中通常观察到的统计差异可能经常与所进行的应力测量中的系统误差有关，并且只有在密切监测立柱变形形态的情况下，才能促进对变形统计数据的精确评估。