Background

The trend in miniaturisation of structural components and continuous development of more advanced crystal plasticity models point towards the need for understanding cyclic properties of engineering materials at the microscale. Though the technology of focused ion beam milling enables the preparation of micron-sized samples for mechanical testing using nanoindenters, much of the focus has been on monotonic testing since the limited 1D motion of nanoindenters imposes restrictions on both sample preparation and cyclic testing.

Objective/Methods

In this work, we present an approach for cyclic microcantilever bending using a micromanipulator setup having three degrees of freedom, thereby offering more flexibility.

Results

The method has been demonstrated and validated by cyclic bending of Alloy 718plus microcantilevers prepared on a bulk specimen. The experiments reveal that this method is reliable and produces results that are comparable to a nanoindenter setup.

Conclusions

Due to the flexibility of the method, it offers straightforward testing of cantilevers manufactured at arbitrary position on bulk samples with fully reversed plastic deformation. Specific microstructural features, e.g., selected orientations, grain boundaries, phase boundaries etc., can therefore be easily targeted.

中文翻译：

---

使用原位显微操作的微悬臂梁的循环变形

背景

结构部件的小型化趋势和更先进的晶体塑性模型的不断发展表明需要在微观尺度上了解工程材料的循环特性。尽管聚焦离子束铣削技术能够使用纳米压痕仪制备用于机械测试的微米级样品，但由于纳米压痕仪的有限一维运动对样品制备和循环测试施加了限制，因此大部分关注点都集中在单调测试上。

目标/方法

在这项工作中，我们提出了一种使用具有三个自由度的微操纵器设置循环微悬臂梁弯曲的方法，从而提供了更大的灵活性。

结果

该方法已通过在大块试样上制备的合金 718plus 微悬臂梁的循环弯曲得到证明和验证。实验表明，这种方法是可靠的，并且产生的结果可与纳米压痕装置相媲美。

结论

由于该方法的灵活性，它可以对在具有完全反向塑性变形的大块样品上的任意位置制造的悬臂进行简单的测试。特定的微观结构特征，例如选定的取向、晶界、相界等，因此可以很容易地被瞄准。