Arigela V G, Oellers T, Ludwig A, Kirchlechner C, Dehm G
Max-Planck-Institut für Eisenforschung GmbH, 40237 Düsseldorf, Germany.
Institute for Materials, Ruhr-Universität Bochum, 44801 Bochum, Germany.
Rev Sci Instrum. 2019 Jul;90(7):073904. doi: 10.1063/1.5086261.
The study of mechanical properties of materials at high temperatures at the microstructural length regime requires dedicated setups for testing. Despite the advances in the instrumentation in these setups over the last decade, further optimization is required in order to extend the temperature range well-beyond 600 °C. Particularly, an improvement of the contact temperature measurement is required. A design with a novel approach of temperature measurement with independent tip and sample heating is developed to characterize materials at high temperatures. This design is realized by modifying a displacement controlled room temperature microstraining rig with the addition of two miniature hot stages, one each carrying the sample and indenter tip. The sample reaches temperatures of >600 °C with a 50 W diode laser system. The stages have slots for the working sample as well as a reference sample on both ends for precise temperature measurements, relying on the symmetry of the stage toward the ends. The whole setup is placed inside a custom-made steel chamber, capable of attaining a vacuum of 10 Pa. Alternatively, the apparatus can be operated under environmental conditions by applying various gases. Here, the unique design and its high temperature capabilities will be presented together with the first results of microtension experiments on freestanding copper thin films at 400 °C.
在微观结构长度尺度下研究材料在高温下的力学性能需要专门的测试装置。尽管在过去十年中这些装置的仪器设备取得了进展，但仍需要进一步优化，以便将温度范围扩展到远高于600°C。特别是，需要改进接触温度测量。开发了一种采用独立加热探头和样品的新型温度测量方法的设计，用于表征高温下的材料。这种设计是通过对位移控制的室温微应变试验台进行改造实现的，增加了两个微型热台，每个热台分别承载样品和压头尖端。使用50W二极管激光系统使样品达到>600°C的温度。热台两端为工作样品和参考样品设有插槽，依靠热台两端的对称性进行精确的温度测量。整个装置放置在一个定制的钢室内，能够达到10Pa的真空度。或者，该装置可以在环境条件下通过施加各种气体进行操作。在此，将介绍独特的设计及其高温性能，以及在400°C下对独立铜薄膜进行微拉伸实验的首批结果。
