Müller Christian, Zamanzade Mohammad, Motz Christian
Department of Materials Science and Methods, Saarland University, Bldg. D2.2, 66123 Saarbrücken, Germany.
Mines Saint-Etienne, Univ Lyon, CNRS, UMR 5307LGF, Centre SMS, F-42023 Saint-Etienne France.
Micromachines (Basel). 2019 Feb 11;10(2):114. doi: 10.3390/mi10020114.
We have designed a new method for electrochemical hydrogen charging which allows us to charge very thin coarse-grained specimens from the bottom and perform nanomechanical testing on the top. As the average grain diameter is larger than the thickness of the sample, this setup allows us to efficiently evaluate the mechanical properties of multiple single crystals with similar electrochemical conditions. Another important advantage is that the top surface is not affected by corrosion by the electrolyte. The nanoindentation results show that hydrogen reduces the activation energy for homogenous dislocation nucleation by approximately 15⁻20% in a (001) grain. The elastic modulus also was observed to be reduced by the same amount. The hardness increased by approximately 4%, as determined by load-displacement curves and residual imprint analysis.
我们设计了一种新的电化学充氢方法，该方法使我们能够从底部对非常薄的粗晶试样进行充氢，并在顶部进行纳米力学测试。由于平均晶粒直径大于样品厚度，这种设置使我们能够在相似的电化学条件下有效地评估多个单晶的力学性能。另一个重要优点是顶部表面不受电解质腐蚀的影响。纳米压痕结果表明，在（001）晶粒中，氢使均匀位错形核的激活能降低了约15%-20%。弹性模量也观察到降低了相同的量。通过载荷-位移曲线和残余压痕分析确定，硬度增加了约4%。
