Leitner A, Maier-Kiener V, Kiener D
Department Materials Physics, Montanuniversität Leoben, Leoben, Austria.
Department Physical Metallurgy and Materials Testing, Montanuniversität Leoben, Leoben, Austria.
Mater Res Lett. 2017 Nov 3;5(7):486-493. doi: 10.1080/21663831.2017.1331384. eCollection 2017 Nov.
Modern nanoindentation devices are capable of dynamic experimentations, which allow us to exploit instrumented hardness tests extensively. Beside the assets of recording mechanical properties continuously over displacement, there are ongoing debates whether the superimposed force alters the material's hardness. We will show for a broad range of materials that significant hardness differences are noted between dynamic and static tests, even for large displacements. Those mainly result from a changing indentation strain-rate during the hold segment at peak load. This fact must be implicitly considered in studies using static indentation tests to guarantee comparability of obtained nanoindentation hardness values and derived quantities.
现代纳米压痕设备能够进行动态实验，这使我们能够广泛地利用仪器化硬度测试。除了能够在位移过程中连续记录力学性能外，关于叠加力是否会改变材料硬度的争论仍在继续。我们将表明，对于多种材料，即使在大位移情况下，动态测试和静态测试之间也存在显著的硬度差异。这些差异主要源于峰值载荷保持阶段压痕应变率的变化。在使用静态压痕测试的研究中，必须隐含地考虑这一事实，以确保所获得的纳米压痕硬度值和派生量具有可比性。
