Abstract
High throughput experimentation is a possibility to develop new materials in a short time in order to meet the demands of efficient characterisation of compositions. Thus, fundamentals of a new hardness measurement method are investigated based on laser-induced shockwaves. In this study, plasma is created with a nanosecond pulsed TEA CO2 laser on top of an indenter. Further interactions of the plasma with the high intensity laser beam result in a shockwave. The pressure of the shockwave is used to push an indenter inside a material surface. So far, the energy transfer of the shockwave on indenters is not fully understood. Therefore, pendulum experiments are conducted to calculate how much energy can be transferred from the shockwave into the indenter. For these experiments, a bob, which geometry is equal to the indenter geometry, is connected to a thread pendulum and maximum deflection angles are recorded with a high-speed camera. Under standard conditions and the assumption of a spherical expansion of the shockwave, the experiments show that with a 6 J pulse energy a shockwave energy of up to 9 μJ can be used for indentation tests.
Highlights
Conventional material developments are based on expensive experimental investigations of different material properties
The deviation increases if the focal position is shifted
The deviation increases when the laser beam is below the bob (z = -1 mm)
Summary
Conventional material developments are based on expensive experimental investigations of different material properties. To meet the demands of efficient identification of compositions, which pursue the objective to realizing a specific performance profile of a material, high-throughput experimentation in materials science has been recognized as a new scientific approach to generate knowledge [1]. A new method was presented in [2] and is based on laser induced shockwaves to establish a new high throughput measurement method. The induced depth and diameter in the material is measured and can be correlated with the material hardness. It was shown that the plasma temperature increases up to 19000 K [4] above the indenter, no significant heating of the tested sheet underneath the indenter is measured during the indentation process [5]
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