Descriptors for High Throughput in Structural Materials Development

Abstract

The development of novel structural materials with increasing mechanical requirements is a very resource-intense process if conventional methods are used. While there are high-throughput methods for the development of functional materials, this is not the case for structural materials. Their mechanical properties are determined by their microstructure, so that increased sample volumes are needed. Furthermore, new short-time characterization techniques are required for individual samples which do not necessarily measure the desired material properties, but descriptors which can later be mapped on material properties. While universal micro-hardness testing is being commonly used, it is limited in its capability to measure sample volumes which contain a characteristic microstructure. We propose to use alternative and fast deformation techniques for spherical micro-samples in combination with classical characterization techniques such as XRD, DSC or micro magnetic methods, which deliver descriptors for the microstructural state.

Short-Term Characterization of Spherical 100Cr6 Steel Samples Using Micro Compression Test

“…So-called descriptors (characteristic values) are delivered to enable a comparison of values of short-term characterization techniques to conventional material properties. The descriptor-based high-throughput approach of material characterization of the CRC 1232 is explained in detail in [18].…”

Uncertainty and Resolution of Speckle Photography on Micro Samples

“…In order to accelerate ample and expansive studies of various metal compositions and structuring treatments, a highthroughput investigation of spherical micro samples is currently considered [1]. The investigation of micro samples results in descriptors, which are connected with the mechanical properties of the macro materials [2]. However, the classical material testing methods cannot be usually applied for spherical micro samples.…”

“…However, the classical material testing methods cannot be usually applied for spherical micro samples. Major adjustments of existing methods are necessary to accommodate for the dimensions and the geometry of the micro samples or novel methods must be found [2]. Specifically, the tensile test is a typical technique for the material characterization, which gives access to the average mechanical properties through the resulting strain states.…”

“…Electrohydraulic forming is already established in the macroscopic range and is used for reducing or expanding tubes and for processing sheet metal. First investigations regarding forming of bulk samples [7] and micro spheres [2] are reported.…”

“…The principle of emulating the tensile test for spherical micro samples was previously introduced as the combination between the incremental electrohydraulic extrusion as actuation unit and the digital image/speckle correlation (DISC) as strain measuring method [2]. Uniaxial loading of the micro samples is realized by extrusion into deep dies with different forming stages that represent defined stress and strain loads.…”