Measurement of the single crystal elasticity matrix of polycrystalline materials

Many engineering metals are polycrystalline, as such the elasticity, crystalline orientation and grain distribution cardinal factors in determining physical properties of material. The can be measured using a number different techniques by subset these (electron back scatter diffraction, spatially resolved acoustic spectroscopy). These measurements routinely deployed materials development. However, elasticity remains more difficult parameter to measure is rarely because existing slow cumbersome, with most current requiring laborious growth or destructive isolation single crystals. In this work we present technique that determine fast easy measurement. utilises SRAS imaging provide raw measurement velocity surfaces, input novel inverse solver mitigates problem inversion being very ill-conditioned, simultaneously solving for multiple uniquely orientated grains at once brute-force approach. This allows simultaneous determination elastic constants crystallographic orientation. Furthermore, has potential on polycrystalline minimal preparation capable high accuracy, realise errors values less than 1 GPa (?1). demonstrate good agreement EBSD (<6? disagreement average all Euler angles) line single-crystal values, an expected accuracy better 4 GPa. Experimental results presented pure ?-Ti (hexagonal), Ni exotic Ni-base alloy CMSX-4 (both cubic). With proposed method, initial been made, subsequent same sample made rapidly so real time, opening possibility on-line used monitor processes enable high-throughput screening. instrumentation approach applicable sizes down 50 µm, improving ?5 µm. Further modifications calculation will facilitate greater constants.