M. Štamborská , T. Pelachová , P. Múčka , A. Klimová , I. Petryshynets
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引用次数: 0
Abstract
This study investigates the deformation mechanisms of annealed Al0.35CoCrFeNi complex concentrated alloy using the acoustic emission technique during tensile testing. The microstructure of the alloy consists of equiaxed grains with a size of 500 μm. Three microstructures were examined: a single-phase and two precipitation hardened variants with different type and size of precipitates. After annealing at 700 °C, nanoprecipitates of L12 phase and plate-like precipitates with ordered body-centered cubic crystal structure (BCC(B2)) were identified inside the grains. At the grain boundaries BCC(B2) and σ-FeCr particles were observed. During annealing at 900 °C, coarse BCC(B2) precipitates were formed in the alloy. Compared to the single phase microstructure, the measured ultimate tensile strength of precipitation hardened structures formed at 700 °C and 900 °C was higher by 37.4 % and 19.1 %, respectively. The acoustic emission technique was used to track deformation mechanisms of different microstructures during room temperature tensile tests. Acoustic emission measurements show the coexistence of two avalanche mechanisms, dislocation movement and twinning-detwinning, in the studied Al0.35CoCrFeNi alloy. A strong trend of twin formation was observed by EBSD in the samples annealed at 700 °C, which is consistent with the observation of acoustic emission signals. This research highlights the efficacy of the acoustic emission technique in real-time monitoring and characterization of complex deformation behaviors in advanced alloys.
期刊介绍:
Materials Characterization features original articles and state-of-the-art reviews on theoretical and practical aspects of the structure and behaviour of materials.
The Journal focuses on all characterization techniques, including all forms of microscopy (light, electron, acoustic, etc.,) and analysis (especially microanalysis and surface analytical techniques). Developments in both this wide range of techniques and their application to the quantification of the microstructure of materials are essential facets of the Journal.
The Journal provides the Materials Scientist/Engineer with up-to-date information on many types of materials with an underlying theme of explaining the behavior of materials using novel approaches. Materials covered by the journal include:
Metals & Alloys
Ceramics
Nanomaterials
Biomedical materials
Optical materials
Composites
Natural Materials.