Investigation of deformation mechanisms in annealed Al0.35CoCrFeNi complex concentrated alloy by acoustic emission technique during tension

IF 5.5 2区 材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING
M. Štamborská , T. Pelachová , P. Múčka , A. Klimová , I. Petryshynets
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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.
声发射技术研究Al0.35CoCrFeNi复合浓缩合金拉伸变形机制
利用声发射技术研究了Al0.35CoCrFeNi复合浓缩合金退火后的拉伸变形机理。合金的显微组织为500 μm等轴晶。研究了三种微观组织:单相和两种不同类型和尺寸的沉淀硬化变体。在700℃退火后,晶粒内部出现了L12相的纳米沉淀和具有有序体心立方晶体结构(BCC(B2))的片状沉淀。在晶界处观察到BCC(B2)和σ-FeCr颗粒。在900℃退火时,合金中形成了较粗的BCC(B2)析出相。与单相组织相比,700°C和900°C形成的沉淀硬化组织的极限抗拉强度分别提高了37.4%和19.1%。利用声发射技术跟踪了室温拉伸试验中不同显微组织的变形机理。声发射测量表明,Al0.35CoCrFeNi合金中存在位错运动和孪晶-失孪两种雪崩机制。在700℃退火的样品中,EBSD观察到强烈的孪晶形成趋势,这与声发射信号的观察结果一致。该研究突出了声发射技术在先进合金复杂变形行为实时监测和表征中的有效性。
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来源期刊
Materials Characterization
Materials Characterization 工程技术-材料科学:表征与测试
CiteScore
7.60
自引率
8.50%
发文量
746
审稿时长
36 days
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.
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