The microstructure and mechanical properties of novel Al-Cr-Fe-Mn-Ni high-entropy alloys with trimodal distributions of coherent B2 precipitates
Autor: | G. Li, Yimo Ma, Kai Guo, Jiantao Fan, Lijie Zhang, Peng Cui, Pengfei Yu, Hu Tang, Mengdi Zhang |
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Rok vydání: | 2019 |
Předmět: |
010302 applied physics
Mean diameter Microstructural evolution Yield (engineering) Materials science Mechanical Engineering High entropy alloys 02 engineering and technology Plasticity 021001 nanoscience & nanotechnology Condensed Matter Physics Microstructure 01 natural sciences Characterization (materials science) Mechanics of Materials 0103 physical sciences General Materials Science Composite material 0210 nano-technology Strengthening mechanisms of materials |
Zdroj: | Materials Science and Engineering: A. 757:160-171 |
ISSN: | 0921-5093 |
Popis: | A series of novel Co-free AlxCrFeMnNi (x = 0.5–0.8) high-entropy alloys (HEAs) with trimodal distributions of coherent B2 precipitates was fabricated. A fundamental investigation on the microstructural evolution and mechanical properties of these trimodal alloys was conducted. Structural characterization shows that these HEAs possess complex microstructures consisting of a disordered body-centered-cubic (BCC) matrix and trimodal-size distributions of the ordered coherent B2 precipitates, (1) the primary B2 (p-B2) precipitates with a mean length of ∼2 μm located in the interdendritic region, (2) the secondary B2 (s-B2) precipitates with a mean diameter of ∼450 nm, and (3) the tertiary B2 (t-B2) precipitates with a mean diameter of ∼20 nm located in the dendritic region. The trimodal HEAs exhibit a good combination of high compressive yield strengths of 1091–1200 MPa and the large plasticity (>45%). The increments of the yield strengths caused by different strengthening mechanisms have been quantitatively and respectively estimated and compared with the experimental measurements. The study of the present trimodal BCC-B2 HEAs can provide a useful guidance for the future development of multimodal BCC-based HEAs with excellent properties. |
Databáze: | OpenAIRE |
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