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| 2023-09-19 15:01:08 | onclick： | Advances in Low Temperature Strain Hardening of Metallic Materials |
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For a long time, strain hardening of crystal materials based on dislocation theory has been regarded as one of the most important and difficult scientific problems in modern condensed matter physics and material science.Recently, Lu Lei, a researcher at Shenyang National Research Center for Materials Science, Institute of Metals, CAS, made important progress in this scientific problem. The research results were published online in Science on September 14.
The research team found that the importance of these problems stems from the fact that increasing strain hardening can improve both strength and plasticity of materials.
Studies have shown that the dislocation storage space in coarse grains is large and has the strongest strain hardening ability.Many reinforcement strategies can effectively improve material strength, but inevitably reduce dislocation storage density and significantly reduce machining hardening, as well as low temperature deformation.Trace traceability, the decrease of strain hardening ability is the root cause of strength-plasticity/toughness inversion of structural materials.
Lu Lei's team's research shows that alloys with spatial gradient sequence dislocation have excellent strength and plasticity at low temperature tensile deformation, as well as super high strain hardening ability.The low temperature ultra-high strain hardening is due to the dynamic structure refinement dominated by the dislocation initiation of multi-slip atomic scale layer.The spatial gradient sequence, dislocation cell eigenstructure and low temperature environment co-excited the strain hardening dominated by ultra-high density two-dimensional plane layer.
This new study is also the discovery of additional strengthening and machining hardening of gradient nanocrystalline twins, and the high plasticity of gradient dislocation structure.The two studies were published in Science in 2018 and 2021, respectively.Recent research has developed the strain hardening theory of crystal materials, which provides new opportunities and challenges for the development of high performance metal materials and their extreme environmental applications.
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