The influence of nanosized precipitates on Portevin-Le Chatelier bands and surface roughness in AlMgScZr alloy
The influence of nanosized precipitates on Portevin-Le Chatelier bands and surface roughness in AlMgScZr alloy
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DOI：
10.1016/j.jmst.2021.01.044
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发表时间：
2021
影响因子：
10.9
通讯作者：
Ya-Xuan Duan;Han Chen;Zhe Chen;Lei Wang;Mingliang Wang;Jun Liu;Fengguo Zhang;Haowei Wang
中科院分区：
文献类型：
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作者：
Ya-Xuan Duan;Han Chen;Zhe Chen;Lei Wang;Mingliang Wang;Jun Liu;Fengguo Zhang;Haowei Wang
研究了不同析出相-位错相互作用（位错剪切和旁通机制）对AlMgScZr合金PLC带及其表面粗糙度的影响。用共聚焦显微镜定量测量了三维表面粗糙度。研究发现，可剪切析出相的引入增加了应力幅值，降低了PLC条带数和表面粗糙度。随着可剪切析出相向不可剪切析出相的转变，应力幅值减小，PLC带数增加，表面粗糙度增大。通过定量分析析出物的强化机理，探讨了析出物对PLC条带和表面粗糙度的影响。此外，我们的研究表明，可剪切析出物可以通过减少PLC带的数量来降低表面粗糙度，这对设计具有理想力学性能和表面质量的结构材料具有指导意义。
The influence of different precipitate-dislocation interactions, namely dislocation shearing and bypassing mechanisms, on PLC bands and the resultant surface roughness in AlMgScZr alloy was investigated. Three-dimensional surface roughness was quantitatively measured by confocal microscopy. We find that the introduction of shearable precipitates increases the stress amplitude, decreases the PLC bands number and surface roughness. However, the stress amplitude decreases, the PLC bands number and surface roughness increase with shearable precipitates turning to nonshearable precipitates. By analyzing the precipitation strengthening mechanisms quantitatively, the influence of precipitates on PLC bands and the resultant surface roughness was explored. Furthermore, our study demonstrates that the shearable precipitates can decrease the surface roughness by decreasing the number of PLC bands, which is instructive for designing structural materials with desirable mechanical property and surface quality.