Effects of nanosized precipitates on the Portevin-Le Chatelier behavior: Model prediction and experimental verification

被引：13
作者：
Chen, Han [1 ]
Chen, Zhe [1 ]
Chen, Yanchi [1 ]
Ji, Gang [2 ]
Zhong, Shengyi [3 ]
Wang, Haowei [1 ]
Ke, Yubin [4 ]
Brechet, Yves [3 ,5 ]
机构：
[1] Shanghai Jiao Tong Univ, State Key Lab Met Matrix Composites, Shanghai 200240, Peoples R China
[2] Univ Lille, Unite Materiaux & Transformat, CNRS, INRAE,Cent Lille,UMR 8207, F-59000 Lille, France
[3] Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, Shanghai 200240, Peoples R China
[4] Chinese Acad Sci, Inst High Energy Phys, Spallat Neutron Source Sci Ctr, Dongguan 523803, Peoples R China
[5] Univ Grenoble Alpes, SIMAP, F-38000 Grenoble, France
来源：
MATERIALIA | 2022年 / 21卷
关键词：
Aluminum alloy; Portevin-Le Chatelier effect; Precipitates; Modeling; Dislocations; ALUMINUM-ALLOYS; CRITICAL STRAIN; SERRATED FLOW; AL(SC; ZR); ALLOYS; DEFORMATION; MECHANISMS; EVOLUTION; KINETICS; DYNAMICS; AMBIENT;
D O I：
10.1016/j.mtla.2021.101299
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The influence of homogenously-distributed nanosized Al-3(Sc, Zr) precipitates on the Portevin-Le Chatelier (PLC) behavior in a model AlMgScZr alloy was investigated by experimental characterization and theoretical modeling. A remarkable advantage of the selected alloy is that the solute Mg concentration remains unchanged during the precipitation of Al-3(Sc, Zr) nanoparticles, which effectively rules out the influence of solute concentration change on PLC. Transmission electron microscopy (TEM) and small angle neutron scattering (SANS) were used for quantitative characterization of precipitates and evaluation of key modeling parameters. By comparing the results for AlMg (without precipitates) and AlMgScZr (with precipitates) the effects of precipitates on the PLC phenomenon were clarified. It was found that the precipitates decrease the critical strain for the occurrence of PLC. Further, by evaluating dislocation densities of both alloys via synchrotron X-ray diffraction (XRD), the influence of precipitates on PLC was clarified by revealing the different roles of solute atoms and precipitates played in the dislocation-dislocation interaction. A model was proposed to account for these phenomena.
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页数：14
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