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Microstructure, mechanical properties and wear resistance of an Al–Mg–Si alloy produced by equal channel angular pressing

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progress in Natural Science:Materials International 2020年第4期30卷 485-493页

作者： Manping liu Jian chen Yaojun lin Zhoulei Xue Hans J.Roven p?l c.skaret School of Materials Science and Engineering Jiangsu University School of Materials Science and Engineering Wuhan University of Technology Department of Materials Science and Engineering Norwegian University of Science and Technology (NTNU)

Microstructure, mechanical properties and wear resistance in an ultrafine-grained Al–Mg–Si alloy fabricated utilizing a combination of equal channel angular pressing(EcAp) and dynamic aging were investigated in this paper. The results indicated that the grain size of the EcAp alloy was significantly refined, i.e., to ～239 nm after three EcAp passes. Meanwhile, the yield and tensile strength of the EcAped material reached 340 Mpa and445 Mpa, respectively, while maintaining a significant uniform elongation of 14%. Wear resistance results demonstrated that the wear rate, wear depth and width of the EcAped material decreased in comparison with the solution-treated(SST) and peak-aged(T6) conditions under a load range of 5–25 N. The adhesive wear that occurs in the undeformed specimens at 10 N does not appear in the EcAped specimen at the same load, indicating that the EcAped specimen delay the appearance of more serious wear mechanisms under certain *** cooperative interaction of high density nano-scale β" precipitates and dislocations resulted in a combination of super-high strength and good work hardening ability which suppressed the extension of cracks between the friction layer and the plastic deformation zone. As a consequence, the combination of EcAp and dynamic aging brings a significant improvement for antifriction performance of the 6061 aluminum alloy.

关键词： Al–Mg–Si aluminum Alloy Equal channel angular pressing Dynamic aging Mechanical properties Wear resistance Wear mechanism Work hardening rate

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Aging behavior and mechanical properties of 6013 aluminum alloy processed by severe plastic deformation

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Transactions of Nonferrous Metals Society of china 2014年第12期24卷 3858-3865页

作者：刘满平蒋婷慧王俊刘强吴振杰 Ying-da YU pl c.skaret Hans J.ROVEN 材料科学与工程学院江苏省材料摩擦学重点实验室镇江212013 Department of Materials Science and Engineering Norwegian University of Science and Technology center for Advanced Materials Qatar University

Structural features, aging behavior, precipitation kinetics and mechanical properties of a 6013 Al–Mg–Si aluminum alloy subjected to equal channel angular pressing （EcAp） at different temperatures were comparatively investigated with that in conventional static aging by quantitative X-ray diffraction （XRD） measurements, differential scanning calorimetry （DSc） and tensile tests. Average grain sizes measured by XRD are in the range of 66-112 nm while the average dislocation density is in the range of 1.20×10^14-1.70×10^14 m^-2 in the deformed alloy. The DSc analysis reveals that the precipitation kinetics in the deformed alloy is much faster as compared with the peak-aged sample due to the smaller grains and higher dislocation density developed after EcAp. Both the yield strength （YS） and ultimate tensile strength （UTS） are dramatically increased in all the EcAp samples as compared with the undeformed counterparts. The maximum strength appears in the samples EcAp treated at room temperature and the maximum YS is about 1.6 times that of the statically peak-aged sample. The very high strength in the EcAp alloy is suggested to be related to the grain size strengthening and dislocation strengthening, as well as the precipitation strengthening contributing from the dynamic precipitation during EcAp.

关键词： Al-Mg-Si aluminum alloy severe plastic deformation equal-channel angular pressing aging behavior precipitation kinetics mechanical properties strengthening mechanisms

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DSc analyses of static and dynamic precipitation of an Al–Mg–Si–cu aluminum alloy

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progress in Natural Science:Materials International 2015年第2期25卷 153-158页

作者： Manping liu Zhenjie Wu Rui Yang Jiangtao Wei Yingda Yu p?l c. skaret Hans J. Roven School of Materials Science and Engineering Jiangsu Province Key Laboratory of Materials Tribology Jiangsu University Department of Materials Science and Engineering Norwegian University of Science and Technology (NTNU)

In the present investigation, both static and dynamic precipitations of an Al–Mg–Si–cu aluminum alloy after solid-solution treatment(SST)were comparatively analyzed using differential scanning calorimetry(DSc). Dynamic aging was performed in the SST alloy through equal channel angular pressing(EcAp) at different temperatures of room temperature, 110, 170, 191 and 300 1c. For comparison, static artificial aging was conducted in the SST alloy at 191 1c with two aging times of 4 and 10 h. The DSc analyses reveal that the dynamic precipitation has occurred in the EcAped samples, while the activation energies associated with the strengthening precipitates in the dynamic samples are considerably higher than the energies in the SST and static aged samples. The higher activation energies are probably attributed to the smaller grains and higher dislocation density developed after EcAp. The results in the present investigation allow the prediction of the type of the dynamic precipitates to influence the strength of the ultrafine grained alloy during EcAp at various temperatures.

关键词： Differential scanning calorimetry Al–Mg–Si–cu aluminum alloy Dynamic aging precipitation behaviors Equal channel angular pressing Severe plastic deformation

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Microstructural characterization of an Al-Mg-Si Aluminum Alloy processed by Equal channel Angular pressing

Microstructural Characterization of an Al-Mg-Si Aluminum All...

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中国材料大会2012

作者： Zhen Zhang Manping liu Yingda Yu pl c. skaret Hans J. Roven School of Materials Science and Engineering Jiangsu University Department of Materials Science and Engineering Norwegian University of Science and Technology (NTNU)

ISBN: (纸本)9783037856079;3037856076

In the present work, a peak-aged 6061 Al-Mg-Si aluminum alloy was subjected to equal channel angular pressing （EcAp） at 110℃. The microstructure of the sample was characterized by high-resolution transmission electron microscope and weak-beam dark-field method. It was shown that the dislocation density in some local areas is much lower than the average dislocation density expected in the usual alloys processed by severe plastic deformation. High-resolution transmission electron microscope observations indicated that many full dislocations were dissociated into partial dislocations connected by stacking faults. In addition, a Z-shaped defect （i.e., a type of dislocation locks） probably formed by the reactions of the partials in different {111} planes was first observed in the EcAped alloy. Furthermore, the precipitation behavior and sequence in the present EcAped sample were identified by high-resolution transmission electron microscopy.

关键词： Al–Mg-Si aluminum alloy Severe plastic deformation Dislocation Z-shaped defects Stacking faults precipitation

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