Metallic Materials With Nano--Scale Twins

Lü, Lei; Lu, K.

doi:10.3724/sp.j.1037.2010.01422

Cited by 23 publications

(11 citation statements)

References 31 publications

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“…The formation of voids in the nanococoons is likely to be governed by the Ostwald ripening mechanism. 15 During the ripening process, the low-density nanorods are dissolved and redistributed to surfaces to minimize energy. As a result, the mesoporous structure with a narrow pore size distribution formed.…”

Section: Please Do Not Adjust Marginsmentioning

confidence: 99%

Retracted Article: Mesoporous amorphous FeOF nanococoons for high-rate and long-life rechargeable sodium-ion batteries

Chu

et al. 2015

J. Mater. Chem. A

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A novel solution plasma processing approach was developed to synthesize mesoporous amorphous FeOF nanococoons on a large scale via using NaF and FeCl3•xH2O as the precursors, and CO2 released from the hydrolysis of urea as the growth director. The obtained mesoporous amorphous FeOF nanococoons deliver a reversible capacity of 238.9 mAhg -1 at a current rate of 1 Ag -1 and show almost no degradation, even after 3000 cycles by adopting the optimized 1.0 M sodium trifluoromethanesulfonate (NaTFSA) in triglyme (TGM) as the electrolyte and applying the cut-off voltage to 1.3 V. Furthermore, the nanococoons exhibit a capacity of 190.4 mAhg −1 at an ultrahigh current density of 20 Ag −1 because of the coexisting pseudocapacitance-type reaction. Meanwhile, the attempt for commercial 18650 batteries exhibited a stable discharge capacity of 4897 mAh at 4 A for 300 cycles, which allows for consideration for this type of room-temperature battery in commercial utilization. The superior electrochemical performance of the mesoporous amorphous FeOF nanococoons is because of the collaboration of optimized electrolyte, controlling the terminate voltage to 1.3V, and its particular nanostructure, which significantly improve the ionic and electronic transport and intercalation kinetics of Na ions.

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Section: Please Do Not Adjust Marginsmentioning

confidence: 99%

Retracted Article: Mesoporous amorphous FeOF nanococoons for high-rate and long-life rechargeable sodium-ion batteries

Chu

et al. 2015

J. Mater. Chem. A

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“…Early research has found that equal channel angular pressing can effectively improve the strength of the materials and maintain its conductivity [18]. The nanotwin matrix lamellae structure can significantly increasing the strength of metal materials, and it has little effect on material's conductivity [19]. The tensile strength of CuÀCr-Zr alloy increased by 260 % after 8 passes by equal channel angular pressing and the electrical conductivity did not change significantly [20].…”

Section: Introductionmentioning

confidence: 99%

Texture and mechanical properties of single crystal copper during equal channel angular pressing by route C

Guo

Wang

et al. 2018

Materialwissenschaft Werkst

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Single crystal copper has excellent electrical and thermal conductivity, but the lower strength seriously limited its application. Traditional strengthening methods, such as alloying, will severely damage its conductivity. Severe plastic deformation is the most effective methods for increasing the metals strength and not reducing the conductivity. The microstructure and texture evolution of single crystal copper (99.999 %) during equal channel angular pressing by route C was investigated by scanning electron microscopy, X-ray diffraction, electron backscatter diffraction and transmission electron microscopy, the mechanical properties and conductivity were tested, and the influence mechanism of texture and microstructure on mechanical properties and conductivity were analyzed. The results show that during equal channel angular pressing, the original < 111 > orientation gradually changed to < 001 > , accompany lots of low-angle grain boundaries were formed. With strain increasing, the high-angle grain boundaries increased gradually, and the deformation bands with < 110 > orientation was formed in the single crystal structure, which plays a positive role on the conductivity. After 5 passes, the tensile strength of single crystal copper increased from 168 MPa to 415 MPa by route A and 385 MPa by route C, and the elongation declined sharply from 63 % to 30 % and 27.9 %, respectively. After 16 passes, the hardness increased from 60.4 HV to 130.8 HV and the conductivity only slightly down.

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“…[17][18][19] Lu found that a nano-twin matrix lamellae structure can significantly increase a material's strength and it has little effect on a material's plasticity and conductivity. 20 Xu found that ultrafine grain (UFG) pure copper with a bimodal structure is obtained and the tensile strength was sharply improved after ECAP through 12 passes. 21 Therefore, starting from the structural characteristics of a material, it is an important task of modern material science to control the microstructure to give full play to their potential performance through technological methods.…”

Section: Indroductionmentioning

confidence: 99%

Study of the strengthening and toughening mechanism for single-crystal copper during equal-channel angular pressing by route A

Guo¹,

Wei²,

Li³

et al. 2019

Mater. Tehnol.

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Single-crystal copper has received more and more attention in the important areas of the national economy due to its good electrical and thermal conductivity and elongation. Its low strength limits its application, and so strengthening methods for single-crystal copper are of great concern. Therefore, we study the strengthening and toughening mechanisms of single-crystal copper by equal-channel angular pressing (ECAP). The single-crystal copper was processed by ECAP using route A with a die (F = 105°, Y = 30°). The microstructure and texture evolution were investigated by EBSD, XRD and SEM. The tensile properties were also tested. The results show that the ECAP method can improve the strength of materials without decreasing the conductivity. Under low strain, the crystal orientation still maintains the original orientation characteristics. As the strain increases, it forms numerous deformation bands with the same direction as the matrix. The texture-transformation process is {111}<112> ® {111}<110> ® {110}<112> and {124}<211>. After 5 passes, the tensile strength increased from 168 MPa to 435 MPa, and the elongation declined from 63 % to 27.8 %. After 16 passes, the hardness increased from 60.4 HV to 125 HV, while the conductivity remained at a high level of 95 % IACS.Monokristalini~ni baker postaja zaradi svoje dobre elektri~ne in toplotne prevodnosti ter duktilnosti vse bolj popularen material na pomembnih podro~jih nacionalnih ekonomij. Zaradi nekoliko manj{e trdnosti je njegova uporabnost omejena.^e`elimo raz{iriti njegovo uporabnost, je razvoj novih metod njegovega utrjevanja zelo pomemben. Avtorji so raziskovali mehanizme utrjevanja in pove~evanja`ilavosti monokristalini~nega bakra s postopkom ECAP (iztiskovanjem pod kotom z enakim vhodom in izhodom matrice). Monokristalini~ni baker so obdelovali s postopkom ECAP z uporabo poti A, pri kateri ima orodje zunanji kot F =105°in notranji kot Y =30°. Razvoj mikrostrukture in teksture so raziskovali z EBSD, XRD in SEM. Prav tako so dolo~ili trdoto in mehanske lastnosti z nateznim preizkusom. Rezultati raziskav ka`ejo, da lahko postopek ECAP izbolj{a trdnost materiala brez poslab{anja prevodnosti. Pri majhnih deformacijah ostaja kristalna orientacija {e vedno nespremenjena. S pove~evanjem deformacije pa nastajajo {tevilni deformacijski pasovi z enako orientacijo, kot jo ima matrica. Proces pretvorbe teksture poteka v smeri {111}<112> ® {111}<110> ® {110}<112> in {124}<211>. Po 5 prehodih je natezna trdnost bakra narasla s 168 MPa na 435 MPa in raztezek je padel s 63,0 % na 27,8 %, elektri~na prevodnost pa je {e vedno ostala na visokem nivoju 95 % IACS. Klju~ne besede: monokristalini~ni baker, postopek ECAP (iztiskovanje pod kotom z enakim vhodom in izhodom matrice), tekstura, mehanske lastnosti

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Metallic Materials With Nano--Scale Twins

Cited by 23 publications

References 31 publications

Retracted Article: Mesoporous amorphous FeOF nanococoons for high-rate and long-life rechargeable sodium-ion batteries

Retracted Article: Mesoporous amorphous FeOF nanococoons for high-rate and long-life rechargeable sodium-ion batteries

Texture and mechanical properties of single crystal copper during equal channel angular pressing by route C

Study of the strengthening and toughening mechanism for single-crystal copper during equal-channel angular pressing by route A

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