Cuncai Zhang’s research while affiliated with Southwest University and other places

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Publications (3)


Texture development and tensile properties of Mg–Yb binary alloys during hot extrusion and subsequent annealing
  • Article

June 2021

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31 Reads

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54 Citations

Journal of Magnesium and Alloys

Lu Li

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Cuncai Zhang

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Hao Lv

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[...]

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Jingwen Jiang

Ytterbium (Yb) containing magnesium alloys have aroused extensive interest due to their excellent mechanical properties after thermomechanical processing and heat treatment. Unfortunately, the sole effect of Yb addition on the microstructure and mechanical properties of pure Mg matrix remains uncertain to date. In this work, the effects of Yb concentration on the texture development and tensile properties of pure Mg matrix during hot extrusion and the subsequent annealing were systematically investigated. The results revealed that the constitutional supercooling induced by Yb addition refined the as-cast microstructure but exerted a negligible effect on the original columnar grain morphology. When extruded at 300 °C, the dynamic recrystallization (DRX) process was considerably retarded. The in-grain misorientation axes (IGMA) analysis combined with TEM observation indicated that non-basal slips operated with increasing Yb concentration. Specifically, the prismatic 〈a〉 slip should be robustly activated in Mg–1.0 Yb extrudate, promoting the formation of the texture with {10–10} plane normal to the extrusion direction (ED), while for the Mg–2.0 Yb counterpart, the increased activity of pyramidal 〈c + a〉 slip and the relaxation of basal/<c + a> dislocations generated an ED-tilted texture component. The preferential grain growth dominated the subsequent annealing texture development at 400 °C when a comparable grain size was achieved. An obvious ED-tilted texture intensity with the peak around 〈–12–13〉 was observed in Mg–2.0 Yb alloy, which was primarily caused by grains with the basal orientation vanished and with the non-basal orientations intensified due to a higher concentration of Yb solute. Favored by the grain refinement, the Mg–2.0 Yb extrudate exhibited a high tensile yield strength of 304 ± 3.5 MPa, while the subsequently annealed counterpart presented a favorable elongation to failure of 14.8 ± 1.2%, which mainly due to the homogeneous grain structure, weak ED-tilted texture, and dissolution of coarse phases after high-temperature annealing.


Effects of Yb concentration on recrystallization, texture and tensile properties of extruded ZK60 magnesium alloys

May 2020

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14 Reads

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20 Citations

Materials Science and Engineering A

Microstructures and mechanical properties of as-extruded ZK60 alloys with different Yb concentrations (0, 1.0 and 2.0 wt%) were investigated. The results showed that Yb addition effectively refined the recrystallized grains and resulted in dense Mg–Zn–Yb nano-precipitates. With increasing Yb concentration, sufficient boundary drag was provided by solute clustering and high-density precipitates, inhibiting the grain boundary bulging. Meanwhile, the decreased stacking fault energy retarded dynamic recovery and led to an increased population of shear bands, extension twins and dislocations, promoting the formation and rotation of sub-grains. These facilitated the transition of the dominant nucleation mechanism from discontinuous dynamic recrystallization (DRX) to continuous DRX. Moreover, Yb addition disrupted the tendency for developing an intense basal texture during extrusion and the “Rare-Earth” (RE) texture was generated in the ZK60–2wt% Yb (ZYbK620) extrudate. It demonstrated that with Yb solute, the comprehensive effects including nucleation along extension twin boundaries preserving an initial “Rare-Earth” orientation, preferential grain growth along the non-basal planes and the opposite lattice rotation triggered by increased activity of pyramidal <c + a> slip contributed to the c-axis rotation of DRX grains to the extrusion direction. Favored by the grain refinement, nano-precipitates dispersion and RE texture, the tensile properties of extruded ZYbK620 alloy were considerably improved in comparison with the Yb-free counterpart, achieving a good strength-ductility balance with the ultimate tensile strength of 378 ± 1.5 MPa, tensile yield strength of 237 ± 2.3 MPa and elongation to failure of 17.6 ± 2.0%, respectively.


Ultrafine-grained Mg–Zn–Yb–Zr alloy with simultaneously improved strength and ductility processed by axisymmetric hot extrusion

December 2019

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13 Reads

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23 Citations

Vacuum

The evolution of microstructure and mechanical properties of Mg–6.0 Zn–2.0 Yb–0.5 Zr alloy during axisymmetric hot extrusion was tracked. The initial bimodal-grained sample with most nanoprecipitates presented an ultra-high ultimate tensile strength (UTS) of ~436 MPa and a lower elongation (EL) of ~14.1% along the extrusion direction (ED), while the fully recrystallized ultrafine-grained (UG) sample with less precipitates exhibited a favorable balance in UTS and EL of ~393 MPa and ~19.1%, respectively. The Mg–Zn–Yb thermostable nanoprecipitates present in the alloy improved its strength, and the tilted weak texture that was rarely observed in the axisymmetric extrusion contributed to the ductility enhancement. The present work is likely to provide the fundamental insight into the underlying mechanisms of achieving the strength-ductility synergy via precipitation and texture tailoring in a newly developed Yb-alloyed Mg alloy with conventional and readily available processing technology.

Citations (3)


... As illustrated in Figure 3d, both nucleation and grain growth inhibition contribute to the weakening of the basal texture. In addition to elements, like Gd and Y, which are recognized for their effectiveness in optimizing texture, Ce, Yb, and Nd are often investigated for their potential to alter the texture of magnesium alloys [55][56][57][58]. In the drawing process of Mg-Nd-Zn-Zr alloy, as shown in Figure 4a, both the grain size and the second-phase particle size initially increase with the drawing temperature and then decrease [59]. ...

Reference:

Research Progress on Texture Regulation of Rare-Earth Magnesium Alloys
Texture development and tensile properties of Mg–Yb binary alloys during hot extrusion and subsequent annealing
  • Citing Article
  • June 2021

Journal of Magnesium and Alloys

... Furthermore, the Yb demonstrated the capability to combine with Zn elements, leading to advantageous alterations in the grain structure and mechanical properties. Li et al. [32] reported that adding Yb into ZK60 alloy forms MgZnYb particles, which effectively reduced the dynamic precipitated β′ phase. The MgZnYb particles promotes grain refinement by particle stimulated nucleation during the recrystallization process. ...

Effects of Yb concentration on recrystallization, texture and tensile properties of extruded ZK60 magnesium alloys
  • Citing Article
  • May 2020

Materials Science and Engineering A

... This alteration promoted the formation of alloy recrystallization, activated prismatic and pyramidal slip mechanisms, and reduced the {0001} pole density. In contrast to the mechanism by which the Ce element influences the texture of rare-earth magnesium alloys, the strength and elongation of rare-earth magnesium alloy rods containing the Yb element are primarily influenced by thermally stable nano-precipitates in the extrusion direction [61]. In comparison to magnesium (Mg), Yb possesses a larger atomic size and shares a similar atomic position with Gd in magnesium alloys. ...

Ultrafine-grained Mg–Zn–Yb–Zr alloy with simultaneously improved strength and ductility processed by axisymmetric hot extrusion
  • Citing Article
  • December 2019

Vacuum