Achieving heterogeneous structure in hcp Zr via electroplastic rolling

Li, Ming; Guo, Defeng; Li, Jingtao; Zhu, Shimin; Xu, Chao; Li, Kaifang; Zhao, Yadan; Wei, Bingning; Zhang, Qian; Zhang, Xiangyi

doi:10.1016/j.msea.2018.02.106

Cited by 27 publications

(10 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The inhomogeneous structure in the current work is mainly formed by the grains with different degrees of deformation in LNT rolling, which further causes to the inhomogeneous mechanical property among grains, thus leading to hetero‐deformation in tension. [ 36 ] In fact, similar results have been observed in electroplastic rolling (EPR) and RT rolling high‐purity Zr sheet, [ 37,38 ] in which the hetero‐structured zirconium alloy exhibited a combination of high strength and good ductility. The author believed that it was caused by the back‐stress strengthening and hardening of the heterogeneous structure.…”

Section: Resultssupporting

confidence: 56%

Microstructures and Mechanical Properties of a Commercial Pure Zirconium during Rolling and Annealing at Different Temperatures

Chen

et al. 2020

Adv Eng Mater

View full text Add to dashboard Cite

Zirconium (Zr) alloys have been widely applied in nuclear reactors due to their low probability of neutron capture, acceptable mechanical properties, and excellent corrosion resistance. [1-6] Zirconium alloys are commonly used as cladding tubes, fixed grids, or channel box in reactors. [2,3,6] The fabrication of Zr alloys components generally includes vacuum consumable melting, forging, extrusion, hot and cold rolling, recrystallization or stress relief annealing and so on. [7] Rolling and subsequent annealing are frequently used in the Zr alloy sheet and tube production, which actually determine the microstructure and texture, [7-10] thus playing a decisive role for the corrosion resistance, [11-14] creep resistance [15-17] and mechanical properties [18-20] of Zr alloys. Annealing can reduce the residual stress, recover the plastic deformation ability and tailor the grain size and texture, which plays a vital role in the Zr alloy fabrication. A special parameter was thus proposed to evaluate the effect of annealing. [21] The microstructure and the texture evolution during annealing are not only significantly affected by annealing condition, for example temperature [22,23] and holding time, [8,24] but also by the pre-annealing deformation. [6,25] Indeed, many research results on deformation and subsequent annealing in Zr alloys have been reported. Chen et al. [7] reported that the 30% rolling reduction combined with annealing at 580 C for 12 h imparted a superior plasticity to the Zr alloy. Kumara et al. [26] investigated the three stage of annealing in a moderately deformed Zr-4 alloy. They found that the changes in the misorientations, and corresponding rearrangements of dislocations, were the most efficient means of stress relief in Zr-4 alloy. Prakash et al. [27] investigated the microstructural and textural evolution of ZIRLO alloy during hot rolling at different temperatures. Their results show that the slip, twinning, and recrystallization played a role in the microstructure development during hot rolling. They also contributed to the texture development, lamellae break-up, and the formation of a bimodal microstructure. Jiang et al. [28] studied the effects of cold-rolling reduction, annealing temperature, and time on recrystallization behavior and kinetics of cold-rolled Zr-1Sn-0.3Nb-0.3Fe-0.1Cr alloy and found that the rate of the recrystallization increased with increasing annealing temperature and rolling reduction. Recrystallized grains nucleated preferentially at sites with high-density dislocation and deformation stored energy. Zhang et al. [29] studied the microstructure evolution and mechanical properties of Zr 98.2 Cr 1.8 during hot rolling, solution and aging treatment (STA). It was found the bimodal microstructure was the key factor to achieve high strength (ultimate tensile strength 818 MPa) and excellent ductility (18.4%) after STA at 750 C. Gerspach et al. [30] investigated the texture stability during primary recrystallization of cold-rolled Zr702 alloy and found that a small strain favored...

show abstract

Section: Resultssupporting

confidence: 56%

Microstructures and Mechanical Properties of a Commercial Pure Zirconium during Rolling and Annealing at Different Temperatures

Chen

et al. 2020

Adv Eng Mater

View full text Add to dashboard Cite

show abstract

“…Moreover, the B2 phase diffraction peaks of EPR samples broaden obviously with the increase of strain as compared with the as-quenched sample, demonstrating that high-density dislocations were introduced during the rolling deformation as can be seen by the TEM images in Figure 1(b-d). In addition, as the strain increases from 0.92 to 1.70 (see Figure 2(c,d)), the (110) B2 diffraction peak was slightly narrowed, which might be resulted from the reduction of the introduced dislocation caused by EPR deformation [23,24]. described in detail.…”

Section: Effect Of Rolling Strain On Microstructural Evolutionmentioning

confidence: 90%

Effects of strain and electropulse duration on elastic modulus of TiNi alloy

Hao

Zhang

Shan

et al. 2020

Materials Science and Technology

View full text Add to dashboard Cite

The elastic modulus of TiNi alloy was tailored by electroplastic rolling deformation and the effects of rolling strain and electropulse duration on the elastic modulus of electroplastic rolled TiNi alloy were systematically investigated. With rolling strain increasing from 0 to 1.70, the elastic modulus decreases from 61 to 30 GPa, which can be attributed to the increase in dislocation density and deformation-induced low modulus B19′ martensite phase. With electropulse duration increasing from 80 to 120 µs, the elastic modulus first decreases due to the volume fraction increase in low modulus B19′ martensite phase and then slightly increases on account of the dynamic recovery of dislocation and reverse martensite transformation resulted from electroplastic effect induced by high-energy electropulse.

show abstract

“…To improve the mechanical properties of these materials, material scientists paid a lot of attention to the deformation behavior of metals under electroplastic deformation. [7][8][9] A large number of research works have been done on the deformation behavior of various metals under electroplastic deformation conditions, including the effects of current intensity, voltage, pulse width, and frequency on the microstructure and mechanical properties. [10,11] Based on these results, deformation mechanism, including thermal effect and athermal effect (i.e., electron wind effect), was established.…”

Section: Introductionmentioning

confidence: 99%