Evading the low formability dilemma in Al-Zn-Mg-Cu alloys via heterogeneous structure

Wang, Congcong; Guo, Muxing; Yu, Kangcai; Dong, Xueguang; Zhuang, Linzhong

doi:10.1016/j.matchar.2022.112295

Cited by 7 publications

(2 citation statements)

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“…The Lankford’s coefficient of the alloy was also predicted using the visco-plastic self-consistent (VPSC) model [ 19 , 20 ]. In the model, which has been used extensively to successfully simulate plastic anisotropy of sheet metals [ 21 , 22 ], each grain within a polycrystalline material is treated as an elliptical visco-plastic inclusion embedded in an anisotropic homogeneous equivalent medium (HEM). In the VPSC model, the strain rate of individual grains can be described in the form of a power law,

where

, and n represent the strain rate within a grain, reference shear strain rate, the Schmid tensor associated with slip system s , the stress in the grain, the threshold stress associated with slip system s , and the rate-sensitivity related exponent, respectively.…”

Section: Methodsmentioning

confidence: 99%

“…The Lankford's coefficient of the alloy was also predicted using the visco-plastic self-consistent (VPSC) model [19,20]. In the model, which has been used extensively to successfully simulate plastic anisotropy of sheet metals [21,22], each grain within a polycrystalline material is treated as an elliptical visco-plastic inclusion embedded in an anisotropic homogeneous equivalent medium (HEM). In the VPSC model, the strain rate of individual grains can be described in the form of a power law, .…”

Section: Methodsmentioning

confidence: 99%

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Suppressed Plastic Anisotropy via Sigma-Phase Precipitation in CoCrFeMnNi High-Entropy Alloys

Kim,

Jung,

Bae

2024

Materials

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The effect of sigma-phase precipitation on plastic anisotropy of the equiatomic CoCrFeMnNi high-entropy alloy was investigated. Annealing at 700 °C after cold-rolling leads to the formation of the Cr-rich σ phase with a fraction of 2.7%. It is experimentally found that the planar anisotropy (∆r = −0.16) of the CoCrFeMnNi alloy annealed at 700 °C is two times lower than that of the alloy annealed at 800 °C (∆r = −0.35). This observation was further supported by measuring the earing profile of cup specimens after the deep drawing process. The plastic strain ratio, normal anisotropy, and planar anisotropy were also predicted using the visco-plastic self-consistent model. The results indirectly indicated that the reduction of plastic anisotropy in alloy annealed at 700 °C can be attributed to the formation of the σ phase.

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