Mechanical properties and cold cracking evaluations of four 7××× series aluminum alloys using a newly developed index

Li, H.X.; Bai, Q. L.; Li, Y.; Du, Qiang; Katgerman, L.; Zhang, J.S.; Zhuang, Linzhong

doi:10.1016/j.msea.2017.05.069

Cited by 10 publications

(1 citation statement)

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“…Therefore, as the billet size increases, it is more and more difficult to obtain the uniformity of the melt temperature field. Especially in the primary cooling area that is in contact with the graphite ring, the non-uniform melt temperature leads to a non-uniform solidification shell which exhibits remarkable thermal stresses and strains, and is prone to wrinkles, segregation tumors and even leaks of billets [ 10 , 11 ]. To reduce the heat extraction rate and the thermal strain during the DC casting process, the wiper is implemented to divert the free falling water from the billet surface, thus, drastically reducing the heat extraction rate [ 12 ].…”

Section: Introductionmentioning

confidence: 99%

Microstructures and Macrosegregation of Al–Zn–Mg–Cu Alloy Billet Prepared by Uniform Direct Chill Casting

Zhou

Luo

Zhang³

et al. 2021

Materials

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In this study, large-sized Al–Zn–Mg–Cu alloy billets were prepared by direct chill casting imposed with annular electromagnetic stirring and intercooling; a process named uniform direct chill casting. The effects of uniform direct chill casting on grain size and the alloying element distribution of the billets were investigated and compared with those of the normal direct chill casting method. The results show that the microstructures were refined and the homogeneity of the alloying elements distribution was greatly improved by imposing the annular electromagnetic stirring and intercooling. In uniform direct chill casting, explosive nucleation can be triggered, originating from the mold wall and dendrite fragments for grain refinement. The effects of electromagnetic stirring on macrosegregation are discussed with consideration of the centrifugal force that drives the movement of melt from the central part towards the upper-periphery part, which could suppress the macrosegregation of alloying elements. The refined grain can reduce the permeability of the melt in the mushy zone that can restrain macrosegregation.

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Section: Introductionmentioning

confidence: 99%