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The processing of difficult-to-work alloys by ECAP with an emphasis on magnesium alloys

2007; Elsevier BV; Volume: 55; Issue: 14 Linguagem: Inglês

10.1016/j.actamat.2007.04.043

1873-2453

Roberto B. Figueiredo, Paulo Roberto Cetlin, Terence G. Langdon,

Metal Forming Simulation Techniques

The equal-channel angular pressing of pure metals is conducted most expeditiously by pressing at room temperature using a die with a channel angle of 90°. However, these conditions may lead to cracking of the billets or massive segmentation when applied to hard and difficult-to-work alloys. This paper uses finite element modeling to explore the procedures for successfully pressing these more complex materials. Separate models are developed using channel angles of 90°, 110° and 135° for materials having strain rate sensitivities of 0, 0.2 and 0.4. The calculations show that cracking and segmentation may be reduced or eliminated by increasing the strain rate sensitivity and/or increasing the channel angle within the die. The magnitude of the imposed damage is evaluated for each condition using a macroscopic damage criterion. It is demonstrated that the predicted results are in good agreement with experimental data obtained using a ZK60 magnesium alloy.