被撤回的出版物: Repetitive tube expansion and shrinking (RTES) as a novel SPD method for fabrication of nanostructured tubes (Retracted article. See vol. 621, pg. 287, 2015)

[摘要] A novel severe plastic deformation (SPD) technique entitled repetitive tube expansion and shrinking (RTES) is introduced for producing ultra-fine grained tubular parts. This method includes two different half-cycles and is based on pressing a tubular part through an angular channel die with two shear zones. Because of inherent capabilities, this method imposes extremely high plastic strains in parts without any geometrical change. RTES was applied to commercial AZ91 alloy and the ability of this process in significant grain refinement of tubular samples is determined even after single cycle. At room temperature the yield and ultimate tensile strength of the RTES processed specimens is higher than that of the as-cast state due to the grain refinement during RTES. Furthermore, microhardness distribution through tube thickness is proposed the hardness increasing to similar to 80Hv from the initial value of similar to 50Hv after one cycle of RTES. (C) 2013 Elsevier B.V. All rights reserved.

[发布日期] 2014-02-24

[效力级别]  Retracted Publication

[关键词] Severe plastic deformation;Ultrafine grain;Micro-hardness;Repetitive tube expansion and shrinking;AZ91