Using an Al-Cu binary alloy to compare processing by multi-axial compression and high-pressure torsion

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• 作者：Xiaochang Xu ; Qi Zhang ; Nan Hu ; Yi Huang ; Terence G. Langdon
• 关键词：Al&ndash ; Cu alloy ; High-pressure torsion ; Homogeneity ; Multi-axial compression ; Ultrafine grains
• 刊名：Materials Science and Engineering: A
• 出版年：20 December, 2013
• 年：2013
• 卷：588
• 期：Complete
• 页码：280-287
• 全文大小：2431 K

文摘

An Al-4% Cu alloy was selected as a model material in order to compare two different procedures for imposing severe plastic deformation: multi-axial compression (MAC) and high-pressure torsion (HPT). In MAC a compressive strain is applied to prismatic samples in a sequential order along three orthogonal directions and the process is repeated to large numbers of passes in order to attain high strains. In HPT a thin disk is held between anvils and subjected to a high applied pressure and concurrent torsional straining. The results show that HPT is the optimum procedure for producing a homogeneous ultrafine-grained material. Specifically, HPT is preferable because it produces materials having a larger degree of homogeneity and the equilibrium grain sizes are smaller and the Vickers microhardness values are higher than when processing by MAC.