Extensive disordering in long-range-ordered Cu₃Au induced by severe plastic deformation studied by transmission electron microscopy

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• 作者：C. Rentenberger ; H.P. Karnthaler
• 关键词：Severe plastic deformation ; Transmission electron microscopy ; Nanocrystalline alloys ; Order– ; disorder phenomena ; Antiphase boundary tubes
• 刊名：Acta Materialia
• 出版年：2008
• 期刊代码：1_13596454
• 类别：ms
• 出版时间：June 2008
• 卷：56
• 期：11
• 页码：2526-2530
• 文件大小：677 K

摘要

Bulk nanocrystalline materials can be made by severe plastic deformation. In L1₂ long-range-ordered alloys, this leads to extensive disordering which influences the highly improved properties of these nanocrystalline alloys. Transmission electron microscopy methods were applied to Cu₃Au; both diffraction contrast images and diffraction patterns reveal that disordering takes place locally. It is concluded that in addition to disordering by the refinement of the grown-in antiphase boundary domains, the formation of antiphase boundary tubes is a prominent process of disordering. The latter is facilitated by the fact that, unlike dislocations, antiphase boundary tubes can be stored at a very high density without causing long-range stresses. The local disordering indicates that the nanocrystalline structure nucleates inhomogeneously in the highly strained disordered regions.