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Flow mechanisms in ultrafine-grained metals with an emphasis on superplasticity

Kawasaki, Megumi ; Balasubramanian, N. ; Langdon, Terence G.

Materials Science & Engineering A, 2011, Vol.528(21), pp.6624-6629 [Tạp chí có phản biện]

ISSN: 0921-5093 ; DOI: 10.1016/j.msea.2011.05.005

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  • Nhan đề:
    Flow mechanisms in ultrafine-grained metals with an emphasis on superplasticity
  • Tác giả: Kawasaki, Megumi ; Balasubramanian, N. ; Langdon, Terence G.
  • Chủ đề: Equal-Channel Angular Pressing ; Flow Mechanisms ; Grain Boundary Sliding ; Superplasticity ; Ultrafine-Grained Metals
  • Là 1 phần của: Materials Science & Engineering A, 2011, Vol.528(21), pp.6624-6629
  • Mô tả: Highlights ► Flow behavior of ultrafine-grained metals at high temperatures is consistent with conventional coarse-grained materials. ► Excellent agreement between experiments and theory for ultrafine-grained Al alloys, Mg alloys and a Zn–Al alloy. ► Behavior is different at low temperatures where there is small-scale grain boundary sliding. An analysis was conducted to examine the flow behavior of ultrafine-grained (UFG) metals produced by severe plastic deformation (SPD) processing in equal-channel angular pressing. The results reveal two distinct types of behavior. At elevated temperatures, the analysis shows that superplastic flow is accurately described by the theoretical mechanism developed for coarse-grained metals so that flow in UFG materials may be interpreted using conventional flow mechanisms. By contrast, localized small-scale grain boundary sliding is observed during deformation at low temperatures and this is attributed to the movement of extrinsic dislocations in the non-equilibrium grain boundaries produced by SPD processing.
  • Ngôn ngữ: English
  • Số nhận dạng: ISSN: 0921-5093 ; DOI: 10.1016/j.msea.2011.05.005

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