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      The Linear Thermal Expansion of Bulk Nanocrystalline Ingot Iron from Liquid Nitrogen to 300 K

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          Abstract

          The linear thermal expansions (LTE) of bulk nanocrystalline ingot iron (BNII) at six directions on rolling plane and conventional polycrystalline ingot iron (CPII) at one direction were measured from liquid nitrogen temperature to 300 K. Although the volume fraction of grain boundary and residual strain of BNII are larger than those of CPII, LTE of BNII at the six measurement directions were less than those of CPII. This phenomenon could be explained with Morse potential function and the crystalline structure of metals. Our LTE results ruled out that the grain boundary and residual strain of BNII did much contribution to its thermal expansion. The higher interaction potential energy of atoms, the less partial derivative of interaction potential energy with respect to temperature T and the porosity free at the grain boundary of BNII resulted in less LTE in comparison with CPII from liquid nitrogen temperature to 300 K. The higher LTE of many bulk nanocrystalline materials resulted from the porosity at their grain boundaries. However, many authors attributed the higher LTE of many nanocrystalline metal materials to their higher volume fraction of grain boundaries.

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          Author and article information

          Journal
          Nanoscale Res Lett
          Nanoscale Research Letters
          Springer
          1931-7573
          1556-276X
          2010
          17 September 2009
          : 5
          : 1
          : 48-54
          Affiliations
          [1 ]Shenyang National Laboratory for Materials Science, Institute of Metal Research, and International Centre for Materials Physics, Chinese Academy of Sciences, Shenyang, 110016, People’s Republic of China
          [2 ]Institute of Sciences, Dalian Fisheries University, Dalian, 116023, People’s Republic of China
          Article
          1556-276X-5-48
          10.1007/s11671-009-9441-4
          2894192
          20652151
          aca5818c-f5fe-4dbb-b5e2-9ac89673ca59
          Copyright ©2009 to the authors
          History
          : 7 August 2009
          : 9 September 2009
          Categories
          Nano Express
          Material Science
          Molecular Medicine
          Engineering, General
          Chemistry/Food Science, general
          Physics, General
          Materials Science, general
          Nanotechnology

          Nanomaterials
          severe rolling technique,bulk nanocrystallined materials,linear thermal expansion

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