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In metals, the thinner the grain is, the greater the proportion of grain boundaries is. when the movement of the dislocation occurs on the grain boundary, the metals get an larger effect of pinning, so that the tensile strength of the material will increase. At the same time, because the size of grain is so small, boundary region, which is influenced by the grain, will relatively increase when the deformation happens, the shape variables  difference of the grain insides and the grain boundaries within the vicinity will be relatively small.The biggest character of the grain deformation is its inhomogeneity. The thinner the crystal is, the smaller the deformation of the heterogeneous nature is, and fhe chances of cracking will also decrease, therefore, the deformation which can withstand before breaking will become greater.
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