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The grain microstructure of  the cross-section in the workpieces deriving from 8-pass pressing process, decreases along with the strain increases, meanwhile, the phase transformations stripes have been obeserved in some crystallites, the dislocation density in the crystals decrease, and the grain boundary with equiaxed distribution has been observed as well.            ÈçÓв»ºÏÊʵĵط½»¶Ó­ÅúÆÀÖ¸Õý£¬·­ÒëµÄ²Î¿¼ÎÄÏ×£ºhttps://www.nature.com/articles/s41586-020-2082-6

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