7SEGAL V M. Materials processing by simple shear[J]. Mater Sci Eng A, 1995, 197: 157-159.
8VALIEV R Z. Structure and mechanical properties of ultrafine grained metals[J]. Mater Sci Eng A, 1997, 234/236: 59-63.
9SEGAL V M, GOFORTH R E, HARTWIG K T. Apparatus and method for deformation processing of metals, ceramics, and other materials. US 5400633[P]. 1995.
10VALIEV R Z, ISLAMGALIEV R K, ALEXANDROV I V. Bulk nanostruetured materials from severe plastic deformation[J]. Progress in Materials Science, 2000, 45: 103-189.