Evolution of Ni structure at dynamic channel-angular pressing
Evolution of Ni structure at dynamic channel-angular pressing
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DOI：
10.1016/j.msea.2013.07.043
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发表时间：
2013-11
期刊：
影响因子：
6.4
通讯作者：
V. Popov;E. Popova;D. Kuznetsov;A. Stolbovsky;E. Shorohov;P. A. Nasonov;K. A. Gaan;G. Reglitz;S. Divinski;G. Wilde
中科院分区：
文献类型：
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作者：
V. Popov;E. Popova;D. Kuznetsov;A. Stolbovsky;E. Shorohov;P. A. Nasonov;K. A. Gaan;G. Reglitz;S. Divinski;G. Wilde
利用透射电镜、扫描电镜和电子背散射衍射（EBSD）分析研究了多晶Ni在动态通道角挤压（DCAP）高速剧烈塑性变形（SPD）过程中的结构演变。论证了用DCAP法在纯Ni中获得超细晶组织的可能性，并讨论了其特殊性。结果表明，DCAP对Ni组织的破碎伴随着明显的强化，DCAP的破碎机制与等通道转角挤压（ECAP）基本相同。与ECAP相比，DCAP的组织细化和强化速度更快，道次更少。DCAP获得的结构热稳定性接近ECAP，略高于高压扭转（HPT）。
Evolution of structure of polycrystalline Ni subjected to high-speed severe plastic deformation (SPD) by dynamic channel-angular pressing (DCAP) has been studied by transmission and scanning electron microscopy and electron back-scatter diffraction (EBSD) analysis. Possibility of obtaining ultra-fine grained structure in pure Ni by DCAP is demonstrated, and its specific features are discussed. It is shown that fragmentation of Ni structure by DCAP is accompanied with significant strengthening, the fragmentation mechanism at DCAP being in general the same as at equal-channel angular pressing (ECAP). The refinement of structure and strengthening at DCAP occur faster, by less number of passes than at ECAP. The thermal stability of the structure obtained by DCAP is close to that after ECAP, and is somewhat higher than after high pressure torsion (HPT).