Influence of dislocation-solute atom interactions and stacking fault energy on grain size of single-phase alloys after severe plastic deformation using high-pressure torsion
Influence of dislocation-solute atom interactions and stacking fault energy on grain size of single-phase alloys after severe plastic deformation using high-pressure torsion
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DOI：
10.1016/j.actamat.2014.01.036
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发表时间：
2014-05-01
期刊：
影响因子：
9.4
通讯作者：
Horita, Zenji
中科院分区：
文献类型：
--
作者：
Edalati, Kaveh;Akama, Daichi;Horita, Zenji
对几种纯金属（镁、铝、铁、钴、镍、铜、锌、钯和银）和单相Al-Mg、Al-Ag、Al-Cu、Cu-Al、Cu-Zn、Pd-Ag、Ni-Fe和Ni-Co合金进行了高压扭转（HPT）剧烈塑性变形。合金化使合金的稳态晶粒尺寸减小，硬度增加。结果表明，合金化晶粒细化的主要因素是溶质-基体原子尺寸失配和模量相互作用对刃型位错迁移率的影响。对于所选的合金，不像纯金属，晶粒尺寸几乎是不敏感的熔化温度，和纯金属一样，没有系统的相关性之间的晶粒尺寸和堆垛层错能（化学相互作用）或晶粒尺寸和价电子（电相互作用）。幂律关系的存在下，与n近似为0.56，由剪切模量归一化的硬度和由伯格斯矢量归一化的晶粒尺寸之间表示晶界的硬化的大的贡献。固溶效应对总硬化的贡献似乎是
Several pure metals (magnesium, aluminum, iron, cobalt, nickel, copper, zinc, palladium and silver) and single-phase Al-Mg, Al-Ag, Al-Cu, Cu-Al, Cu-Zn, Pd-Ag, Ni-Fe and Ni-Co alloys were processed by severe plastic deformation using high-pressure torsion (HPT). The steady-state grain size was decreased and hardness increased by alloying in all the systems. It was shown that the dominant factor for extra grain refinement by alloying was due to the effect of solute matrix atomic-size mismatch and modulus interaction on the mobility of edge dislocations. For the selected alloys, unlike pure metals, the grain size was almost insensitive to the melting temperature, and like pure metals, no systematic correlation was established between the grain size and stacking fault energy (chemical interaction) or between the grain size and valence electrons (electrical interaction). The presence of a power-law relation, with n approximate to 0.56, between the hardness normalized by the shear modulus and grain size normalized by the Burgers vector signified the large contribution of grain boundaries to the hardening. The contribution of the solid-solution effect to the total hardening appeared to be