Consolidation of the Amorphous Zr50Cu50 Ribbons by High‐Pressure Torsion

Consolidation of the Amorphous Zr50Cu50 Ribbons by High‐Pressure Torsion
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高压扭转固结非晶 Zr50Cu50 带材

DOI:
10.1002/adem.201900694
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发表时间:
2019
影响因子:
3.6
通讯作者:
R. Valiev
R. Valiev
中科院分区:
材料科学3区
文献类型:
--
作者:
D. Gunderov;E. Boltynjuk;E. Ubyivovk;A. Churakova;A. Kilmametov;R. Valiev

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采用高压扭转来固结熔纺 Cu50Zr50 非晶带材。高压扭转加工是通过使用不同数量的砧座旋转来改变应变来进行的。光学显微镜 (OM) 和透射电子显微镜 (TEM)、X 射线衍射 (XRD) 用于研究加工方式对固结和结构变化的影响。初始非晶带表面上存在的氧化层阻碍带固结成完全致密的样品。在旋转一圈后变形的样本中心区域可以清楚地观察到单独的条带,而由于加工过程中沿半径的应变梯度,边缘区域看起来更加坚固。应变的增加(通过增加旋转次数)可以提高固结样品的均匀性。十次旋转的高压扭转处理导致形成致密的样品,在中心区域有少量集中的小裂纹状缺陷。显然,氧化物变得细化并主要以细颗粒的形式分布在基体中。表面氧化物也可能发生一定程度的溶解,并在非晶态金属基体中形成氧固溶体。
High‐pressure torsion is used to consolidate the melt‐spun Cu50Zr50amorphous ribbons. The high‐pressure torsion processing is conducted varying the strain using different numbers of anvil rotations. Optical microscopy (OM) and transmission electron microscopy (TEM), X‐ray diffraction (XRD) are used to study the effect of processing regimes on consolidation and structural changes. Oxide layers, which are present on the surface of the initial amorphous ribbons, hinder the consolidation of ribbons into fully dense samples. Individual ribbons are clearly observed in the central region of the specimen deformed for one rotation, whereas the edge regions look more consolidated due to the strain gradient along the radius during processing. An increase in strain (by increasing the number of rotations) improves the homogeneity of the consolidated samples. The high‐pressure torsion processing for ten rotations leads to the formation of dense samples with a minor concentration of small crack‐like defects in the central region. Apparently, the oxides become refined and are distributed in the matrix predominantly in the form of fine particles. Possibly, there is also some dissolution of surface oxides with the formation of a solid solution of oxygen in the amorphous metallic matrix.
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