Formation of a metastable fcc phase and high Mg solubility in the Ti-Mg system by mechanical alloying
Formation of a metastable fcc phase and high Mg solubility in the Ti-Mg system by mechanical alloying
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DOI：
10.1016/j.powtec.2020.07.053
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发表时间：
2020-09
影响因子：
5.2
通讯作者：
A. Tejeda-Ochoa;N. Kametani;C. Carreño-Gallardo;J. E. Ledezma-Sillas;N. Adachi;Y. Todaka;J. Herrera-Ramirez
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文献类型：
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作者：
A. Tejeda-Ochoa;N. Kametani;C. Carreño-Gallardo;J. E. Ledezma-Sillas;N. Adachi;Y. Todaka;J. Herrera-Ramirez
通过机械合金化处理钛和镁元素粉末，合成标称的 TixMg(100−x)(x= 100、75、50、25 和 0 at.%) 成分。结果，成功地扩展了固溶度，并获得了具有亚稳态面心立方相的纳米结构材料。该相的晶格参数随着Mg含量的增加而增加。纯 Ti 显示 Ti (fcc) 和 Ti (hcp) 相共存。 Ti75Mg25和Ti50Mg50组合物显示出向fcc相的完全相变，而Ti25Mg75组合物呈现Ti-Mg(fcc)相和Mg(hcp)相的共存。亚稳态面心立方相的形成是由于球磨过程中严重塑性变形引起的部分位错积累。
Titanium and magnesium elemental powders were processed by mechanical alloying to synthesize the nominalTixMg(100−x)(x= 100, 75, 50, 25 and 0 at.%) compositions. As a result, the solid solubility was successfully extended and nanostructured materials with a metastable fcc phase were obtained. The lattice parameter of this phase increased with the increment in the Mg content. Pure Ti showed the coexistence of the Ti (fcc) and Ti (hcp) phases. TheTi75Mg25andTi50Mg50compositions revealed a complete phase transformation to the fcc phase, while theTi25Mg75composition presented a coexistence of Ti-Mg (fcc) and Mg (hcp) phases. The metastable fcc phase was formed owing to the partial dislocation accumulation caused by the heavy plastic deformation during the ball milling process.