塑性变形对Zr-Al-Ni-Cu-Ag非晶合金中二十面体准晶相析出的影响

Influence of Rolling on the Precipitation of Icosahedral Quasicrystalline Phase in Zr-Al-Ni-Cu-Ag Amorphous Alloy

利用X射线衍射(XRD)和差示扫描量热法(DSC)研究了轧制对Zr65Al7.5Ni10Cu12.5Ag5非晶合金中二十面体准晶相析出的影响。实验发现,经轧制塑性变形合金在随后的加热过程中二十面体准晶相的析出量增加,在变形量ε=70%时达到最大。另外,析出的二十面体准晶相的稳定性随着变形量增大而提高,在ε=70%时达到最大,随后又开始降低。这是由于合金在塑性变形过程中的原子组态发生变化所致。

Influence of rolling on the precipitation of icosahedral quasicrystalline phase （I-phase） in Zr65A17.5Ni10Cu12.5Ag5 amorphous alloy is investigated by X-ray diffraction （XRD） and differential scanning calorimetry （DSC）. The results show that more I-phase precipitate in the roiled alloys than that in the as-cast one, and that the amount becomes the maximum when the deformation degree ε reaches 70 %. Furthermore, the thermal stability of the I-phase increases with the deformation degree increasing. The thermal stability of I-phase shows the maximum at ε=70 %, but subsequently decreases. It is attributed to the change of atomic configuration in the alloy during plastic deformation.