Influence of stacking fault energy on the minimum grain size achieved in severe plastic deformation

✍ Scribed by Y.H. Zhao; Y.T. Zhu; X.Z. Liao; Zenji Horita; Terence G. Langdon

• Publisher: Elsevier Science
• Year: 2007
• Tongue: English
• Weight: 731 KB
• Volume: 463
• Category: Article
• ISSN: 0921-5093
• DOI: 10.1016/j.msea.2006.08.119

✦ Synopsis

Samples of pure Cu and a Cu-10% Zn alloy were processed by high-pressure torsion and by high-pressure torsion followed by cold-rolling to a reduction of ∼75%. The grain sizes in these two conditions were measured by transmission electron microscopy and by X-ray diffraction. The experimental results show the average grain size and the width of the grain size distribution are both smaller in the Cu-10% Zn alloy by comparison with pure Cu. This difference is due to the lower stacking fault energy of the Cu-10% Zn alloy. An analysis shows all of the experimental results are consistent with a theoretical model predicting the minimum grain size produced by milling.