Details

Autor(en) / Beteiligte

• Reddy, Vikranth Sagar
• Nath, Parswa
• Horbach, Jürgen
• Sollich, Peter
• Sengupta, Surajit

Titel

Nucleation Theory for Yielding of Nearly Defect-Free Crystals: Understanding Rate Dependent Yield Points

Ist Teil von

• Physical review letters, 2020-01, Vol.124 (2), p.025503-025503, Article 025503

Ort / Verlag

United States: American Physical Society

Erscheinungsjahr

2020

Link zum Volltext

Quelle

Free E-Journal (出版社公開部分のみ）

Beschreibungen/Notizen

• Experiments and simulations show that when an initially defect-free rigid crystal is subjected to deformation at a constant rate, irreversible plastic flow commences at the so-called yield point. The yield point is a weak function of the deformation rate, which is usually expressed as a power law with an extremely small nonuniversal exponent. We reanalyze a representative set of published data on nanometer sized, mostly defect-free Cu, Ni, and Au crystals in light of a recently proposed theory of yielding based on nucleation of stable stress-free regions inside the metastable rigid solid. The single relation derived here, which is not a power law, explains data covering 15 orders of magnitude in timescales.