Details

Autor(en) / Beteiligte

• Fan, Yue
• Osetsky, Yuri N
• Yip, Sidney
• Yildiz, Bilge

Titel

Onset mechanism of strain-rate-induced flow stress upturn

Ist Teil von

• Physical review letters, 2012-09, Vol.109 (13), p.135503-135503, Article 135503

Ort / Verlag

United States: American Physical Society

Erscheinungsjahr

2012

Quelle

PROLA

Beschreibungen/Notizen

• The strain-rate response of flow stress in a plastically deforming crystal is formulated through a stress-sensitive dislocation mobility model that can be evaluated by atomistic simulation. For the flow stress of a model crystal of bcc Fe containing a 1/2[111] screw dislocation, this approach describes naturally a non-Arrhenius upturn at high strain rate, an experimentally established transitional behavior for which the underlying mechanism has not been clarified. Implications of our findings regarding the previous explanations of strain-rate effects on flow stress are discussed.