Reply to comments on ``The brittle-to-ductile transition. 1: A cooperative dislocation generation instability; 2: Dislocation dynamics and the strain rate dependence of the transition temperature``
- Univ. of Pennsylvania, Philadelphia, PA (United States). Dept. of Materials Science and Engineering
Recently, Hirsch and Roberts (HR) have commented on the model for the brittle-to-ductile transition (BDT) and its strain-rate dependence which was proposed by Khantha, Pope and Vitek (KPV) and Khantha (MK), respectively. HR conclude that the KPV-MK model predicts either a strain-rate independent sharp transition or a strain-rate dependent gradual transition for the case of silicon. Previously, the sharp strain-rate dependent BDT in Si, was modeled by Hirsch et al. using a `Dynamic Simulation Model` (DSM) for interacting dislocations with homogeneous distribution of dislocation sources along the crack front. Hirsch et al. also examined separately the effect of heterogeneous sources along the crack front. HR maintain that a strain-rate dependent sharp transition can be obtained only by using a heterogeneous source model and not using the KPV-MK and DSM models based on homogeneous sources. In this paper, the authors begin with a brief summary of the KPV-MK and DSM models, then address the specific issues raised in HR and demonstrate that their conclusions regarding the KPV-MK model are not warranted.
- OSTI ID:
- 276184
- Journal Information:
- Scripta Materialia, Journal Name: Scripta Materialia Journal Issue: 2 Vol. 35; ISSN 1359-6462; ISSN XZ503X
- Country of Publication:
- United States
- Language:
- English
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