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Insights into the soft brittle-to-ductile transition from discrete dislocation dynamics

Journal Article · · Computational Materials Science
 [1];  [2];  [3]
  1. Colorado State University, Fort Collins, CO (United States); Colorado State University
  2. University of Alabama, Tuscaloosa, AL (United States)
  3. Colorado State University, Fort Collins, CO (United States)

The Brittle-to-ductile transition (BDT) in body centered cubic metals exhibits a soft transition wherein the fracture toughness gradually rises to before the onset of ductility. The resultant brittle-to-ductile transition temperature can be described with an Arrhenius relationship whose activation energy is related to plasticity in the material. To provide further insight into the nature of the BDTT, in this work we utilized a discrete dislo- cation dynamics model with a crack to simulate the BDT and how it depends on the thermally activated nature of plasticity. The interrelationship between the BDT activation energy and the dislocation mobility parameters were determined via the calculation of first order sensitivity coefficients. This analysis allows us to demonstrate that the activation energy for the BDT is directly related to the activation energy for plasticity through an effective stress that defines this relationship. This effective stress physically is the average stress on the dislocations that move out of the crack. Lastly, we are able to show that this effective stress is dictated by the low temperature fracture toughness or cleave energy of the material and the source position, the latter of which can be affected by processing. Collectively, these results provide new insight into what controls the thermal activation of the BDT and what are the important parameters to control it.

Research Organization:
Colorado State University, Fort Collins, CO (United States); University of Alabama, Tuscaloosa, AL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0022061
OSTI ID:
2519729
Alternate ID(s):
OSTI ID: 2476732
Journal Information:
Computational Materials Science, Journal Name: Computational Materials Science Vol. 247; ISSN 0927-0256
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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