0386754 - ÚFM 2013 RIV GB eng J - Článek v odborném periodiku
Kruml, Tomáš - Martin, J. L.
Dislocation densities and internal stress in Ni3Al.
Philosophical Magazine. Roč. 93, 1-3 (2013), s. 50-59. ISSN 1478-6435. E-ISSN 1478-6443
Institucionální podpora: RVO:68081723
Klíčová slova: dislocation structure * ordered intermetallic * stress analysis * TEM
Kód oboru RIV: JG - Hutnictví, kovové materiály
Impakt faktor: 1.427, rok: 2013 ; AIS: 0.696, rok: 2013
DOI: https://doi.org/10.1080/14786435.2012.706371

Dislocation densities have been measured in Ni3Al(Hf) single crystals after deformation at various temperatures and strains. In addition, effective and athermal stresses have been determined by strain dip tests. A model is proposed for the strength anomaly domain which correlates the athermal part of the stress with the operation of dislocation sources, to compensate for the strong dislocation exhaustion. Dislocation density data, which evidence an anomaly in the density with temperature over the stress anomaly domain, are shown to support this model predictions between 373K and 683K for plastic strains larger than 3. 10 -2 but not at yield. In addition, the presence of Hf atoms (3.3 at. %) induces a friction stress close to 63 MPa.
Trvalý link: http://hdl.handle.net/11104/0216451