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  • 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.
  • 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. (en)
Title
  • Dislocation densities and internal stress in Ni3Al
  • Dislocation densities and internal stress in Ni3Al (en)
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  • Dislocation densities and internal stress in Ni3Al
  • Dislocation densities and internal stress in Ni3Al (en)
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  • RIV/68081723:_____/13:00386754!RIV13-AV0-68081723
http://linked.open...avai/riv/aktivita
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  • I
http://linked.open...iv/cisloPeriodika
  • 1-3
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  • 69892
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  • RIV/68081723:_____/13:00386754
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  • dislocation structure; ordered intermetallic; stress analysis; TEM (en)
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  • GB - Spojené království Velké Británie a Severního Irska
http://linked.open...ontrolniKodProRIV
  • [8032DD30AB0C]
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  • 93
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  • Kruml, Tomáš
  • Martin, J. L.
http://linked.open...ain/vavai/riv/wos
  • 000315719700005
issn
  • 1478-6435
number of pages
http://bibframe.org/vocab/doi
  • 10.1080/14786435.2012.706371
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