Non-linear deformation mechanisms during nanoindentation

✍ Scribed by D.F. Bahr; D.E. Kramer; W.W. Gerberich

• Book ID: 104403557
• Publisher: Elsevier Science
• Year: 1998
• Tongue: English
• Weight: 543 KB
• Volume: 46
• Category: Article
• ISSN: 1359-6454
• DOI: 10.1016/s1359-6454(98)00024-x

✦ Synopsis

AbstractÐExperiments involving the indentation of single crystals of both tungsten and an iron alloy show that the observed yield phenomena can be predicted using a superdislocation model driven by the change in shear stress between the elastically and fully plastic loading conditions. A low density of dislocation multiplication sites is required to support elastic loading which approaches applied shear stresses on the order of the theoretical shear strength of the material. Oxide ®lm thickness and crystal orientation are examined as parameters in controlling the yield phenomena. A model based on activation of dislocation multiplication sources is suggested to explain the initiation of the yield point during indentation and the overall load±depth relationship during indentation.