Characterization of deformation anisotropies in an α-Ti alloy by nanoindentation and electron microscopy

摘要: Abstract The crystallographic dependence of the mechanical responses an α-Ti–7 wt.% Al alloy was measured by nanoindentation using spherical and Berkovich indenters. Both elastic moduli hardness indents on (0 0 0 1), ( 1 ¯ 0 ) 2 planes were quantified. dislocation structures resulting from indentation characterized electron microscopy. While scanning microscopy techniques used for observation surface slip structures, site-specific focused-ion-beam thin foil preparation transmission employed imaging sub-surface structures. Elastic modulus, load at pop-in found to vary with orientation. Indentation-induced plasticity occur multiple slip/twin mechanisms be dependent crystal orientation, although 〈a〉 (0 0 0 1) common all orientations. observed are rationalized basis theoretical predictions based anisotropic contact analysis resolved shear stress calculations.