Applicability of indentation tests to assess ductility in the hot rolling of aluminium alloys

Microstructural Evolution, Hardness, and Alligatoring in the Mushy State Rolled Cast Al-4.5Cu Alloy and In-Situ Al4.5Cu-5TiB2 Composite

“…It is intuitive that the probability of grain fragmentation (discussed further in Section III-D-2) increases at low liquid content, due to the high stress concentration inside grains. Duly et al [48] have examined the state of stress at the center and the edges of the surface and central plane of a hot-rolled plate, and their analysis has indicated that the planes of maximum shear stress are the probable planes of fracture. In addition, Tzimas and Zavaliangos [6] have shown evidence of shear band formation in the Al-4 wt pct Cu alloy compression tested in mushy state with a liquid volume fraction of 0.2 or less.…”

An examination of the accumulative roll-bonding process

“…In a study concerning the workability of aluminum alloys in the hot rolling process [9] the occurrence and the direction of edge cracking were identified to have occurred as a result of the state of stress at that location. The same approach indicates that at the center of the sample, the tensile stresses in the direction of rolling and the compressive stresses transverse to that direction cause the maximum shear stresses to occur in a direction of 45 • .…”

Characterisation of semi-solid material mechanical behaviour by indentation test

“…For these reasons, many authors have recently applied mixed numerical-experimental methods to determine the material and friction parameters [2][3][4][5][6][7][8][9]. In this paper, we propose to use also a mixed numerical-experimental method based on the indentation test [10][11][12] to study the rheology of semi-solid materials used in thixoforming. In the first part, the methodology is explained and applied to a model visco-plastic material to study the influence of the indenter geometry.…”