Improvement of stretch formability of Mg–3Al–1Zn alloy sheet by high temperature rolling at finishing pass

Enhanced Room-Temperature Stretch Formability of Mg–0.2 mass%Ce Alloy Sheets Processed by Combination of High-Temperature Pre-Annealing and Warm Rolling

“…At first glance, it seems that the lower texture intensity and larger inclination angle of the basal pole of sheet A contributed to strain in the thickness direction, resulting in enhanced room-temperature formability. On the other hand, our previous studies suggested that a reduction in basal texture intensity of 23 is essential for significant enhancement of the room-temperature formability of Mg alloys [MgMn alloys 11) and AZ31 alloys 13) ]. The above information implies that in addition to the variation in basal texture, an additional microstructural factor was likely to have affected the room-temperature formability in the case of MgCe alloy sheets.…”

Modeling Twin Clustering and Strain Localization in Hexagonal Close-Packed Metals

“…This is mainly attributed to the very strong basal textures that normally develop in Mg during most industrial rolling procedures [3][4][5] and the low number of easily activated slip systems at room temperature. [6][7][8][9][10][11][12] Plastic deformation in the thickness direction of such strong textured sheets would require the activation of hc+ai slip; however, the critical resolved shear stress (CRSS) values for such slip modes are relatively high at room temperature. A lot of recent work has been focused on designing alloys or rolling techniques that produce weaker textures to improve stretch formability.…”

“…A lot of recent work has been focused on designing alloys or rolling techniques that produce weaker textures to improve stretch formability. [3][4][5][6][7][8][9][10][11][12] However, the mechanisms by which strong textured magnesium sheets fail are not very well understood. Also the exact role of the various slip modes that may affect formability, i.e., an explanation of the considerable difference between the stretch formabilities of various hcp metals is not known.…”

Elastic and Damping Properties of AZ31 Magnesium Alloy Sheet Processed by High-Temperature Rolling

“…The significant reduction of basal texture intensity and the wide spread of the basal pole toward the RD and TD in the specimen rolled at 798 K are likely ascribed to the occurrence of discontinuous static recrystallization during annealing. 6,12) Tensile properties including ultimate tensile strength (UTS), 0.2% proof stress (YS), fracture elongation (FE), uniform elongation (UE), r-value and strain hardening exponent value (n-value) of the rolled specimens are summarized in Table 1. The YS and r-value increased with increasing the angle between the RD and the tensile direction, while the n-value showed a converse behavior.…”

“…[1][2][3][4][5][6][7][8][9][10][11][12] One method for enhancement of room temperature formability of magnesium alloy sheets is the use of improved rolling technologies such as shear rolling [1][2][3][4][5][6][7] and hightemperature rolling. 3,4,6,[9][10][11][12] High-temperature rolling is suggested to be one of the attractive rolling technologies, because a conventional rolling machine is directly available, if rolling temperature can be set to more than 723 K. The magnesium alloy sheet processed by the high-temperature rolling exhibits a significant weak basal texture, resulting in the excellent room temperature formability comparable to those of aluminum alloy sheets.…”