Abstract
In order to develop new magnesium alloy sheets with high formability at room temperature, the microstructure, texture, ductility, and stretch formability of rolled Mg–2%Gd–1%Zn and Mg–3%Gd–1%Zn sheets were investigated. The microstructures of these rolled sheets consist of fine recrystallized grains with a large amount of homogeneously distributed tiny particles in the matrix. The basal plane texture intensity is quite low and the basal pole is tilted by about 30° from the normal direction toward both the rolling direction and the transverse direction. The sheets exhibit an excellent ultimate elongation of ∼50% and a uniform elongation greater than 30%, and the Erichsen values reach ∼8 at room temperature. The flow curves of the two Mg–Gd–Zn alloys sheets display a remarkable linear hardening after an obvious yield point. The majority of the grains in the tilted texture have an orientation favorable for both basal slip and tensile twinning because of a high Schmid factor. The excellent stretch formability at room temperature can be attributed to the non-basal texture and low texture intensity, which led to the following characteristics: a lower 0.2% proof stress, a larger uniform elongation, a smaller Lankford value and a larger strain hardening exponent.
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