Texture-controlled anisotropic strength and ductility in hot-rolled Mg-2Zn-0.1Ca alloy

Area of Science:

• Materials Science
• Mechanical Engineering
• Metallurgy

Background:

• Hot-rolled magnesium alloys are crucial for lightweight applications.
• Understanding texture's role in mechanical behavior is vital for alloy design.
• Mg-2Zn-0.1Ca alloy offers a promising combination of properties.

Purpose of the Study:

• To systematically investigate the influence of crystallographic texture on the mechanical properties of a hot-rolled Mg-2Zn-0.1Ca alloy.
• To correlate deformation mechanisms with tensile loading direction (rolling vs. transverse).
• To elucidate the combined effects of texture and grain size on strength and ductility.

Main Methods:

• Tensile testing along rolling direction (RD) and transverse direction (TD).
• Slip-trace analysis to identify active deformation modes (basal vs. non-basal slip).
• Application of a modified Hall-Petch relationship to analyze texture and grain size effects.

Main Results:

• Loading along RD resulted in superior strength and ductility compared to TD.
• TD specimens predominantly exhibited basal slip, while RD specimens showed significant non-basal slip activation.
• A modified Hall-Petch analysis indicated that finer grains and a texture favoring reduced basal slip contribute to strength enhancement.

Conclusions:

• Crystallographic texture plays a critical role in the mechanical anisotropy of Mg-2Zn-0.1Ca alloy.
• Enhanced work hardening and deformation compatibility, driven by texture and grain size, lead to improved ductility by delaying crack initiation.