Optimum rolling ratio for obtaining {001} recrystallization texture in Ti-Nb-Al biomedical shape memory alloy

Area of Science:

• Materials Science
• Metallurgy
• Crystallography

Background:

• The β-titanium alloy Ti-26Nb-3Al is a promising material for shape memory applications.
• Recrystallization texture significantly influences the mechanical properties of metallic alloys.
• The {001}<110> orientation is a desirable recrystallization texture for β-titanium shape memory alloys.

Purpose of the Study:

• To investigate the effect of rolling rate (r) on texture formation in Ti-26Nb-3Al alloy.
• To determine the optimal conditions for achieving the {001}<110> recrystallization texture.
• To understand the detrimental effects of the {112}<110> texture on mechanical properties.

Main Methods:

• Cold rolling of Ti-26Nb-3Al alloy at various rolling rates (r).
• Texture analysis of rolled and recrystallized samples.
• Correlation of rolling conditions with resulting crystallographic orientations.

Main Results:

• A rolling rate (r) of 90% resulted in a dominant {001}<110> cold-rolling texture.
• This {001}<110> texture was successfully transferred to the recrystallization texture without forming {112}<110>.
• Higher rolling rates led to the formation of the detrimental {112}<110> texture in both rolling and recrystallization.

Conclusions:

• The rolling rate (r) must be carefully controlled to achieve the desired {001}<110> recrystallization texture.
• Avoiding higher rolling rates prevents the formation of the {112}<110> texture, which compromises isotropic mechanical properties.
• Optimizing rolling conditions is key to harnessing the full potential of Ti-26Nb-3Al for shape memory applications.