Developing dual-textured titanium (Ti) extrudates via utilizing the β transus in commercially pure Ti. (March 2022)

• Record Type: Journal Article
• Authors: Wan, J.; Chen, B.; Shen, J.; Shi, W.; Kondoh, K.; Li, S.; Li, J.S.
• Is Part Of: Materials & design. Volume 215(2022)
• Publication Date: 2022-03
• Subjects: CP-Ti -- Hot extrusion -- Dual-textured microstructure -- β transus; Materials -- Periodicals; Engineering design -- Periodicals; Matériaux -- Périodiques; Conception technique -- Périodiques; Electronic journals; 620.11
• DOI: 10.1016/j.matdes.2022.110459
• Languages: English
• ISSNs: 0264-1275

Abstract

Graphical abstract: Highlights: Developed dual-textured Ti extrudates via utilizing the β transus in CP-Ti. Revealed the <0001>//ED and <1011>//ED texture on the firstly extruded portion and <1010>//ED texture on the rest extrudate. Rationalized the formation mechanism of this novel dual-textured microstructure. Established the correlation between elemental inhomogeneity and mechanical property deviation along the Ti extrudates. Abstract: In contrast with titanium (Ti) alloys, the α+β region for commercially pure Ti is neglectable. Therefore, its β transus ( T β ) can be regarded as a watershed for β-Ti and α-Ti. Utilizing this characteristic, we fabricated dual-textured Ti extrudates through a powder metallurgy route via manipulating the hot extrusion temperature. The crystallographic texture along extrusion direction (ED) was analyzed. Different from the sole <1010>//ED texture throughout the entire extrudate in previous studies, our extrudates exhibited unique dual-textured microstructure. The firstly extruded portion manifested <0001>//ED and <1011>//ED, whereas the rest extrudate displayed <1010>//ED. This was attributed to the realtime extrusion temperature of each location in comparison with T β . On the other hand, the last portion of the extrudate contained much more interstitial nitrogen and oxygen, which led to extremely high strength via solid solution strengthening. This was resulted from a combination effect of diffusion-controlled element absorbing and material flow during extrusion. Our findings may open up a new direction in developing high-performance materials with variable microstructure and mechanical properties for medical applications like neoarthrosis.