Abstract
Titanium alloys are widely used in the aerospace and power generation industries due to their high specific strength and corrosion resistance. Titanium alloys like the modern (α +β) titanium alloy Ti-6Al-2Sn-4Zr-6Mo (Ti-6246) are difficult to machine due to the formation of long chips which hinders automated manufacturing. In the present study, lanthanum has been added to Ti-6246 alloy to improve its machinability, i.e., to reduce the chips’ length. As lanthanum and Tin form La5Sn3 intermetallic phase, the 2% of Tin had to be replaced by 3% of zirconium. The matrix of Ti-6Al-7Zr-6Mo with lanthanum contains pure metallic lanthanum precipitates which have a relatively low melting point compared to titanium. Besides the standard alloy Ti-6246 two modified alloys, namely, Ti-6Al-7Zr-6Mo-0.9La and Ti-6Al-7Zr-6Mo-0.5La were investigated. During machining of these new free-machining alloys, short and strongly segmented chips are observed enabling automation of machining operations. This can be explained by softening of lanthanum particles during segmented chip formation. The microstructure, phase composition, and deformability of the new free-machining alloys were analyzed after different thermomechanical treatments. In addition, the mechanical properties of the modified alloys are investigated which are similar compared to the standard alloy.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
