>>1497964hmm i don't think you can affect the material properties that much. in general heat treatment and quenching is used.
or maybe change material? blank titanium rods seem to cheap
https://www.amazon.com/Titanium-Grade-Diameter-Length-Inches/dp/B07MT9HSHT/ref=lp_11260342011_1_5?s=industrial&ie=UTF8&qid=1555776096&sr=1-5