Effects of annealing temperature on microstructure and mechanical properties of Ti-2Mn-2Sn-0.1B alloy by powder metallurgy
Powder metallurgy process has significant advantages in production cost,freedom of composition design and so on,and is an effective way to manufacture low-cost and high-performance titanium alloys.In this paper,Ti-2Mn-2Sn-0.1B alloys were prepared by powder metallurgy,and the effects of annealing temperature on microstructure and mechanical properties of the alloy were studied.The results show that all of the Ti-2Mn-2Sn-0.1B alloys are composed of α,β,and TiB phases.Compared with the unannealed alloy,the β phase content in the alloy annealed at 750 ℃ increases,the flake and needle α'phases are deposited in the alloy annealed at 850 ℃,and the α and β phases are distributed in layers in the alloy annealed at 950 ℃.All the alloys are mainly ductile fracture,and the alloy annealed at 950 ℃ has better mechanical properties,the layered α and β phase can provide good strengthening and hardening effects,and the microhardness(HV),ultimate tensile strength,and elongation are 335±16,(803±4)MPa,and(11.3±2.2)％,respectively.
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