Effect of germanium and silicon additions on the mechanical properties of a near-α titanium alloy

The effect of Germanium (Ge) addition and simultaneous addition of Ge and Silicon (Si) on the tensile properties, impact toughness, and fracture behavior of the near-α alloy Ti–5Al–2Sn–4Zr–2Mo has been investigated at room temperature and at 650°C. Addition of Ge monotonically increases the 0.2% yie...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2014-03, Vol.597, p.212-218
Main Authors: Kitashima, T., Suresh, K.S., Yamabe-Mitarai, Y.
Format: Article
Language:English
Subjects:
Applied sciences
Constant-composition solid-solid phase transformations: polymorphic, massive, and order-disorder
Cross-disciplinary physics: materials science
rheology
Elasticity. Plasticity
Exact sciences and technology
Fracture mechanics
Fractures
Germanium
Impact strength
Materials science
Mechanical properties
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Mechanical property
Metals. Metallurgy
Phase diagrams and microstructures developed by solidification and solid-solid phase transformations
Phase transformation
Physics
Precipitates
Precipitation
Silicon
Solid solution, precipitation, and dispersion hardening
aging
Titanium alloys
Titanium base alloys
Treatment of materials and its effects on microstructure and properties
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Summary:The effect of Germanium (Ge) addition and simultaneous addition of Ge and Silicon (Si) on the tensile properties, impact toughness, and fracture behavior of the near-α alloy Ti–5Al–2Sn–4Zr–2Mo has been investigated at room temperature and at 650°C. Addition of Ge monotonically increases the 0.2% yield stress (YS) and ultimate tensile stress (UTS) at both temperatures, and increases the rupture elongation at 650°C; however, the Charpy impact toughness at both temperatures decreased. At 650°C, this alloy ruptured in a hybrid manner, showing cracking at the germanide precipitates and plastic deformation in the surrounding matrix forming equiaxed dimples. The effect of simultaneous addition of 1wt% Ge and 0.1wt% Si on the mechanical properties is also discussed in relation to the effect of precipitate volume fraction and solid solution strengthening.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2013.12.099