TIMETAL-18 Alloy

TIMETAL-18 Alloy

Alloy name: TIMETAL-18
Diagram No.: 873
Type of diagram: TTT
Chemical composition in weight %: 5.5% Al, 5% V, 5% Mo, 2.4% Cr, 0.75% Fe, 0.15% O, balance is Ti
Alloy group: Titanium-based alloys
Note: Time-Temperature-Transformation (TTT) diagram for Ti-18 alloy.
The first TTT diagram for the Ti-18 was obtained using these isothermal resistivity measurements performed on water quenched samples after quench and during heating. We reported the progress of the a precipitation reaction as a function of time, obtaining 3 values of progress at 10%, 50% and 95% respectively, at each temperature. For overlapping domains, the raw resistometric curves have been deconvoluted carefully, assuming superposition of different contributions related to each mechanism. This diagram illustrates two different mechanisms, each one characterized by a C-curve associated to different precipitation's kinetics according the temperature. The first nose, a high temperature nose near 700°C, is associated with the formation of Alpha(GB)+Alpha(WGB) and the second nose close to 600°C corresponds to the formation of Alpha(WI).
Reference: Not shown in this demo version.

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