When produce the titanium zirconium molybdenum (TZM) alloys, the last step generally required extrusion, forging or
pressing, so to improve shaping and processing performance. But TZM alloy after
extrusion, forging or pressing will produce residual stress.
In order to eliminate residual stress and change the brittleness of the alloy,
therefore need to do some annealing treatment. Because the Ti, Zr and C in TZM
alloy will cause carbide precipitation and Ti, Zr solid solution so that TZM
alloy recrystallization temperature will improve, and the annealing temperature
of TZM alloy is generally above 1150 ℃. On the other hand, select
the annealing temperature annealing is crucial. Because the annealing
temperature can affect not only impact the hardness, but also tensile
properties of the alloy can be greater.
Annealing is generally happen in a vacuum or protection of hydrogen, but after
some recent studies have found that nitrogen use as a protected gas during
annealing, that is making nitriding alloy to alloy during annealing. TZM alloy
after nitriding, the base body to produce titanium nitride particle and it can
improve the hardness and tensile strength of the alloy.
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