Abstract
In-situ study of heating in an X-ray diffractometer of Ti-8Mo and Ti-3Al-7Mo alloys samples quenched from different temperatures of α+β and β-fields was carried out. The characteristics of anisotropy thermal expansion of orthorhombic martensite lattice were investigated. It is shown that there is a critical ratio of lattice parameters R = ⇃3a/b close to 1.11, after which either a reverse martensitic transformation occurs, or R of the martensite lattice decreases upon further heating.
Highlights
The Ti-Mo system is the basis for many industrial titanium alloys
Titanium alloys having a microstructure of orthorhombic martensite obtained either as by direct quenching from high temperatures and as a result of the strain-induced martensitic transformation, became the object of serious study [3]
This is associated with a number of features of the direct and the reverse martensitic transformation, such as the shape memory effect and the low modulus
Summary
The presence of Mo in the composition can significantly increase the mechanical properties of the material In this case, Mo is an isomorphous β-stabilizer and, according to the data [1], it is possible to produce martensite during the quenching from the β-region in the Mo concentration range up to 11.3% (wt.). Titanium alloys having a microstructure of orthorhombic martensite obtained either as by direct quenching from high temperatures and as a result of the strain-induced martensitic transformation, became the object of serious study [3]. This is associated with a number of features of the direct and the reverse martensitic transformation, such as the shape memory effect and the low modulus. This study expands the conception of A20 lattice on the example of Ti-Mo and TiAl-Mo alloy systems
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