Influence of HPT and Accumulative High-Pressure Torsion on the Structure and Hv of a Zirconium Alloy

The authors previously used the accumulative high-pressure torsion (ACC HPT) method for first time on steel 316, β-Ti alloy, and bulk metallic glass vit105. On low-alloyed alloys, in particular, zirconium alloy Zr-1%Nb, new was not used. This has a tendency to α → ω phase transformations at using simple HPT. When ACC HPT, transformation can be influenced greater extent. article studies sliding effect accumulation of shear strain Zr-1%Nb various stages (HPT). degree deformation different HPT estimated. influence conditions micro-hardness composition by X-ray diffraction (XRD) analyzed. It is shown that revolutions n = 2, anvils specimen significantly slip, which result material strengthening. found despite sliding, regular resulted high strengthening (micro-hardness more than doubled), after 10, up 97% ω-phase formed it (as papers other researchers). Accumulative leads strongest structure Hv and, therefore, higher real due upsetting cycles.