Effect of Rolling on Deformation-Induced Martensite Transformation in a Metastable β-ZrTiAlV Alloy

The influence of rolling reduction and temperatures at room and liquid nitrogen on the formation of deformation-induced martensite and microstructural evolution in a β-ZrTiAlV alloy was investigated by X-ray diffraction (XRD), optical microscopy (OM) and electron backscatter diffraction (EBSD) technique. The results indicate that a deformation-induced martensite phase transformation process from body-centered cubic β to closed-packed hexagonal α' accompanying with (1012) twinning in the α' phase simultaneously occurs. With the increase of rolling reduction, the deformation-induced phase transformation and the volume fraction of martensite variant increase. Nevertheless, lower temperature (liquid nitrogen) results in the inhibition of α' martensite transformation and the promotion of the (1012) twinning. When the specimen is subjected to the rolling reduction of 5%, plate-like deformation-induced martensite starts appearing in the equiaxed parent β grains. However, when the rolling reduction increases to 10%, the deformation-induced martensite would be generated fully within some β grains. © 2019, Science Press. All right reserved.