Superelastic alloy Ti-22%Nb-6%Zr: X-ray study of deformation features

10th International School-Conference on Materials for Extreme Environment: Development, Production and Application

Perlovich, Yu^1 ; Isaenkova, M.^1 ; Chekanov, S.^1 ; Fesenko, V.^1 ; Krymskaya, O.^1

National Research Nuclear University MEPhI, Moscow Engineering Physics Institute, Kashirskoe highway, 31, Moscow

115409, Russia^1

关键词: Cross correlations;    Deformation feature;    Generalized pole figure;    Martensite transformations;    Microdeformations;    Orientation dependence;    Super-elastic alloys;    X-ray line broadening;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/130/1/012034/pdf
DOI  :  10.1088/1757-899X/130/1/012034

来源: IOP

【 摘 要 】

In this paper features of deformation of superelastic Ti-22%Nb-6%Zr alloy were studied. Using X-ray method of generalized pole figures for study orientation dependence of martensite transformation in superelastic Ti-22%Nb-6%Zr alloy it was shown that: under compression the strain hardening due β → α '' transformation is significantly greater in grains with rolling plane {100} than in grains with a rolling plane {111}; the lattice microdeformation at β - and α '' - phase grains under loading is redistributed so that it extremely assist the sample macrodeformation (most of all); most intense β → α '' transformation occurs in grains, where Δd / dav> 0, most prone to increasing of its lattice volume. Diagrams of the cross-correlation substructural parameters built on the basis of generalized pole figure indicate that in loaded sample the deviation of interplanar space from the weight average level promotes the activation of martensite transformation at which the X-ray line broadening is minimal.