Forced shear deformation behaviors of annealed pure titanium under quasi-static and dynamic loading
发布时间：2022-06-10
点击次数：
DOI码：10.1016/j.msea.2022.142872
发表刊物：Materials Science and Engineering A
关键字：Pure titaniumForced shear deformationAdiabatic shear bandTwinningDynamic recrystallization
摘要：The mechanical behavior and microstructure characteristics of pure titanium with hat-shaped specimens compressed under quasi-static and dynamic loading were investigated. Results show that higher yield stress and peak stress are observed in dynamic specimen as compared to quasi-static specimen. Microstructure characterization reveals that a wide shear localization region is formed in quasi-static specimen, mainly composed of narrow elongated structures identified as resulting from the multiple generations of twins and subsequently subdivision and elongation along the shear direction, while an ASB is appeared in dynamic specimen, consisting of ultrafine equiaxed grains regarded as the result of rotational dynamic recrystallization of subgrains. The RDR mechanism is verified by thermodynamic and kinetic calculations. Three types of primary twins {1012}, {1122} and {1121} and multiple generations of twins are observed in both specimens. The proportion of {1121} extension twins increases significantly in dynamic specimen and {1011} contraction twins are detected within the ASB. The microhardness of shear localization region in quasi-static specimen and ASB in dynamic specimen is higher than that of other regions due to the strain hardening and ultrafine-grained strengthening, respectively. Microtexture analysis reveals that the strong microtexture induced by twinning that < 0001 > direction of the grains is -35 & nbsp; away from the local shear plane normal forms in the shear localization region of quasi-static specimen, while different microtexture that the < 1120 > direction and the {1010} plane of the grains parallel to the local shear direction and shear plane respectively, appears in the ASB of dynamic specimen.
合写作者：Z.Y. Chen*, R.K. Wang, C.M. Liu
第一作者：Z.C. Zhu
论文类型：期刊论文
文献类型：J
卷号：839
页面范围：142872
ISSN号：0921-5093
是否译文：否
发表时间：2022-04-06
收录刊物：SCI