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Influence of Twinning Texture on the Corrosion Fatigue Behavior of Extruded Magnesium Alloys

Acta Metallurgica Sinica(English Letters) 2021年第1期34卷 65-76页

作者： Jiaqi Hu Qite Li Hong Gao School of Chemical Engineering and Technology Tianjin UniversityTianjin 300072China

Bio-magnesium alloys have received great attention due to their degradability and *** fatigue failure is a huge challenge in vivo for bio-magnesium alloy *** the eff ects of twinning textures on the corrosion fatigue of magnesium alloys is meaningful for the *** the current study,pre-compression strains of 2%and 4%were carried out on extruded *** effects of twinning texture on the corrosion performance and corrosion fatigue resistance were *** hydrogen evolution tests indicated that twinning texture enhanced the corrosion resistance of longitudinal cross section by improving uniformity of surface *** results of corrosion fatigue tests indicated that the differences in mechanical damage caused by twinning texture dominated the corrosion fatigue behavior under high stress *** secondary cracks of surface deteriorated the corrosion fatigue resistance of the original specimens under low stress *** compact corrosion film and the re-passivation of matrix suppressed the hydrogen induced cracking,thereby improving the corrosion fatigue resistance of the pre-compression specimens.

关键词： Magnesium alloy Corrosion fatigue Extension twins secondary crack

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Unveiling the underlying mechanism of forming edge cracks upon high strain-rate rolling of magnesium alloy

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Journal of Materials Science & Technology 2020年第15期47卷 59-65页

作者： Biwu Zhu Xiao Liu Chao Xie Jing Su Pengcheng Guo Changping Tang Wenhui Liu Key Laboratory of High Temperature Wear Resistant Materials Preparation Technology of Hunan Province Hunan University of Science and TechnologyXiangtan 411201China Faculty of Mechanical Engineering and Mechanics Ningbo UniversityNingbo 315211China Max-Planck-Institut für Eisenforschung GmbH Max-Planck-Strafie 1Dusseldorf40237Germany College of Mechanical and Electrical Engineering Central South University of Forestry and TechnologyChangsha 410004China Key Laboratory of High Temperature Wear Resistant Materials Preparation Technology of Hunan Province Hunan University of Science and TechnologyXiangtan 477207China

In the current study,high strain-rate rolling(≥10 s-1) has been successfully employed to produce Mg-3 A1-1 Zn alloy sheets to a high reduction of 82% with a fine grain structure in a single *** underlying mechanism of forming primary and secondary edge cracks has been *** is found that dynamic recrystallization(DRX) induced by subgrains tends to blunt cracks,while twinning-induced D RX is mainly observed around sharp crack *** motion of emitted dislocations from blunted cracks is inhibited by the DRX grain ***,on one hand,increases local work hardening,and on the other hand,causes stress concentration alo ng grain boundaries especially in the triple junctions leading to the formation of secondary cracks.

关键词： Edge crack secondary crack High strain-rate rolling AZ31 magnesium alloy Dynamic recrystallization

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CYCLIC DEFORMATION OF COARSE GRAINED POLYCRYSTALLINE PURE Al——Ⅱ.FRACTURE SURFACE MORPHOLOGY

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Acta Metallurgica Sinica(English Letters) 1992年第5期5卷 330-335页

作者： XIA Yuebo WANG Zhongguang State Key Laboratory for Fatigue and Failure of Materials,Institute of Metal Research,Academia Sinica,Shenyang,China

SEM photos for very coarse grained and high ductile polycrystalline pure Al show following characteristics:A few fracture sources are concentrated,the crack propagates in fan-shape near them,and the fatigue striations are cyclic cleavage *** striation consists of a wide cleavage facet and a narrow cleavage *** stages often blunt due to plastic *** fatigue striations are clear and continual,and distribute over whole zone of stage Ⅱ crack *** kinds of fatigue striations form in different levels,are conjoined by a“twisted baked piece of pastry”*** secondary crack along the fatigue striations was observed *** of them have already developed into secondary macrocracks and secondary fatigue striations were found clearly on secondary fracture sur- *** fracture surface can be divided into two parts,initiation and propagation zone of the crack,however,no statical-fracture zone was *** mechanism to form striations was preliminarily discussed.

关键词： fatigue crack Al fatigue striation secondary crack cleavage tongue

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