Effect of pre-existing shear bands on mechanical properties and serration behaviors in bulk metallic glasses
Effect of pre-existing shear bands on mechanical properties and serration behaviors in bulk metallic glasses作者机构：School of MechanicalElectrical &Information EngineeringShandong University(Weihai) School of ScienceNorthwestern Polytechnical University
出 版 物：《Journal of Iron and Steel Research International》 (国际钢铁研究杂志)
年 卷 期：2017年第24卷第4期
页 面：402-410页
核心收录：
学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）]
基 金：financially supported by the National Natural Science Foundation of China(51501104,51501103,and 51371108) the Young Scholars Program of Shandong University(Weihai)
主 题：Bulk metallic glass Shear band Serration Ductility Pre deformation
摘 要：Pre-existing（multiple）shear bands were introduced into the ductile Zr56Co28Al16 and Zr65Ni10Cu15Al10bulk metallic glasses（BMGs）through the lateral-deformation,*** was found that the pre-exiting shear bands can further enhance the compressive plasticity of ductile *** to the serration analysis on the plastic deformation of the as-cast and the pre-deformed samples,the serration events in the stress-strain curves during deformation display a self-organized critical（SOC）*** with the as-cast BMGs,a larger power-law scaling exponent calculated based on serrated flow behaviors becomes larger for the pre-deformed BMGs,implying that the shear banding stability of BMGs is effectively *** should be caused by the pronounced interactions of shear bands during plastic deformation for the pre-deformed ***,by introducing a large amount of multiple shear bands into the glassy matrix,it also becomes easier for shear bands to propagate along the pre-existing shear bands,leading to a lower cut-off elastic energy density for the pre-deformed *** multiple shear bands with stronger interactions for the pre-deformed BMGs could provide a larger chance to activate the shear-band cracking but less local elastic energies are remained for the subsequent crack-linking.
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