Nanocrystallization enabled tensile ductility of Co-based amorphous microwires

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• 作者：Huan Wang^a ; ^b ; Dawei Xing^a ; Huaxin Peng^b ; ^c ; Faxiang Qin^b ; Fuyang Cao^a ; Guoqiang Wang^a ; Jianfei Sun^a ; ^{jfsun_hit@263.net}
• 关键词：Amorphous wire ; Melt extraction ; Cold drawing ; Tensile ductility ; Microstructure evolution
• 刊名：Scripta Materialia
• 出版年：2012
• 期刊代码：157_13596462
• 类别：et
• 出版时间：June, 2012
• 卷：66
• 期：12
• 页码：1041-1044
• 文件大小：448 K

摘要

Melt-extracted amorphous Co_68.15Fe_4.35Si_12.25B_15.25 microwires were drawn at ambient temperature into different diameters and the dependence of tensile properties and microstructural evolution on the degree of deformation was investigated. The cold-drawn wire with 51%area cross-section reduction exhibits a tensile ductility of 1.64%, with a tensile strength exceeding 4000 MPa. Deformation-induced Co-rich nanocrystals were observed in the cold-drawn wires and proved to be capable of arresting the quick extension of shear bands and leading to the enhanced global plasticity of the microwires.