Development of ultrahigh strength and high ductility in nanostructured iron alloys with lattice softening and nanotwins

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• 作者：Kaveh Edalati ; Shoichi Toh ; Tadahiko Furuta ; Shigeru Kuramoto ; Masashi Watanabe ; Zenji Horita
• 关键词：High-pressure torsion (HPT) ; Martensite ; Nanostructure ; Ultrafine grain ; Twinning
• 刊名：Scripta Materialia
• 出版年：2012
• 出版时间：September, 2012
• 年：2012
• 卷：67
• 期：5
• 页码：511-514
• 全文大小：726 K

文摘

Bulk nanostructured materials exhibit high strength but very low ductility. In this study, ductile nanostructured iron-base alloys are successfully developed using a combination of three strategies: appropriate choice of chemical compositions for lattice softening, severe plastic deformation using high-pressure torsion for grain refinement, and annealing for nanotwin formation. Accordingly, exceptional performance of both ultrahigh strength, 2.3-3 GPa, and high elongation to failure, 10-20 % , which has never been reported for metallic materials, is achieved.