An extraordinary enhancement of strain hardening in fine-grained zirconium

详细信息    查看全文

• 作者：Defeng Guo ; Zhibo Zhang ; Guosheng Zhang ; Ming Li ; Yindong Shi ; Tengyun Ma ; Xiangyi Zhang
• 关键词：Strain hardening ; Microstructure ; Nanostructured materials ; Zirconium ; Cryorolling
• 刊名：Materials Science and Engineering: A
• 出版年：3 January, 2014
• 年：2014
• 卷：591
• 期：Complete
• 页码：167-172
• 全文大小：3702 K

文摘

Grain refinement always leads to a high strength but a low ductility that results from a reduced strain hardening. Here, we report an extraordinary enhancement of strain hardening in fine-grained (FG) Zr with an average grain size of 2-3 渭m compared with its coarse-grained (CG) counterpart, which yields a uniform elongation of ~15.5% in the same order as that (~13.2%) of the CG Zr. The unusually enhanced strain hardening in the FG Zr is attributed to the formation of nano-scale defect structures within the fine grains. The present work provides a promising way to enhance the ductility of fine- and ultrafine-grained materials without losing their high strength, and thus is of wide interest.