High strength and ductility in multimodal-structured Zr

被引：78

作者：

Guo, Defeng ^{[1
,2
]}

Li, Ming ^{[1
]}

Shi, Yindong ^{[1
]}

Zhang, Zhibo ^{[1
]}

Zhang, Haitian ^{[1
]}

Liu, Xiaoman ^{[1
,3
]}

Wei, Bingning ^{[1
]}

Zhang, Xiangyi ^{[1
]}

机构：

[1] Yanshan Univ, State Key Lab Metastable Mat Sci & Technol, Qinhuangdao 066004, Peoples R China

[2] Yanshan Univ, Coll Sci, Qinhuangdao 066004, Peoples R China

[3] Yanshan Univ, Coll Civil Engn & Mech, Qinhuangdao 066004, Peoples R China

来源：

MATERIALS & DESIGN | 2012年 / 34卷

基金：

中国国家自然科学基金;

关键词：

HIGH-TENSILE DUCTILITY; MECHANICAL-PROPERTIES; PLASTIC-FLOW; STRAIN-RATE; DEFORMATION; MICROSTRUCTURE; ZIRCONIUM; METALS; BULK; BEHAVIOR;

D O I：

10.1016/j.matdes.2011.08.002

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Metals can be strengthened by many methods, but theses strategies always result in limited ductilities. A simultaneous enhancement of strength and ductility in metals is still a great challenge. In the present study, a multimodal grain structure composed of coarse grains (similar to 24%), ultrafine grains (similar to 56%), and nanoscale grains or subgrains (similar to 20%) has been introduced in hcp pure Zr by employing cryorolling in the temperature range from -160 to -90 degrees C combined with subsequent low-temperature annealing. The multimodal structured Zr exhibits a high ultimate tensile strength (similar to 658 MPa) and a large uniform elongation (similar to 8.5%) simultaneously. The high strength results from the contribution of nanoscale and ultrafine grains, while the improved ductility is mainly derived from the improved strain hardening capability by the coarse grains that are effective in storing dislocations and complex deformation strain paths caused by the multimodal distribution of grain sizes. (C) 2011 Elsevier Ltd. All rights reserved.

引用

页码：275 / 278

页数：4

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