Nanocrystalline coating enhanced ductility in a Zr-based bulk metallic glass

被引：4
|
作者：
Li H. [1 ]
Li L. [1 ]
Fan C. [1 ]
Choo H. [1 ]
Liaw P.K. [1 ]
机构：
[1] Department of Materials Science and Engineering, University of Tennessee, Knoxville
来源：
Journal of Materials Research | 2007年 / 22卷 / 02期
基金：
美国国家科学基金会;
关键词：
Compressive stress - Ductility - Elastic moduli - Fracture toughness - Morphology - Nanocrystalline materials - Plastic deformation - Shear bands - Strength of materials - Zirconium alloys;
D O I：
10.1557/jmr.2007.0060
中图分类号：
学科分类号：
摘要：
Compression tests were conducted on the as-cast Zr58Ni13.6Cu18Al10.4 metallic glass at room temperature. The effect of nanocrystalline Ni-15%Fe coating (mean grain size: ∼10 nm) on mechanical properties was investigated. The results demonstrate that the strength, elastic limit, Young's modulus, and fracture geometry and morphology are not affected by this nanostructured coating. However, the compressive plastic strain increased noticeably when the specimens were coated with a layer of nanocrystal, which is attributed to the increased shear band density. The high shear band density is suggested to be due to the inhibition of shear band operation by nanocrystalline coating. The significance of this study is that a new strategy was developed to improve the ductility of bulk metallic glasses. © 2007 Materials Research Society.
引用
收藏
页码：508 / 513
页数：5
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