High strength and high ductility copper matrix composite reinforced by graded distribution of carbon nanotubes

被引：30

作者：

Chen, Lu ^{[1
]}

Hou, Zecheng ^{[1
]}

Liu, Yuanfeng ^{[1
]}

Luan, Chen ^{[1
]}

Zhu, Lin ^{[2
]}

Li, Wenzhen ^{[1
,2
,3
]}

机构：

[1] Tsinghua Univ, Sch Mat Sci & Engn, Beijing 100084, Peoples R China

[2] Tsinghua Univ, Tsinghua Foxconn Nanotechnol Res Ctr, Beijing 100084, Peoples R China

[3] Tsinghua Univ, Key Lab Adv Mat Proc Technol, Minist Educ, Beijing 100084, Peoples R China

来源：

COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING | 2020年 / 138卷

关键词：

Metal-matrix composites (MMCs); Carbon nanotubes and nanofibers; Mechanical properties; Plastic deformation; STRAIN-GRADIENT-PLASTICITY; MECHANICAL-PROPERTIES; BACK STRESS; DEFORMATION; MARTENSITE; STEEL;

D O I：

10.1016/j.compositesa.2020.106063

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The mutual exclusion between strength and ductility has been a long-standing problem in the field of materials science, especially in metal matrix composites (MMCs). Here we report the discovery of an unprecedented combination of high strength and high ductility within the copper matrix composites reinforced by super-aligned carbon nanotube (SACNT) films distributed with a gradient. The high strength (302 MPa) and high ductility (11.5%) are simultaneously achieved in this gradient-structured MMCs. The SACNT volume fraction gradient induces a plastic strain gradient and subsequent development of geometrically necessary dislocations (GNDs) near the boundaries. High back stress and extra strain hardening derived from the pile-up of GNDs are responsible for the superior mechanical properties. These observations shed light on the development of strong and ductile MMCs by architecting gradient structures.

引用

页数：7

共 42 条

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