Critical microstructures and defects in heterostructured materials and their effects on mechanical properties

被引：219

作者：

Liu, Yanfang ^{[1
]}

Cao, Yang ^{[1
]}

Mao, Qingzhong ^{[1
]}

Zhou, Hao ^{[1
]}

Zhao, Yonghao ^{[1
]}

Jiang, Wei ^{[1
]}

Liu, Ying ^{[2
]}

Wang, Jing Tao ^{[2
,3
]}

You, Zesheng ^{[3
]}

Zhu, Yuntian ^{[1
,4
]}

机构：

[1] Nanjing Univ Sci & Technol, Nano & Heterogeneous Mat Ctr, Sch Mat Sci & Engn, Nanjing 210094, Peoples R China

[2] Nanjing Univ Sci & Technol, Sch Mat Sci & Engn, Nanjing 210094, Peoples R China

[3] Nanjing Univ Sci & Technol, Herbert Gleiter Inst Nanosci, Nanjing 210094, Peoples R China

[4] North Carolina State Univ, Dept Mat Sci & Engn, Raleigh, NC 27695 USA

来源：

ACTA MATERIALIA | 2020年 / 189卷

基金：

中国国家自然科学基金; 国家重点研发计划;

关键词：

Heterostructure; Hetero-deformation induced (HDI) hardening; Back-stress; Shear band; Slip band; STRAIN-GRADIENT PLASTICITY; ULTRAFINE-GRAINED METALS; HIGH-TENSILE DUCTILITY; DISLOCATION DENSITY; SHEAR BANDS; DEFORMATION; STRESS; EVOLUTION; STRENGTH; AL;

D O I：

10.1016/j.actamat.2020.03.001

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Systematic study was conducted on the microstructures and mechanical properties of nickel samples with two distinct types of heterostructures. The first is featured with coarse-grained lamellae embedded in a matrix consisting of a very high density of dislocation structures. The second is featured with coarse-grained zones embedded in the ultrafine-grained matrix. The second type of heterostructures exhibits better strength and ductility, although it has a smaller average grain size than the first type. The zone boundaries in the second type of heterostructures are less prone to cracking than those in the first type. Intersecting micro-shearbands formed net-like patterns in the second type of heterostructures during tensile deformation. This is the first ever observation of structural micro-shear-bands in a heterostructured material. It supports the claim that heterostructure promotes the formation of dispersive shear bands. In contrast, a macroscopic shear band formed and caused early failure of the sample with the first type of heterostructures. Our results indicate that well-developed ultrafine/nano grained matrix in heterostructured materials are necessary for preventing crack formation and shear band localization. This should be considered as a key factor for optimizing the mechanical properties of heterostructured materials. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：129 / 144

页数：16

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