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

被引：191
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
收藏
页码：129 / 144
页数：16
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