Interface affected zone for optimal strength and ductility in heterogeneous laminate

Huang, Chongxiang; Wang, Y.F.; Ma, Xiaolong; Yin, Sheng; Höppel, Heinz Werner; Wu, Xiaolei; Gao, Hongsheng; Zhu, Yuntian

doi:10.1016/j.mattod.2018.03.006

Cited by 453 publications

(113 citation statements)

References 42 publications

Supporting

Mentioning

108

Contrasting

Order By: Relevance

“…It is not clear how they interact with each other to produce the HDI hardening and HDI stress. Recently, it has been observed that local shear bands are formed across domain boundaries [62]. This might be caused by local interactions between local back stresses and forward stresses.…”

Section: Outstanding Issuesmentioning

confidence: 99%

Perspective on hetero-deformation induced (HDI) hardening and back stress

Zhu

2019

Materials Research Letters

863

135

View full text Add to dashboard Cite

Heterostructured materials have been reported as a new class of materials with superior mechanical properties, which was attributed to the development of back stress. There are numerous reports on back stress theories and measurements with no consensus. Back stress is developed in soft domains to offset the applied stress, making them appear stronger, while forward stress is developed to make hard domains appear weaker. The extra hardening in heterostructured materials is resulted from interactions between back stresses and forward stresses, and should be described as hetero-deformation induced (HDI) hardening and the measured 'back stress' should be renamed HDI stress. IMPACT STATEMENT The 'back stress' hardening in the literature can be described more accurately as hetero-deformation induced (HDI) hardening and the measured 'back stress' should be renamed HDI stress.

show abstract

Section: Outstanding Issuesmentioning

confidence: 99%

Perspective on hetero-deformation induced (HDI) hardening and back stress

Zhu

2019

Materials Research Letters

863

135

View full text Add to dashboard Cite

show abstract

“…According to the above-mentioned strategies for inducing high back-stress, the heterogeneous lamella structure (HLS) presents a near-ideal heterogeneous structure due to both the high density of domain interfaces and the adjustable volume fractions for soft/hard domains in such microstructure [16,23]. Our recent results have shown that a commercially-pure Ti with HLS, which possesses the spatial distribution of the alternating hard and soft lamellae with their both widths Recent studies on copper/bronze laminates by Huang et al have revealed possible existence of an optimum layer thickness for the best mechanical properties [25,155]. In-situ microstructural examinations during tensile deformation revealed pile up of high-density GNDs at the hetero-interfaces.…”

Section: Heterogeneous Lamella Structuresmentioning

confidence: 71%

“…While too small spacing would cause the overlapping of the distributions of GNDs for neighboring interfaces, resulting in decreasing strain hardening and tensile ductility. Thus, a proper spacing between the hetero-interfaces has been identified to be about 15 µm for generating the best tensile properties for the copper/bronze laminates [25].…”

Section: Heterogeneous Lamella Structuresmentioning

confidence: 99%

“…In fact, the superior mechanical properties of heterogeneous grain/lamella/phase structures can be attributed to the synergistic strengthening and strain hardening due to the mechanical incompatibility at the hetero-interfaces between adjacent soft/hard domains during plastic deformation [16,25]. Upon tensile loading, both the soft and hard domains are elastically deformed firstly, and after that, the soft domains yield first with increasing applied strain while the hard domains still deform elastically, which can create a strain gradient accommodated by GND pile-up at the hetero-interfaces [121,128].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A Review on Heterogeneous Nanostructures: A Strategy for Superior Mechanical Properties in Metals

Yang

Yuan

et al. 2019

Metals

View full text Add to dashboard Cite

Generally, strength and ductility are mutually exclusive in homogeneous metals. Nanostructured metals can have much higher strength when compared to their coarse-grained counterparts, while simple microstructure refinement to nanoscale generally results in poor strain hardening and limited ductility. In recent years, heterogeneous nanostructures in metals have been proven to be a new strategy to achieve unprecedented mechanical properties that are not accessible to their homogeneous counterparts. Here, we review recent advances in overcoming this strength–ductility trade-off by the designs of several heterogeneous nanostructures in metals: heterogeneous grain/lamellar/phase structures, gradient structure, nanotwinned structure and structure with nanoprecipitates. These structural heterogeneities can induce stress/strain partitioning between domains with dramatically different strengths, strain gradients and geometrically necessary dislocations near domain interfaces, and back-stress strengthening/hardening for high strength and large ductility. This review also provides the guideline for optimizing the mechanical properties in heterogeneous nanostructures by highlighting future challenges and opportunities.

show abstract

“…In other words, higher flow stress is needed to overcome this field to sustain further plastic deformation. Several studies have reported that high back stress induces strengthening and hardening in heterogeneous-structured materials [8,[33][34][35][36]. To measure the back stress generated during tensile deformation, LUR tests were performed on the GS (PT90, PT180, PT360) and coarse-grained samples.…”

Section: Back Stress Induced Strengthening and Hardeningmentioning

confidence: 99%

Outstanding Tensile Properties and Their Origins in Twinning-Induced Plasticity (TWIP) Steels with Gradient Substructures

et al. 2020

View full text Add to dashboard Cite

The low yield strength (~300 MPa) of twinning-induced plasticity (TWIP) steels greatly limits their structural applications in the industrial field. Conventional strengthening mechanisms usually cause an enhancement of yield strength but also a severe loss of ductility. In this research, gradient substructures were introduced in the Fe-22Mn-0.6C TWIP steels by different pre-torsional deformation in order to overcome the above limitations. The substructure evolution, mechanical properties, and their origins in gradient-substructured (GS) TWIP steels were measured and compared by electron backscattered diffraction (EBSD), monotonous and loading-unloading-reloading (LUR) tensile tests. It was found that a simple torsional treatment could prepare gradient twins and dislocations in coarse-grained TWIP steel samples depending on torsional strain. The uniaxial tensile tests indicated that a superior combination of high yield strength, high ultimate strength, and considerable ductility was simultaneously obtained in the GS samples. The high yield strength and high ultimate tensile strength were attributed to synergetic strengthening mechanisms, viz., dislocation strengthening, due to the accumulation of high density of dislocations, and very high back stress strengthening due to gradient substructure distribution, which was accommodated through pile-ups of extra geometrically necessary dislocations (GNDs) across the sample-scale. Additionally, high ductility originated from gradient substructure-induced back stress hardening. The present study is also beneficial to the design efforts of high strength and high ductility of other heterogeneous-structured TWIP alloy systems.

show abstract

Interface affected zone for optimal strength and ductility in heterogeneous laminate

Cited by 453 publications

References 42 publications

Perspective on hetero-deformation induced (HDI) hardening and back stress

Perspective on hetero-deformation induced (HDI) hardening and back stress

A Review on Heterogeneous Nanostructures: A Strategy for Superior Mechanical Properties in Metals

Outstanding Tensile Properties and Their Origins in Twinning-Induced Plasticity (TWIP) Steels with Gradient Substructures

Contact Info

Product

Resources

About