High dislocation density–induced large ductility in deformed and partitioned steels
TLDR
The deformed and partitioned (D and P) process produced dislocation hardening but retained high ductility, both through the glide of intensive mobile dislocations and by allowing us to control martensitic transformation.Abstract:
A wide variety of industrial applications require materials with high strength and ductility. Unfortunately, the strategies for increasing material strength, such as processing to create line defects (dislocations), tend to decrease ductility. We developed a strategy to circumvent this in inexpensive, medium manganese steel. Cold rolling followed by low-temperature tempering developed steel with metastable austenite grains embedded in a highly dislocated martensite matrix. This deformed and partitioned (D and P) process produced dislocation hardening but retained high ductility, both through the glide of intensive mobile dislocations and by allowing us to control martensitic transformation. The D and P strategy should apply to any other alloy with deformation-induced martensitic transformation and provides a pathway for the development of high-strength, high-ductility materials.read more
Citations
More filters
Journal ArticleDOI
Multicomponent intermetallic nanoparticles and superb mechanical behaviors of complex alloys
Tao Yang,Yilu Zhao,Yang Tong,Zengbao Jiao,Jie Wei,J. X. Cai,Xiaodong Han,Da Chen,Alice Hu,Ji-Jung Kai,Kathy Lu,Y. Liu,C.T. Liu +12 more
TL;DR: A strategy to break this trade-off by controllably introducing high-density ductile multicomponent intermetallic nanoparticles (MCINPs) in complex alloy systems is reported, which offers a paradigm to develop next-generation materials for structural applications.
Journal ArticleDOI
Dynamically reinforced heterogeneous grain structure prolongs ductility in a medium-entropy alloy with gigapascal yield strength
TL;DR: A three-level heterogeneous grain structure with grain sizes spanning the nanometer to micrometer range, imparting a high yield strength well in excess of 1 GPa leads to a sustainable strain hardening rate, a record-wide hysteresis loop in load−unload−reload stress−strain curve and hence high back stresses.
Journal ArticleDOI
Ultrastrong Medium-Entropy Single-Phase Alloys Designed via Severe Lattice Distortion
Seok Su Sohn,Alisson Kwiatkowski da Silva,Yuji Ikeda,Yuji Ikeda,Fritz Körmann,Fritz Körmann,Wenjun Lu,Wonseok Choi,Baptiste Gault,Dirk Ponge,Jörg Neugebauer,Dierk Raabe +11 more
TL;DR: It is shown that a simple VCoNi equiatomic medium-entropy alloy exhibits a near 1 GPa yield strength and good ductility, outperforming conventional solid-solution alloys, demonstrating that severe lattice distortion is a key property for identifying extra-strong materials for structural engineering applications.
Journal ArticleDOI
Development of low-alloyed and rare-earth-free magnesium alloys having ultra-high strength
Hucheng Pan,Gaowu Qin,Yunmiao Huang,Yuping Ren,Xuechao Sha,Xiaodong Han,Zhi-Quan Liu,Cai-Fu Li,Xiaolei Wu,Houwen Chen,Cong He,Linjiang Chai,Yunzhi Wang,Jian Feng Nie,Jian Feng Nie +14 more
TL;DR: In this article, a low-alloyed Mg-2Sn-2Ca alloy (in wt.%) is reported, which exhibits tunable ultra-high tensile yield strength (360-440 MPa) depending on extrusion parameters.
Journal ArticleDOI
Tailoring heterogeneities in high-entropy alloys to promote strength-ductility synergy.
Evan Ma,Xiaolei Wu +1 more
TL;DR: This review explores the multiple levels of heterogeneities in multi-principal-element alloys that contribute to lattice friction and back stress hardening, as a general strategy towards strength–ductility synergy beyond current benchmark ranges.
References
More filters
Journal ArticleDOI
Bulk nanostructured materials from severe plastic deformation
TL;DR: In this article, the authors present methods of severe plastic deformation and formation of nanostructures, including Torsion straining under high pressure, ECA pressing, and multiple forging.
Journal ArticleDOI
Ultrahigh strength and high electrical conductivity in copper
TL;DR: Pure copper samples with a high density of nanoscale growth twins are synthesized and show a tensile strength about 10 times higher than that of conventional coarse-grained copper, while retaining an electrical conductivity comparable to that of pure copper.
Journal ArticleDOI
High tensile ductility in a nanostructured metal.
TL;DR: A thermomechanical treatment of Cu is described that results in a bimodal grain size distribution, with micrometre-sized grains embedded inside a matrix of nanocrystalline and ultrafine (<300 nm) grains, which impart high strength, as expected from an extrapolation of the Hall–Petch relationship.
Journal ArticleDOI
Metastable high-entropy dual-phase alloys overcome the strength–ductility trade-off
TL;DR: In this metastability-engineering strategy, a transformation-induced plasticity-assisted, dual-phase high-entropy alloy (TRIP-DP-HEA) is designed, which combines the best of two worlds: extensive hardening due to the decreased phase stability known from advanced steels and massive solid-solution strengthening of high-ENTropy alloys.
Journal ArticleDOI
The Mechanism of Plastic Deformation of Crystals. Part I. Theoretical
TL;DR: In this article, the authors defined the ration of the relative lateral movement of two parallel planes of slip to the distance between them, defined in the same way as the shear strain considered in the theory of elasticity.