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Simultaneous enhancement of strength and ductility via microband formation and nanotwinning in an L1_(2)-strengthened alloy

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Fundamental Research 2024年第1期4卷 147-157页

作者： Lu Yang Dingshan Liang Zhuo Cheng Ranxi Duan Chuanxin Zhong Junhua Luan Zengbao Jiao Fuzeng Ren Department of Materials Science and Engineering Southern University of Science and TechnologyShenzhen 518055China Department of Materials Science and Engineering City University of Hong KongHong Kong 999077China Department of Mechanical Engineering The Hong Kong Polytechnic UniversityHong Kong 999077China

Metallic alloys with high strength and large ductility are required for extreme structural ***,the achievement of ultrahigh strength often results in a substantially decreased ***,we report a strategy to achieve the strength-ductility synergy by tailoring the alloy composition to control the local stacking fault energy(SFE)of the face-centered-cubic(fcc)matrix in an L1_(2)-strengthened superlattice *** a proof of concept,based on the thermodynamic calculations,we developed a non-equiatomic CoCrNi_(2)(Al_(0.2)Nb_(0.2))alloy using phase separation to create a near-equiatomic low SFE disordered CoCrNi medium-entropy alloy matrix with in situ formed high-content coherent Ni_(3)(Al,Nb)-type ordered nanoprecipitates(∼12 nm).The alloy achieves a high tensile strength up to 1.6 GPa and a uniform ductility of 33%.The low SFE of the fcc matrix promotes the formation of nanotwins and parallel microbands during plastic deformation which could remarkably enhance the strain hardening *** work provides a strategy for developing ultrahigh-strength alloys with large uniform ductility.

关键词： L1_(2)-strengthened superlattice alloy Stacking fault energy Nanotwins microbands Strain hardening

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The Use of a Fe-30%Ni and Fe-30%Ni-Nb Alloy as a Model Systems for Studying the Microstructural Evolution during the Hot Deformation of Austenite

The Use of a Fe-30%Ni and Fe-30%Ni-Nb Alloy as a Model Syste...

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技术创新与循环经济——第二届宝钢学术年会

作者： W.M.RAINFORTH P.CIZEK F.BAI R.POTHS E.J.PALMIERE IMMPETUS:Institute for Microstructural and Mechanical Process Engineering:The University of Sheffield Sheffield S1 3JDUnited Kingdom

＜正＞The development of physically-based models of microstructural evolution during thermomechanical processing of metallic materials requires knowledge of the internal state variable data,such as microstructure, texture and dislocation substructure characteristics,over a range of processing *** is a particular problem for steels,where transformation of the austenite to a variety of transformation products eradicates the hot deformed *** paper reports on a model Fe-30%Ni based alloy,which retains a stable austenitic structure at room temperature,and has therefore been used to model the development of austenite microstructure during hot deformation of conventional low carbon-manganese *** also provides an excellent model alloy system for microalloy *** of the microstructure and crystallographic texture was characterised in detail using optical microscopy,XRD,SEM,EBSD,and *** dislocation substructure has been quantified as a function of crystallographic texture component for a variety of deformation conditions for the Fe-30%Ni base *** extension to this study,as the use of a microalloyed Fe-30%Ni-Nb alloy in which the strain induced precipitation mechanism was studied *** work has shown that precipitation can occur at a much finer scale and higher number density than hitherto considered,but that pipe diffusion leads to rapid *** implications of this for model development are discussed.

关键词： microalloyed steels strain induced precipitation microbands texture

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