Advancing layered cathode material's cycling stability from uniform doping to non-uniform doping

2020 ◽  
Vol 8 (32) ◽  
pp. 16690-16697 ◽  
Author(s):  
Kuan Wang ◽  
Pengfei Yan ◽  
Zelin Wang ◽  
Junjie Fu ◽  
Zhenlu Zhang ◽  
...  
Keyword(s):  
Cycling Stability ◽  
Precipitation Strengthening ◽  
Strengthening Effect ◽  
Dopant Segregation ◽  
Uniform Doping

Dopant segregation induced precipitates can further improve the cycling stability of a P2-layered cathode due to the precipitation strengthening effect, which conceptually validates that non-uniform doping has big advantage over uniform doping.

Comparison of the strengthening effects of Nb, V, and Ti on the mechanical properties of 20MnSi low-alloy steel

2020 ◽  
Vol 111 (6) ◽  
pp. 504-510
Author(s):  
Qingxiao Zhang ◽  
Qing Yuan ◽  
Wenwei Qiao ◽  
Guanghui Chen ◽  
Guang Xu
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Grain Refinement ◽  
Alloy Steel ◽  
Precipitation Strengthening ◽  
Strengthening Effect ◽  
Strengthening Mechanisms ◽  
Low Alloy Steel ◽  
Average Grain Size ◽  
Base Steel

Abstract Three alloys, containing niobium, vanadium and titanium, respectively, were refined and the strengthening effect attained after adding them individually in a 20MnSi low-alloy rebar steel was investigated. The results show that the strengthening effect attained due to the addition of niobium is the best, whereas that due to the addition of titanium is the poorest. Grain refinement and precipitation strengthening are the main strengthening mechanisms observed in niobium-steel and vanadium-steel, whereas only precipitation strengthening is observed in titanium-steel. Moreover, the average grain size of niobium-steel is the smallest among the four types of steels, while the size of ferrite and pearlite microstructures show almost no obvious change as compared to the base steel in the case of titanium-steel. Furthermore, the volume fractions of ferrite and pearlite in the four tested steels have no noticeable change.

The Precipitation Strengthening Effect of Nb, Ti and Al in Cast/Wrought Ni-Base Superalloys

2010 ◽  
Vol 638-642 ◽  
pp. 2363-2368 ◽  
Author(s):  
Xi Shan Xie ◽  
Shu Hong Fu ◽  
Shuang Qun Zhao ◽  
Jian Xin Dong
Keyword(s):  
High Temperatures ◽  
Experimental Results ◽  
Precipitation Strengthening ◽  
Structure Stability ◽  
Second Phase ◽  
Strengthening Effect ◽  
Phase Precipitation ◽  
Careful Control

The second phase precipitation strengthening effect of , +, + phases in INCONEL718 type and newly developed INCONEL740® Ni-base superalloys and their structure stability have been studied. Experimental results show that careful control of Nb, Ti and Al for alloy modification can not only raise their strengths but also improve structure stability at high temperatures. These modified newly developed alloys are suggested to be used at higher temperatures.

scholarly journals Annealing effect of micro-alloying on the microstructure and properties of Cu-10Zn alloy

2019 ◽  
Vol 136 ◽  
pp. 01015
Author(s):  
Wei Chen ◽  
Jiarui Hu ◽  
Yi Xie ◽  
Hengyi Zhou ◽  
Chao Feng ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Aging Process ◽  
Conductivity Measurement ◽  
Hardness Test ◽  
Precipitation Strengthening ◽  
Strengthening Effect ◽  
Electrical Conductivity Measurement ◽  
Microstructure And Properties ◽  
Transmission Electron ◽  
The Matrix

The effect of Fe and P (Ni and Si) on the microstructure and properties of Cu-10Zn alloys has been investigated using hardness test, electrical conductivity measurement, optical microscopy and transmission electron microscopy. γ-Fe precipitates formed during the aging process, but there is almost no effect of precipitation strengthening on the Cu-Zn-Fe-P alloy and sparsely Fe3P precipitates existed in the matrix. After homogenization treatment at 900°C for 2h, hot rolling by 80%, cold rolling by 80%, and ageing treatment at 400°C for 30min, Cu-Zn-Ni-Si alloy obtained good combinations of hardness (219.8HV) and electrical conductivity(28.2%IACS). Ni2Si precipitates formed during aging process and the crystal orientation relationship between matrix and precipitates is:(200)α || (100)δ, [100]α || [010]δ,. Compared with Cu-Zn-Fe-P, Cu-Zn-Ni-Si has finer grains, and the precipitation strengthening effect is more obvious.

Influence of Microstructure and Precipitates on the Strength of Container Steel

2012 ◽  
Vol 586 ◽  
pp. 225-229
Author(s):  
Jia Yan Ma ◽  
Wen Liang ◽  
Rong Dong Han ◽  
Yun Guan ◽  
Zhao Jun Deng
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Transmission Electron Microscope ◽  
Optical Microscope ◽  
The Other ◽  
Precipitation Strengthening ◽  
Strengthening Effect ◽  
Transmission Electron ◽  
Uniform Dispersion ◽  
Scanning Electron

The variation rules of strength with the microstructure and precipitates of container steel were studied by optical microscope (OM), scanning electron microscope (SEM) and transmission electron microscope (TEM). The results show that the microstructures of four kinds of test steels are all bainite and M/A island, but the number and size of islands of M/A and precipitates exist obvious difference: two kinds of test steels have fewer precipitates and more M/A islands, however, the other two kinds of steels are on the contrary. As for the former two kinds steels, the number of M/A islands is larger, and the size is smaller, the strength of steel is higher; For the later two kinds steels, the number of precipitates less than 30nm is larger, and distribution is more uniform dispersion, the strength is higher, precipitation strengthening effect is better. Getting lots of small and uniform M/A islands or precipitates is an effective way of improving the performance of steel.

Effect of Forging Process on V-Nb-Ti Microalloyed Non-Quenched and Tempered Steels

2014 ◽  
Vol 936 ◽  
pp. 1179-1183 ◽  
Author(s):  
Ting Hui Man ◽  
Peng Gao ◽  
Yi Gui He ◽  
Zhao Lin Zhan ◽  
Li Tan ◽  
...  
Keyword(s):  
Grain Size ◽  
Dynamic Recrystallization ◽  
Precipitation Strengthening ◽  
Recrystallization Temperature ◽  
Strengthening Effect ◽  
Forging Process ◽  
Microstructure Refinement ◽  
Proeutectoid Ferrite ◽  
And Performance ◽  
Microstructure And Performance

The effect of forging process on microstructure and performance of V-Ti, V-Nb-Ti non-quenched and tempered microalloying steel was investigated in this study. By comparing the characteristics between V-Ti and V-Nb-Ti microalloyed non-quenched and tempered steels by the forging process,the machinsm of micro-alloy technology and forging process for dynamic recrystallization and microstructure refinement was investigated. It revealed that addition of Nb in micro-alloying steel can increase significantly non-recrystallization temperature during forging process, and enhance the V (C, N) precipitation strengthening effect of V-Ti microalloyed non-quenched and tempered steels. V-Nb-Ti microalloying technology and controlling forging temperature in non-recrystallization region, can refine grain size, promote proeutectoid ferrite emerging and pearlite morphology alienating. By controlling final forging temperature in non-recrystallization region, the strength and toughness of V-Nb-Ti micro-alloy non-quenched and tempered steels can be improved.

scholarly journals Quantification and Modelling of the Multiphase-Coupled Strengthening Effect in Al-Cu-Li Alloy

Metals ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 1038
Author(s):  
Jin Zhang ◽  
Zhide Li ◽  
Fushun Xu ◽  
Chongjun Bao
Keyword(s):  
Heat Treatment ◽  
Aluminum Alloys ◽  
Precipitation Strengthening ◽  
Strengthening Effect ◽  
Superposition Model ◽  
Aging Heat Treatment ◽  
Volume Fractions ◽  
Age Strengthening ◽  
Precipitated Phases ◽  
Strengthening Phases

After aging heat treatment, Al-Cu-Li alloy, in general, contains a variety of precipitated phases that jointly influence the age-strengthening effect on the alloy. In this work, a multiphase-coupled strengthening model has been established on the basis of a dislocation bypassing mechanism. The model considered situations with different proportions of two strengthening phases, T1 and θ′, and then obtained the dimension and volume fractions of these two strengthening phases via experiments. The values predicted by the multiphase-coupled strengthening model and the classical strengthening superposition model were compared with the measured results. The multiphase-coupled strengthening model established in this work had better consistency with the measured results. Moreover, the modeling method proposed in the paper can also be extended to the system having over two primary strengthening phases. Hence, the model can contribute towards the development of a multi-component precipitation strengthening process for aluminum alloys.

Influence of Cu Addition on Microstructure and Mechanical Properties of Fe-0.08C-1Mn-2.5Ni Steel

2018 ◽  
Vol 941 ◽  
pp. 686-691
Author(s):  
Xiao Hui Xi ◽  
Li Qing Chen ◽  
Yang Zhao ◽  
Zhao Dong Wang
Keyword(s):  
Mechanical Properties ◽  
Microstructural Characterization ◽  
Strengthening Mechanism ◽  
Precipitation Strengthening ◽  
Strengthening Effect ◽  
Transmission Electron ◽  
Hot Rolled ◽  
The Comparative Study ◽  
Hot Rolled Steel ◽  
Quenching And Tempering

In addition to precipitation strengthening effect as Cu precipitates in steel, Cu-containing steel is generally believed to have ability to resist corrosion. However, there are some issues, e.g. strengthening mechanism and appropriate copper content, remaining to be clarified. In this presentation, an offshore platform steel Fe-0.08C-1Mn-2.5Ni was used as experimental materials and the emphasis was put on the comparative study of Cu-addition in terms of microstructural evolution and mechanical properties by using microstructural characterization and mechanical properties measurement. The continuous cooling transformation behavior of the two Cu-containing steels with varying contents was first compared. The Cu-containing precipitates were then determined by transmission electron microscopy (TEM) in the hot rolled steel plate after quenching and tempering. Finally, the effect of Cu-addition on precipitation strengthening and low temperature toughness was discussed considering the interaction of Cu precipitates with dislocation and martensite microstructure.

A Study of the Microstructural Evolution and Strengthening Effects of Non-Spherical Precipitates in an Al-Cu-Based Alloy

2007 ◽  
Vol 561-565 ◽  
pp. 2317-2320
Author(s):  
Julien da Costa Teixeira ◽  
Laure Bourgeois ◽  
Christopher R. Hutchinson
Keyword(s):  
Microstructural Evolution ◽  
Classical Case ◽  
Precipitation Strengthening ◽  
Strengthening Effect ◽  
Microstructure Design ◽  
Plate Shape ◽  
Microstructure Parameters ◽  
Isothermal Ageing

The microstructural evolution and associated strengthening during isothermal ageing of an Al-3Cu-0.05Sn reinforced by non-spherical θ' (Al2Cu) precipitates is studied. Emphasis is placed on the plate shape of the θ'. It is found that the microstructure parameters governing the magnitude of the precipitation strengthening effect are completely different from the classical case of spherical precipitates. New possibilities for microstructure design are discussed.

scholarly journals The Impact of Isothermal Treatment on the Microstructural Evolution and the Precipitation Behavior in High Strength Linepipe Steel

Materials ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 634
Author(s):  
Yong Tian ◽  
Hongtao Wang ◽  
Xiaoning Xu ◽  
Zhaodong Wang ◽  
R.D.K. Misra ◽  
...  
Keyword(s):  
Microstructural Evolution ◽  
High Strength ◽  
Interparticle Spacing ◽  
Grain Structure ◽  
Granular Bainite ◽  
Precipitation Strengthening ◽  
Isothermal Treatment ◽  
Strengthening Effect ◽  
Precipitation Behavior ◽  
The Impact

Isothermal treatment affects the microstructural evolution and the precipitation behavior of high-strength low alloy (HSLA) steels. In this regard, thermal simulation of different isothermal treatment temperatures was adopted by using a thermomechanical simulator. The results showed that hardness reached the maximum value at 600 °C holding temperature, which was related to a finer grain structure and granular bainite. The strengthening effect of precipitates was remarkable due to the combination of small particle size and small interparticle spacing. It is presumed that the precipitation started after 600 s at 600 °C. Precipitation strengthening continued to exist, even though coarsening of ferrite grains led to softening phenomena when the specimen was isothermally held at 750 °C, which led to relatively high hardness. The precipitates were fcc (Ti, Nb) (N, C) particles, and belonged to MX-type precipitates. Average size of precipitates increased from 3.14 to 4.83 nm when the specimens were isothermally held between 600 °C and 800 °C. Interparticle spacing of precipitates also increased with increasing isothermal treatment temperatures. These led to a reduction in precipitation strengthening. At the same time the polygonal ferrite content increased and ferrite grain size got larger, such that the hardness decreased continuously.

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