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Aging precipitation behavior and properties of Al-Zn-Mg-Cu-Zr-Er alloy at different quenching rates 被引量:9
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作者 Yi-chang WANG Xiao-dong WU +2 位作者 Lu YUE Ming-xing GUO Ling-fei CAO 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2022年第4期1070-1082,共13页
The effect of quenching rate on the aging precipitation behavior and properties of Al-Zn-Mg-Cu-Zr-Er alloy was investigated.The scanning electron microscopy,transmission electron microscopy,and atom probe tomography w... The effect of quenching rate on the aging precipitation behavior and properties of Al-Zn-Mg-Cu-Zr-Er alloy was investigated.The scanning electron microscopy,transmission electron microscopy,and atom probe tomography were used to study the characteristics of clusters and precipitates in the alloy.The quench-inducedηphase and a large number of clusters are formed in the air-cooled alloy with the slowest cooling rate,which contributes to an increment of hardness by 24%(HV 26)compared with that of the water-quenched one.However,the aging hardening response speed and peak-aged hardness of the alloy increase with the increase of quenching rate.Meanwhile,the water-quenched alloy after peak aging also has the highest strength,elongation,and corrosion resistance,which is due to the high driving force and increased number density of aging precipitates,and the narrowed precipitate free zones. 展开更多
关键词 Al-Zn-Mg-Cu-Zr-Er alloy quenching rate aging treatment PRECIPITATE strengthening
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Residual stress and precipitation of Mg-5Zn-3.5Sn-1Mn-0.5Ca-0.5Cu alloy with different quenching rates 被引量:2
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作者 Cong Wang Tianjiao Luo +2 位作者 Yunteng Liu Qiuyan Huang Yuansheng Yang 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2021年第2期604-612,共9页
The effect of the quenching rate after solution treatment on the residual stress and precipitation behavior of a high strength Mg-5 Zn-3.5 Sn-1 Mn-0.5 Ca-0.5 Cu plate is studied.The simulation results show decreasing ... The effect of the quenching rate after solution treatment on the residual stress and precipitation behavior of a high strength Mg-5 Zn-3.5 Sn-1 Mn-0.5 Ca-0.5 Cu plate is studied.The simulation results show decreasing temperature gradient in the plate with decreasing quenching rate,which leads to weakened inhomogeneous plastic deformation and decreased residual stress.No dynamic precipitation on the grain boundary happens after either cold water cooling or air cooling,however,air cooling leads to dynamic precipitation of Mg-Zn phase on Mn particles around which a low-density precipitate zone develops after aging treatment.Moreover,the fine and densely distributed Mg-Zn precipitates observed after aging treatment of the cold water cooled alloy are replaced by coarse precipitates with low density for the air cooled alloy.Both the low-density precipitate zone near Mn particles and the coarsening of precipitates are the source of the decrease in hardness and tensile properties of the air cooled alloy.The residual stress drops faster than the hardness with decreasing quenching rate,which makes it possible to lower the residual stress without sacrificing too much age-hardening ability of the alloy. 展开更多
关键词 Mg-5Zn-3.5Sn-1Mn-0.5Ca-0.5Cu alloy Solution treatment quenching rate Residual stress PRECIPITATION AGE-HARDENING
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Sensitivity of the Impact Toughness and Microstructure of 15CrNi3MoV Steel Under Different Quenching Rates
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作者 Bing Wang Hong-Lin Zhang +3 位作者 Bin Xu Hai-Yang Jiang Ming-Yue Sun Dian-Zhong Li 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2023年第10期1735-1748,共14页
The sensitivities of the mechanical properties and microstructure of 15CrNi3MoV alloy steel under different quenching rates were investigated in the present study.After subjection to quenching with four different cool... The sensitivities of the mechanical properties and microstructure of 15CrNi3MoV alloy steel under different quenching rates were investigated in the present study.After subjection to quenching with four different cooling rates(water cooling,forced air cooling,static air cooling and furnace cooling)followed by tempering,the microstructure was characterized by scanning electron microscopy(SEM),electron back-scattered diffraction(EBSD),and transmission electron microscopy(TEM);and the low-temperature(−20°C)impact toughness was evaluated.The results showed that the tempered microstructure and mechanical properties had high sensitivity to the quenching rate.With a decrease in the quenching rate,the low-temperature impact energy of tempered specimens decreased with increasing fluctuation.Correspondingly,the fracture morphology changed from completely ductile to brittle.In addition,as the quenching cooling rate decreased,the as-quenched matrix changed from a lathy to a polygonal structure with the presence of carbides and martensite-austenite(M-A)constituents,and the effective grain size increased.Tempered martensite with dispersed fine carbides was found in the tempered water cooling specimen,and tempered bainite with a polygonal structure containing large carbides and rare incomplete undecomposed M-A constituents was found in the tempered forced air cooling,static air cooling and furnace cooling specimens.The small effective grain size and fine carbides contributed to the good temperature impact toughness of the tempered water cooling specimens. 展开更多
关键词 Alloy steel quenching cooling rate Impact toughness Martensite-austenite(M-A)constituents Carbides
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Quenching rates for heat equations with coupled singular nonlinear boundary flux 被引量:1
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作者 ZHENG SiNing SONG XianFa 《Science China Mathematics》 SCIE 2008年第9期1631-1643,共13页
We study finite time quenching for heat equations coupled via singular nonlinear boundary flux. A criterion is proposed to identify the simultaneous and non-simultaneous quenchings. In particular, three kinds of simul... We study finite time quenching for heat equations coupled via singular nonlinear boundary flux. A criterion is proposed to identify the simultaneous and non-simultaneous quenchings. In particular, three kinds of simultaneous quenching rates are obtained for different nonlinear exponent regions and appropriate initial data. This extends an original work by Pablo, Quirós and Rossi for a heat system with coupled inner absorption terms subject to homogeneous Neumann boundary conditions. 展开更多
关键词 quenching simultaneous quenching non-simultaneous quenching quenching rate heat equation singular nonlinear boundary flux 35K55 35B40
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Characterization of γ′ precipitates in a nickel base superalloy quenching from aging temperature at different rates 被引量:4
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作者 LI Hongyu, SONG Xiping, WANG Yanli, and CHEN Guoliang State Key Lab for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China 《Rare Metals》 SCIE EI CAS CSCD 2010年第2期204-208,共5页
The characteristics of γ′ precipitates in a superalloy quenched from 1050°C at different rates were investigated using field emission scanning electron microscope(FESEM).When quenched from 1050°C, the si... The characteristics of γ′ precipitates in a superalloy quenched from 1050°C at different rates were investigated using field emission scanning electron microscope(FESEM).When quenched from 1050°C, the size of primary aging γ′ precipitates has a small increase in the specimens that experienced iced-brine-quenching, oil-quenching, and air-cooling-quenching conditions and a drastic increase in the specimen that experienced a furnace-cooling-quenching condition.The cooling γ′ precipitates have unimodal distributions after quenching at the air-cooling rate and bimodal distributions after quenching at the furnace-cooling rate, but there are not these distributions in the specimens that experienced iced-brine-quenching and oil-quenching conditions.When aging at 760°C, the size of primary aging γ′ precipitates appears unaffected in the specimens that experienced iced-brine-quenching, oil-quenching, and air-cooling-quenching conditions.However, it has a drastic increase in the specimen that experienced a furnace-cooling-quenching condition, and it is interesting that the bigger cooling γ′ precipitates have a coalescence and octodendritic shape.The microhardness study indicates that the hardness has no variation in the specimens that experienced iced-brine-quenching, oil-quenching, and air-cooling-quenching conditions and has a drastic decrease in the specimens that experienced a furnace-cooling-quenching condition and obtains the minimum microhardness value 390.8 HV. 展开更多
关键词 superalloys precipitates quenching rate microhardness
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Effect of quenching rate on microstructure and stress corrosion cracking of 7085 aluminum alloy 被引量:22
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作者 CHEN Song-yi CHEN Kang-hua +2 位作者 PENG Guo-sheng LIANG Xin CHEN Xue-hai 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2012年第1期47-52,共6页
The influence of quenching rate on microstructure and stress corrosion cracking (SCC) of 7085 aluminum alloy was investigated by tensile test, slow strain rate test (SSRT), combined with scanning electron microsco... The influence of quenching rate on microstructure and stress corrosion cracking (SCC) of 7085 aluminum alloy was investigated by tensile test, slow strain rate test (SSRT), combined with scanning electron microscopy (SEM), transmission electron microscopy (TEM) and electrochemical test. The results show that with decreasing the quenching rate, the size and inter-particle distance of the grain boundary precipitates as well as precipitation free zone width increase, but the copper content of grain boundary precipitates decreases. The SCC resistance of the samples increases first and then decreases, which is attributed to the copper content, size and distribution of grain boundary precipitates. 展开更多
关键词 7085 aluminum alloy quenching rate MICROSTRUCTURE stress corrosion cracking
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Optimization of Quenching Process for ZTAP/ High Chromium Cast Iron Composites
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作者 WEI Hongming JIANG Yehua +3 位作者 ZHANG Xiaozu JIA Yuanwei ZHOU Mojin XUE Da 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2022年第6期1137-1142,共6页
In order to solve the problem of cracking of ZTAP(Zirconia toughened alumina ceramic particles)reinforced HCCI(high chromium cast iron)matrix composites,the quenching process was optimized.ZTAP reinforced HCCI matrix ... In order to solve the problem of cracking of ZTAP(Zirconia toughened alumina ceramic particles)reinforced HCCI(high chromium cast iron)matrix composites,the quenching process was optimized.ZTAP reinforced HCCI matrix composites were prepared by infiltration method with gravity sand casting.The thermal expansion curves of HCCI and the composites were measured at different cooling rates by Glebble-3500.The microstructure of the HCCI matrix and the composites were characterized by X-ray diffraction,light microscopy,SEM,ESD,and EPMA.The tested mechanical properties include Rockwell hardness and impact toughness.The deformation differences of HCCI and the composite at different cooling rates were obtained according to the test results of thermal expansion coefficient curve and changes in microstructure and mechanical properties,and air cooling was the most favorable for the composites to have good hardness and not easy to crack.The cooling rate during air cooling is approximately equal to 21℃/s in this work.When the quenching process was air cooling,the impact toughness and hardness of the composites are 3.7 J/cm^(2) and 61.8 HRC,respectively,and the deformation difference between the composites and HCCI was 20μm at 300℃. 展开更多
关键词 COMPOSITES ZTAP quenching cooling rate MICROSTRUCTURE thermal expansion
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Quenching Estimates for Reaction-diffusion Equations with Nonstandard Growth Conditions
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作者 LIU Bing-chen HONG Zhen-zhen 《Chinese Quarterly Journal of Mathematics》 CSCD 2013年第3期408-416,共9页
This paper deals with reaction-diffusion equations involving nonstandard growth conditions, subject to homogeneous Neumann boundary conditions. The complete clas- sification is established for simultaneous and non-sim... This paper deals with reaction-diffusion equations involving nonstandard growth conditions, subject to homogeneous Neumann boundary conditions. The complete clas- sification is established for simultaneous and non-simultaneous quenching under suitable assumptions on initial data. Moreover, quenching sets and quenching rates are obtained. 展开更多
关键词 nonstandard growth conditions simultaneous quenching non-simultaneous quenching quenching set quenching rate
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ON THE CAUCHY PROBLEM FOR A REACTION-DIFFUSION SYSTEM WITH SINGULAR NONLINEARITY 被引量:2
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作者 周军 《Acta Mathematica Scientia》 SCIE CSCD 2013年第4期1031-1048,共18页
We consider the growth rate and quenching rate of the following problem with singular nonlinearityfor some positive constants b:, b2 (see Theorem 3.3 for the parametersfor some constantsHence, the solution (u, v) ... We consider the growth rate and quenching rate of the following problem with singular nonlinearityfor some positive constants b:, b2 (see Theorem 3.3 for the parametersfor some constantsHence, the solution (u, v) quenches at the originx = 0 at the same time '1' (see Theorem 4.3). We also tind various other conditions tor the solution to quench in a finite time and obtain the corresponding decay rate of the solution near the quenching time. 展开更多
关键词 Cauchy problems singular nonlinearity growth rate quenching rate
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Mechanical behavior of Cu-Zr bulk metallic glasses (BMGs): A molecular dynamics approach
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作者 Muhammad Imran Fayyaz Hussain +2 位作者 Muhammad Rashid Yongqing Cai S.A.Ahmad 《Chinese Physics B》 SCIE EI CAS CSCD 2013年第9期490-495,共6页
In the present work, three-dimensional molecular dynamics simulation is carried out to elucidate the nanoinden- tation behaviors of CuZr Bulk metallic glasses (BMGs). The substrate indenter system is modeled using h... In the present work, three-dimensional molecular dynamics simulation is carried out to elucidate the nanoinden- tation behaviors of CuZr Bulk metallic glasses (BMGs). The substrate indenter system is modeled using hybrid interatomic potentials including both many-body Finnis Sinclair (FS) and two-body Morse potentials. A spherical rigid indenter (diameter= 60 A(1 A = 10 ^-10 m)) is employed to simulate the indentation process. Three samples of BMGs including Cu25Zr75, CusoZr50, and Cu75Zr25 are designed and the metallic glasses are formed by rapid cooling from the melt state at about 2000 K. The radial distribution functions are analyzed to reveal the dynamical evolution of the structure of the atoms with different compositions and different cooling rates. The mechanical behavior can be well understood in terms of load-depth curves and Hardness-depth curves during the nanoindentation process. Our results indicate a positive linear relationship between the hardness and the Cu concentration of the BMG sample. To reveal the importance of cooling rate provided during the processing of BMGs, we investigate the indentation behaviors of CusoZr50 at three different quenching rates. Nanoindentation results and radial distribution function (RDF) curves at room temperature indicate that a sample can be made harder and more stable by slowing down the quenching rate. 展开更多
关键词 Bulk metallic glasses (BMGs) NANOINDENTATION DEFORMATION quenching rate
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PIPBQ Effect Aware SER Analysis for Combinational Logic Circuits
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作者 Ai-Bin Yan Hua-Guo Liang +2 位作者 Zheng-Feng Huang Zhi Wang Cui-Yun Jiang 《Journal of Electronic Science and Technology》 CAS CSCD 2016年第1期60-67,共8页
Technology scaling results in the propagation-induced pulse broadening and quenching(PIPBQ) effect become more noticeable.In order to effectively evaluate the soft error rate for combinational logic circuits,a soft ... Technology scaling results in the propagation-induced pulse broadening and quenching(PIPBQ) effect become more noticeable.In order to effectively evaluate the soft error rate for combinational logic circuits,a soft error rate analysis approach considering the PIPBQ effect is proposed.As different original pulse propagating through logic gate cells,pulse broadening and quenching are measured by HSPICE.After that,electrical effect look-up tables(EELUTs) for logic gate cells are created to evaluate the PIPBQ effect.Sensitized paths are accurately retrieved by the proposed re-convergence aware sensitized path search algorithm.Further,by propagating pulses on these paths to simulate fault injection,the PIPBQ effect on these paths can be quantified by EELUTs.As a result,the soft error rate of circuits can be effectively computed by the proposed technique.Simulation results verify the soft error rate improvement comparing with the PIPBQ-not-aware method. 展开更多
关键词 Pulse broadening and quenching effect re-convergence single event transient soft error rate
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A study of the quenching of PCl(b1∑+) by the E-V model
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作者 LIU, Chuan-Pu ZOU, Sheng-Li GUO, Jing-Zhong GU, Yue-ShuDepartment of Chemistry, Shandong University, Jinan, Shandong 250100, ChinaCHU, Yan-Nan CAO, De-ZhaoLaser Spectroscopy Laboratory, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei, Anhui 230031, China 《Chinese Journal of Chemistry》 SCIE CAS CSCD 1997年第3期211-217,共7页
Using the reaction of Ar(3Po,2) + PCl3 as a source of PCl(b1 +), we have measured the quenching rate constants of PCl(b,v'=0) for more than 20 quenchers. The E-V model is used to calculate the rate constants. The ... Using the reaction of Ar(3Po,2) + PCl3 as a source of PCl(b1 +), we have measured the quenching rate constants of PCl(b,v'=0) for more than 20 quenchers. The E-V model is used to calculate the rate constants. The comparison of the calculated values with the experimental ones shows that the quenching of PCl(b) by the reagent molecules results from the electronic to vi-brational energy near resonance transfer and has been related to the Franck-Condon factors for the PCl(b,v'=0-a,v'=m) transition and to the anharmonicities of the terminal bonds of the quenchers. In addition, the influence of the polarizability of the reagent molecule on the quenching rate constant is discussed. 展开更多
关键词 Metastable molecule PCl(b 1∑+) E-V energy transfer quenching rate constant
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Effect of rapid solidification treatment on structure and electrochemical performance of low-Co AB5-type hydrogen storage alloy 被引量:5
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作者 姚青荣 唐莹 +5 位作者 周怀营 邓健秋 王仲民 潘顺康 饶光辉 朱其明 《Journal of Rare Earths》 SCIE EI CAS CSCD 2014年第6期526-531,共6页
The effect of rapid solidification on structure and electrochemical performance of the LaNi4.5Co0.25Al0.25 hydrogen storage alloy was investigated by X-ray powder diffraction and a simulated battery test, including ma... The effect of rapid solidification on structure and electrochemical performance of the LaNi4.5Co0.25Al0.25 hydrogen storage alloy was investigated by X-ray powder diffraction and a simulated battery test, including maximum capacity, cycling stability, self-discharge, and high-rate discharge ability (HRD). All the melt-spun alloys were single-phase with the CaCu5-type structure (space groupP6/mmm). In comparison to the as-cast alloy, the rapidly quenched alloys manifested an improved homogeneity of com-position and expanded lattice parameters. The electrochemical measurements showed that the activation property, cycling stability and self-discharge of the alloy electrodes were also improved for the rapid solidified alloys. The HRDof the as-cast alloy was better than those of all the rapidly solidified alloys. As the quenching rate increased, the HRD and exchange current density first decreased and then increased. 展开更多
关键词 hydrogen storage alloy electrochemical properties rapid solidification quenching rate rare earths
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Crystallographic alignment and magnetic anisotropy in melt-spun Nd-Fe-B/α-Fe composite ribbons with different neodymium contents 被引量:3
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作者 王磊 陈静武 +6 位作者 岳明 刘荣明 刘卫强 张东涛 张久兴 张朋越 葛洪良 《Journal of Rare Earths》 SCIE EI CAS CSCD 2011年第5期471-473,共3页
Crystallographic alignment and magnetic anisotropy were studied for NdxFe94–xB6 (x=8,9,10,11) ribbons prepared via melt-spinning. Effect of Nd content and wheel speed on the crystal structure and magnetic propertie... Crystallographic alignment and magnetic anisotropy were studied for NdxFe94–xB6 (x=8,9,10,11) ribbons prepared via melt-spinning. Effect of Nd content and wheel speed on the crystal structure and magnetic properties of the ribbons was investigated. Both the free and wheel side of the ribbons could obtain strong c-axis crystal texture of Nd2Fe14B phase perpendicular to the ribbons surface at low wheel speed,but the texture weakened gradually with the increase of the wheel speed. Increase of Nd content led to better formation of crystal texture in the ribbons,indicating that the α-Fe phase might undermine the formation of crystal texture. Magnetic measurement results showed that the magnetic anisotropy of the ribbons exhibited corresponding behavior with the invariance of the c-axis crystal texture of Nd2Fe14B phase in the ribbons,and the coercivity of the ribbons rose with the increase of both Nd content and wheel speed during melt-spun process. 展开更多
关键词 crystallographic alignment magnetic anisotropy Nd content quenching rate COERCIVITY rare earths
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