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Toward the development of Mg alloys with simultaneously improved strength and ductility by refining grain size via the deformation process 被引量:27
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作者 Zhi Zhang Jing-huai Zhang +5 位作者 Jun Wang Ze-hua Li Jin-shu Xie Shu-juan Liu Kai Guan Rui-zhi Wu 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2021年第1期30-45,共16页
Magnesium(Mg) alloys, as the lightest metal engineering materials, have broad application prospects.However, the strength and ductility of traditional Mg alloys are still relativity low and difficult to improve simult... Magnesium(Mg) alloys, as the lightest metal engineering materials, have broad application prospects.However, the strength and ductility of traditional Mg alloys are still relativity low and difficult to improve simultaneously.Refining grain size via the deformation process based on the grain boundary strengthening and the transition of deformation mechanisms is one of the feasible strategies to prepare Mg alloys with high strength and high ductility.In this review, the effects of grain size on the strength and ductility of Mg alloys are summarized, and fine-grained Mg alloys with high strength and high ductility developed by various severe plastic deformation technologies and improved traditional deformation technologies are introduced.Although some achievements have been made, the effects of grain size on various Mg alloys are rarely discussed systematically and some key mechanisms are unclear or lack direct microscopic evidence.This review can be used as a reference for further development of high-performance fine-grained Mg alloys. 展开更多
关键词 magnesium alloys grain refinement high strength high ductility deformation process
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The Heat Treatment Behavior of Super-High Strength Aluminum Alloys by Spray Forming 被引量:1
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作者 Guowei Zhang Zheng Chen +3 位作者 Xiurong Zhu Gang Chen Jing Zhai Anzhen Guo 《Journal of Materials Science and Chemical Engineering》 2013年第5期57-60,共4页
In order to understand the stress corrosion behavior of super-high strength aluminum alloys by spray forming, different aluminum alloys by different heat treatment was made. The results showed that the alloy with peak... In order to understand the stress corrosion behavior of super-high strength aluminum alloys by spray forming, different aluminum alloys by different heat treatment was made. The results showed that the alloy with peak aging has the most sensitive stress corrosion cracking, the crack can even be seen using eyes;the alloys with two step aging were better than one step aging alloys, the alloys has not been found stress corrosion cracking. 展开更多
关键词 Super-High ALUMINUM ALLOYS SPRAY FORMING Stress Corrosion CRACK
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Numerical Simulation and Experimental Research on Penetration of Composite Ceramic Armor by Rod Projectile
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作者 付克勤 张金咏 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2010年第6期1006-1010,共5页
The performance of composite ceramic armor penetrated by rod projectile was studied by both numerical simulation and experiment.The penetration and damage mechanisms of the projectile-armor after high-speed collision ... The performance of composite ceramic armor penetrated by rod projectile was studied by both numerical simulation and experiment.The penetration and damage mechanisms of the projectile-armor after high-speed collision were also observed by high-speed photography.The experimental results showed that the ballistic performance of composite ceramic armor was highly affected by the density,hardness and toughness of bulletproof ceramic.The flow stress of the failed bulletproof ceramic is not only related to the pressure but also related to the strain rate.The phenomenological method based on Bodner-Partom ceramic model was introduced to derive the growth rate of damage.Numerical simulation results show good agreement with the experimental results. 展开更多
关键词 composite ceramic armor rod projectile numerical simulation experiment DAMAGE
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Phase and microstructure of CVD alumina-silica coating deposited at relative low temperature
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作者 陈照峰 赵保荣 +2 位作者 朱秀荣 严波 李聪 《中国有色金属学会会刊:英文版》 CSCD 2005年第S3期402-406,共5页
Alumina-silica composite coatings were prepared on the surface of graphite paper by CVD using AlCl3/SiCl4/H2/CO2 as precursor in the temperature range of 300 to 550℃. XRD and SEM were used to examine the phase comp... Alumina-silica composite coatings were prepared on the surface of graphite paper by CVD using AlCl3/SiCl4/H2/CO2 as precursor in the temperature range of 300 to 550℃. XRD and SEM were used to examine the phase composition and the microstructure of the coating, respectively. The results indicate that the dense, uniform and adherent alumina-silica composite coating can be prepared on graphite paper substrate by CVD at 550℃ using SiCl4/AlCl3/CO2/H2. The alumina-silica composite coating is composed of a number of spherical particles. Each particle is composed of a number of fine-particle. The phase of the 550℃ composite coating includes γ-alumina containing amorphous silica. The content of Cl element in composite coating decreases with the increase of the deposition temperature. The analysis results of morphology and growth mechanisms of the CVD alumina-silica indicate that the condensation within the boundary layer will be more likely to lead to the formation of gel-particles. The gel-particles size decreases with the increase of deposition temperature in the range of 300550℃. Surface reaction is the main path to generate deposition products at 550℃. 展开更多
关键词 alumina-silica composite coating PHASE MICROSTRUCTURE CVD low temperature
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In-situ Preparation of TiB_2-TiB-Ti Functionally Graded Materials by Improved Sintering Process
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作者 刘国玺 LI Kezhi +1 位作者 ZHANG Jinyong 张帆 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2015年第4期710-714,共5页
An improved multi-step sintering process was used to in-situ prepare TiB2-TiB-Ti FGMs. According to the sintering temperatures, the functionally graded materials (FGMs) were divided into three sections. After sinter... An improved multi-step sintering process was used to in-situ prepare TiB2-TiB-Ti FGMs. According to the sintering temperatures, the functionally graded materials (FGMs) were divided into three sections. After sintering at a proper temperature, the three sections were sintered together in turn. The experimental results showed that there were no obvious pores and cracks in the whole TiB2-TiB-Ti FGMs, and no delamination was found in the impacting test with good performance features, which indicated that there were no interface effects in FGMs during penetration, so that the TiB2-TiB-Ti FGMs were an ideal FGM. 展开更多
关键词 FGMS TIB2 TI FABRICATION
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Microstructure and Mechanical Properties of TiB_2-Al_2O_3 Composites
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作者 刘国玺 张金咏 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2011年第4期696-699,共4页
Effects of Al2O3 and Ni as the additives on the sinterability, microstructure and mechanical properties were systematic studied. The experimental results show that only a relative density about 96.2% of hot-pressing T... Effects of Al2O3 and Ni as the additives on the sinterability, microstructure and mechanical properties were systematic studied. The experimental results show that only a relative density about 96.2% of hot-pressing TiB2-30%Al2O3 can be attained due to the plate-like TiB2 particle and its random orientation and excessive Al2O3 grain growth. When sintering temperature is higher than 1 700 ℃, TiB2 grain growth can be found, which obvious improves flexural strength of TiB2 matrix but decreases toughness. It seems that mechanical properties of TiB2-Al2O3 composites are mainly depended on relative density besides grain growth. otherwise, they will be determined by relative density and TiB2 matrix strength together. Anyway, Al2O3 addition can weaken the grain boundary and thus improve the toughness of the materials. A flexural strength of 529 MPa, Vickers hardness of 24.8 GPa and indentation toughness of 4.56 MPa·m1/2 can be achieved inTiB2-30vol% Al2O3. 展开更多
关键词 TiB2-Al2O3 pressureless sintering MICROSTRUCTURE mechanical properties
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Effect of ball-milling parameter on mechanical and damping properties of sintered Mg-Zr alloy
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作者 刘子利 刘希琴 +2 位作者 沈平 朱秀荣 孟亮 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2010年第11期2092-2095,共4页
Effects of ball-milling parameter on structures and properties of sintered Mg-l.5Zr (mass fraction, %) alloy were researched by metallographic analysis, mechanical properties tests and DMA technology. The results in... Effects of ball-milling parameter on structures and properties of sintered Mg-l.5Zr (mass fraction, %) alloy were researched by metallographic analysis, mechanical properties tests and DMA technology. The results indicate that with 310 r/min rotation speed, the microstructure of the sintered alloy is greatly refined, and Zr-phase distributes uniformly. The micro-hardness, bending strength and damping capacities are the greatest under 310 r/min rotation speed. The damping peak of sintered Mg-l.5Zr alloy increases with increasing frequency under the testing conditions. The relaxation time meets the Arrhenius relationship, and shows the characteristics of relaxation damping. 展开更多
关键词 Mg-Zr alloy ball-milling parameter damping capacities
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Study on heat treatment blister of squeeze casting parts
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作者 TONG Wen-jun QI Lin QI Pi-xiang 《China Foundry》 SCIE CAS 2007年第2期108-111,共4页
Heat treatment blister is one of the common defects found in squeeze casting parts, which is related to squeeze mode, process and mold. For direct squeeze-casting parts, solution heat treatment can be performed smooth... Heat treatment blister is one of the common defects found in squeeze casting parts, which is related to squeeze mode, process and mold. For direct squeeze-casting parts, solution heat treatment can be performed smoothly as long as oil-based paint is not used and air exhaust is well arranged. For indirect squeeze casting parts, solution heat treatment can also be applied when additional factors are taken into consideration, including well designed internal feeding system and strictly controlled liquid metal filling velocity to prevent from inclusions. 展开更多
关键词 squeeze casting DEFECTS heat treatment
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Fast Welding of Chromium Carbide and Nickel Alloy by Spark Plasma Sintering
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作者 刘国玺 LI Kezhi +2 位作者 LENG Xiaoxuan 张金咏 ZHANG Fan 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2016年第4期835-837,共3页
Spark plasma sintering(SPS) was used to weld the ceramics,eg,Cr3C2 and metal,Ni in this paper.It is found that the SPS can weld the Cr3C2 and Ni plates at lower temperatures and shorter holding time comparing with t... Spark plasma sintering(SPS) was used to weld the ceramics,eg,Cr3C2 and metal,Ni in this paper.It is found that the SPS can weld the Cr3C2 and Ni plates at lower temperatures and shorter holding time comparing with that of hot-pressing(HP).The binding strength was 113 MPa when the temperature was 1000 ℃ by SPS,compared with 10 MPa by HP at the same temperature.SPS remarkably enhances the atom diffusion in welding.Thermodynamics analysis at different welding temperatures and holding times of SPS or HP shows that the local temperature gradient,different from the past effects of by-passing current,is the dominative mechanism of the SPS welding. 展开更多
关键词 Sintering welding Welding holding ceramics sintering welded pressing remarkably heating
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Designing new low alloyed Mg-RE alloys with high strength and ductility via high-speed extrusion 被引量:6
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作者 Jinshu Xie Zhi Zhang +6 位作者 Shujuan Liu Jinghuai Zhang Jun Wang Yuying He Liwei Lu Yunlei Jiao Ruizhi Wu 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2023年第1期82-91,共10页
Two new low-alloyed Mg-2RE-0.8Mn-0.6Ca-0.5Zn(wt%,RE=Sm or Y)alloys are developed,which can be produced on an in-dustrial scale via relatively high-speed extrusion.These two alloys are not only comparable to commercial... Two new low-alloyed Mg-2RE-0.8Mn-0.6Ca-0.5Zn(wt%,RE=Sm or Y)alloys are developed,which can be produced on an in-dustrial scale via relatively high-speed extrusion.These two alloys are not only comparable to commercial AZ31 alloy in extrudability,but also have superior mechanical properties,especially in terms of yield strength(YS).The excellent extrudability is related to less coarse second-phase particles and high initial melting point of the two as-cast alloys.The high strength-ductility mainly comes from the formation of fine grains,nano-spaced submicron/nano precipitates,and weak texture.Moreover,it is worth noting that the YS of the two alloys can maintain above 160 MPa at elevated temperature of 250°C,significantly higher than that of AZ31 alloy(YS:45 MPa).The Zn/Ca solute segregation at grain boundaries,the improved heat resistance of matrix due to addition of RE,and the high melting points of strengthening particles(Mn,MgZn_(2),and Mg-Zn-RE/Mg-Zn-RE-Ca)are mainly responsible for the excellent high-temperature strength. 展开更多
关键词 magnesium alloys high-speed extrusion high strength high ductility solute segregation
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Towards developing Mg alloys with simultaneously improved strength and corrosion resistance via RE alloying 被引量:36
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作者 Jinshu Xie Jinghuai Zhang +5 位作者 Zihao You Shujuan Liu Kai Guan Ruizhi Wu Jun Wang Jing Feng 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2021年第1期41-56,共16页
Magnesium(Mg)alloys have received an increasing interest in the past two decades for their tremendous application potential.The strength and corrosion resistance levels of common Mg alloys are still relativity low,and... Magnesium(Mg)alloys have received an increasing interest in the past two decades for their tremendous application potential.The strength and corrosion resistance levels of common Mg alloys are still relativity low,and especially they are to be improved simultaneously.The addition of rare earth(RE)to Mg alloys is believed to be beneficial for both the strength and corrosion resistance,and some RE-modified traditional Mg alloys have been studied and some new RE-containing Mg alloys have been developed by now.However,further simultaneous improvements in both strength and anti-corrosion require a better understanding of the behavior and mechanism of RE in Mg alloys.In this review,the common influence mechanisms of RE on mechanical and anti-corrosion properties of Mg alloys are summarized,and the latest research progress of RE-containing Mg alloys with simultaneously improved strength and corrosion resistance are introduced.It is demonstrated that the research on high-strength and high corrosion resistant RE-containing Mg alloys is still immature,and some opinions and suggestions are put forward for the synergetic improvement of the strength and corrosion resistance of Mg alloys,so as to contribute to the further development of Mg alloys with higher performance. 展开更多
关键词 Mg alloy Rare earth(RE) High strength Corrosion resistance
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Repeater jamming suppression method for pulse Doppler fuze based on identity recognition and chaotic encryption 被引量:6
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作者 Jian Dai Xin-hong Hao +2 位作者 Qiang Liu Xiao-peng Yan Ping Li 《Defence Technology(防务技术)》 SCIE EI CAS CSCD 2021年第3期1002-1012,共11页
Pulse Doppler(PD) fuze is widely used in current battlefield. However, with the threat of repeater jamming, especially digital radio frequency memory technology, the deficiency in the anti-repeater jamming of a tradit... Pulse Doppler(PD) fuze is widely used in current battlefield. However, with the threat of repeater jamming, especially digital radio frequency memory technology, the deficiency in the anti-repeater jamming of a traditional PD fuze increasingly emerges. Therefore, a repeater jamming suppression method for a PD fuze based on identity(ID) recognition and chaotic encryption is proposed. Every fuze has its own ID which is encrypted with different chaotic binary sequences in every pulse period of the transmitted signal. The thumbtack-shaped ambiguity function shows a good resolution and distance cutoff characteristic. The ability of anti-repeater jamming is emphatically analyzed, and the results at different signal-to-noise ratio(SNR) show a strong anti-repeater jamming ability and range resolution that the proposed method possesses. Furthermore, the anti-repeater jamming ability is influenced by processing gain, bit error rate(BER) and correlation function. The simulation result validates the theoretical analysis, it shows the proposed method can significantly improve the anti-repeater jamming ability of a PD fuze. 展开更多
关键词 Pulse Doppler fuze ID Chaotic binary code ENCRYPTION Repeater jamming
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Simultaneously improving mechanical and anti-corrosion properties of extruded Mg-Al dilute alloy via trace Er addition 被引量:2
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作者 Zhi Zhang Jinshu Xie +5 位作者 Jinghuai Zhang Hao Dong Shujuan Liu Xiaobo Zhang Jun Wang Ruizhi Wu 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2023年第19期49-64,共16页
Simultaneously improving the mechanical properties and corrosion resistance of magnesium(Mg)alloys is a long-standing challenge to be solved in their engineering applications.In this work,we find that trace Er additio... Simultaneously improving the mechanical properties and corrosion resistance of magnesium(Mg)alloys is a long-standing challenge to be solved in their engineering applications.In this work,we find that trace Er addition can improve the mechanical and anti-corrosion properties of Mg-1.4Al-0.4Mn-0.4Ca-0.3Er(wt%,AMXE)dilute alloy synergistically,especially reducing the corrosion rate(0.75 mm y-1)by one order of magnitude compared with the reference Mg-1.4Al-0.4Mn-0.4Ca(AMX)alloy and making it comparable to that of high-purity Mg.Adding trace Er reduces the dynamic recrystallization degree and increases the strengthening phase particles,which is mainly responsible for the increase of yield strength by 42 MPa.The addition of Er promotes the formation of much less noble Al8Mn4Er with effective Fe trapping ability and induces dislocation segregation,thus dramatically reducing micro-galvanic corrosion tendency.Meanwhile,Er addition promotes the formation of a more passivation and dense corrosion film.These two factors together lead to the extremely low corrosion rate of AMXE alloy.Our findings are expected to promote the development of low alloyed high performance Mg alloys. 展开更多
关键词 Magnesium alloy Mechanics-corrosion synergy Rare earth element SKPFM
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Fast-solving method for air-to-surface guided bombs' allowable attack area
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作者 李强 夏群利 崔莹莹 《Journal of Beijing Institute of Technology》 EI CAS 2015年第2期164-168,共5页
A new method called local accurate search is put forward to calculate the allowable area for air-to-surface missiles based on the conventional methods. Comparing with traditional methods, the local accurate search met... A new method called local accurate search is put forward to calculate the allowable area for air-to-surface missiles based on the conventional methods. Comparing with traditional methods, the local accurate search method can search the area online and reduce the time of search with the required precision. Combining the traditional flight range table with a model calculation method, the new method employs the local search to fred an accurate result, which will meet the fast-calculation requirements for attacking moving targets. In this way, the missiles are adapted for the complex warfare situation. 展开更多
关键词 control technology of aircraft allowable attack area fast calculation search online
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Manipulating Precipitation Through Thermomechanical Treatment to Control Corrosion Behavior of an Al–Cu–Mg Alloy 被引量:1
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作者 Xiu-Rong Zhu Jun Wang +3 位作者 Wei-Ning Shi Xue-Bing Liu Xin-Fang Zhang Hai-Fei Zhou 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2022年第9期1547-1558,共12页
Controlling the precipitation through thermomechanical treatment is an important method to improve the corrosion resistance of Al–Cu–Mg alloys. In this study, the corrosion behaviors of Al–Cu–Mg alloys in the solu... Controlling the precipitation through thermomechanical treatment is an important method to improve the corrosion resistance of Al–Cu–Mg alloys. In this study, the corrosion behaviors of Al–Cu–Mg alloys in the solution-treated state and retrogressiontreated state under cold rolling deformation and then natural aging were investigated. In the solution-treated series alloys, the cold-rolled deformation improved the resistance to intergranular corrosion by suppressing the precipitation of the S-phase on the grain boundaries. The increased pitting potential and corrosion potential were related to the increased concentration of solute atoms within the grain interiors and the eliminated S-phase on grain boundaries. In the retrogression-treated series alloys, the 30% cold rolling deformation stimulated the growth of the S-phase and transformed the S-phase distribution from discontinuous to continuous on the grain boundaries, thereby changing the pitting corrosion to the network corrosion morphology. The precipitation of the S-phase with large dimension within the grain interiors contributed to the decreased pitting potential and corrosion potential. 展开更多
关键词 Thermomechanical treatment PRECIPITATION Intergranular corrosion Pitting corrosion
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