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Effect of particle size distribution on the microstructure,texture,and mechanical properties of Al–Mg–Si–Cu alloy

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International Journal of Minerals,Metallurgy and Materials 2018年第8期25卷 957-966页

作者： Xiao-feng Wang Ming-xing Guo Cun-qiang Ma Jian-bin Chen Ji-shan Zhang Lin-zhong Zhuang The Faculty of mechanical Engineering and Mechanics Ningbo UniversityNingbo 315211China State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing 100083China Capital Aerospace Machinery Company Beijing 100076China

The effect of particle size distribution on the microstructure,texture,and mechanical properties of Al–Mg–Si–Cu alloy was investigated on the basis of the mechanical properties,microstructure,and texture of the *** results show that the particle size distribution influences the microstructure and the final mechanical properties but only slightly influences the recrystallization *** the pre-aging treatment and natural aging treatment(T4 P treatment),in contrast to the sheet with a uniform particle size distribution,the sheet with a bimodal particle size distribution of large constituent particles and small dispersoids exhibits higher strength and a somewhat lower plastic strain ratio(r) and strain hardening exponent(n).After solution treatment,the sheet with a bimodal particle size distribution of large constituent particles and small dispersoids possesses a finer and slightly elongated grain structure compared with the sheet with a uniform particle size ***,they possess almost identical weak recrystallization textures,and their textures are dominated by CubeND {001} and P {011} orientations.

关键词： Al–Mg–Si–Cu alloy microstructure texture particle mechanical property

Phase-dependent double optomechanically induced transparency in a hybrid optomechanical cavity system with coherently mechanical driving

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Chinese Physics B 2019年第7期28卷 233-242页

作者： Shi-Chao Wu Li-Guo Qin Jian Lu Zhong-Yang Wang Shanghai Advanced Research Institute Chinese Academy of Sciences Shanghai 201210 China School of Mathematics Physics and Statistics Shanghai University Of Engineering Science Shanghai 201620 China University of Chinese Academy of Sciences Beijing 100049 China

We propose a scheme that can generate tunable double optomechanically induced transparency in a hybrid optomechanical cavity *** this system, the mechanical resonator of the optomechanical cavity is coupled with an additional mechanical resonator and the additional mechanical resonator can be driven by a weak external coherently mechanical driving *** show that both the intensity and the phase of the external mechanical driving field can control the propagation of the probe field, including changing the transmission spectrum from double windows to a *** study also provides an effective way to generate intensity-controllable, narrow-bandwidth transmission spectra, with the probe field modulated from excessive opacity to remarkable amplification.

关键词： double optomechanically induced transparency hybrid optomechanical cavity system pump– probe spectroscopy mechanical driving

Texture evolution and mechanical properties of Al-Mg-Si alloys at different intermediate annealing temperatures

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Rare Metals 2019年第10期38卷 937-945页

作者： Yong Li Qi-Pan Wang Guan-Jun Gao Jia-Dong Li Zhao-Dong Wang Guang-Ming Xu State Key Laboratory of Rolling and Automation Northeastern University

Intermediate annealing treatment produces different effects on the state of particles in Al-Mg-Si alloy sheets,thereby affecting their recrystallization textures and *** improve the formability of the sheets,the effects of different intermediate annealing temperatures on the texture evolution and mechanical properties of these sheets for automotive applications were studied using optical microscope(OM),scanning electron microscope(SEM) and tensile *** results reveal that intermediate annealing temperature has a significant influence on the recrystallization textures and average plastic strain ratio(r).After solution treatment,all the alloy sheets possess similar recrystallization texture components comprising of cubeND {100} and P {011} orientations,whereas a characteristic strong cube-oriented {100} texture is observed only in the alloy annealed at a temperature of 380℃.However,in comparison with the alloy not annealed,and the alloy annealed at 550℃,the alloy annealed at 380℃ possesses a lower average r ***,the relationship between textures and r value was analyzed by using the Taylor full constraints model in this study.

关键词： Al-Mg-Si alloys Intermediate annealing Texture evolution mechanical property

Research on the Glass Transition Temperature and mechanical Properties of Poly(vinyl chloride)/Dioctyl Phthalate (PVC/DOP) Blends by Molecular Dynamics Simulations

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Chinese Journal of Polymer Science 2019年第8期37卷 834-840页

作者： Jing Li Shao-Hua Jin Guan-Chao Lan Zi-Shuai Xu Lu-Ting Wang Na Wang Li-Jie Li School of Materials Science and Engineering Beijing Institute of Technology Beijing 100081 China Research Institute of Gansu Yin Guang Chemical Industry Group Co.Ltd Baiyin 730900 China

To effectively improve the performance and expand the applications of polymers, molecular dynamics(MD) simulations with the COMPASS force field have been applied to predict the miscibility, glass transition temperature(Tg), and mechanical properties of poly(vinyl chloride)/dioctyl phthalate(PVC/DOP) blends. The solubility parameter values obtained are in good agreement with the reference data and the little difference(|Δδ|mechanical properties results indicate that the values of Young’s modulus(E), bulk modulus(K), and shear modulus(G) decrease with the addition of DOP, demonstrating that the rigidity of material is weakened and the ductility is improved. The mechanical properties can also be effectively improved by increasing the temperature, which may provide a more flexible mixture, with lower E, K, G but an increased ductility.

关键词： Poly(vinyl chloride)(PVC) Dioctyl phthalate (DOP) MD simulations Glass transition temperature mechanical properties

Effects of gadolinium addition on the microstructure and mechanical properties of Mg–9Al alloy

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International Journal of Minerals,Metallurgy and Materials 2017年第8期24卷 901-908页

作者： Lavish Kumar Singh Alok Bhadauria Amirthalingam Srinivasan Uma Thanu Subramonia Pillai Bellambettu Chandrasekhara Pai Department of Metallurgical and Materials Engineering Indian Institute of Technology Kharagpur Materials Science and Technology Division National Institute for Interdisciplinary Science and Technology

This research aims to study the significance of Gd addition(0wt%–2wt%) on the microstructure and mechanical properties of Mg–9Al alloy. The effect of Gd addition on the microstructure was investigated via X-ray diffraction(XRD), optical microscopy, scanning electron microscopy(SEM), and transmission electron microscopy(TEM). The Mg–9Al alloy contained two phases, α-Mg and β-Mg_(17)Al_(12). Alloying with Gd led to the emergence of a new rectangular-shaped phase, Al_2Gd. The grain size also decreased marginally upon Gd addition. The ultimate tensile strength and microhardness of Mg–9Al alloy increased by 23% and 19%, respectively, upon 1.5wt% Gd addition. We observed that, although Mg–9Al–2.0Gd alloy exhibited the smallest grain size(181 μm) and the highest dislocation density(5.1 × 10^(10) m^(-2)) among the investigated compositions, the Mg–9Al–1.5Gd alloy displayed the best mechanical properties. This anomalous behavior was observed because the Al_2Gd phase was uniformly distributed and present in abundance in Mg–9Al–1.5Gd alloy, whereas it was coarsened and asymmetrically conglomerated in Mg–9Al–2.0Gd.

关键词： magnesium rare earth alloying gadolinium microstructure mechanical properties

Microstructure and mechanical properties of novel Al-Y-Sc alloys with high thermal stability and electrical conductivity

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Journal of Materials Science & Technology 2020年第1期36卷 1-6页

作者： A.V.Pozdniakov R.Yu.Barkov NUST"MISiS" Leninskiy ave.4119049MoscowRussia

The microstructure and mechanical properties of novel Al-Y-Sc alloys with high thermal stability and electrical conductivity were *** Al3 Y-phase particles of size 100-200 nm were detected in the as-cast microstructure of the ***3 Y-phase particles provided a higher hardness to as cast alloys than homogenized alloys in the temperature range of 370-440℃.L12 precipitates of the Al3(ScxYy) phase were nucleated homogenously within the aluminium matrix and heterogeneously on the dislocations during annealing at 400℃.The average size of the L12 precipitates was 11±2 nm after annealing for 1 h,and 25-30 nm after annealing for 5 h,which led to a decrease in the hardness of the Al-0.2 Y-0.2 Sc alloy to15 *** recrystallization temperature exceeded 350℃and 450℃for the Al-0.2 Y-0.05 Sc and Al-0.2 Y-0.2 Sc alloys,*** investigated alloys demonstrated good thermal stability of the hardness and tensile properties after annealing the rolled alloys at 200 and 300℃,due to fixing of the dislocations and grain boundaries by L12 precipitates and eutectic Al3 Y-phase *** good combination of strength,plasticity,and electrical conductivity of the investigated Al-0.2 Y-0.2 Sc alloys make it a promising candidate for electrical *** alloys exhibited a yield stress of 177-183 MPa,ultimate tensile stress of 199-202 MPa,elongation of 15.2-15.8%,and electrical conductivity of 60.8%-61.5% IACS.

关键词： Aluminium alloys Scandium Yttrium Recrystallization mechanical properties Electrical conductivity

Ni-P-SiC composite coatings electroplated on carbon steel assisted by mechanical attrition

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Acta Metallurgica Sinica(English Letters) 2010年第2期23卷 137-146页

作者： Zhaoxia PING Guoan CHENG Yedong HE Key Laboratory of Beam Technology and Material Modification of Ministry of Education College of Nuclear Science and Technology Beijing Normal University Beijing 100875 China Beijing Key Laboratory for Corrosion Erosion and Surface Technology University of Science and Technology Beijing Beijing 100083 China

Ni-P-SiC composite coatings were electroplated on carbon steel substrate assisted by mechanical attrition （MA）. The MA action was conducted by dispersing glass balls on the cathodic surface, vibrating in the horizontal direction. The experimental results show that, under the assistant of MA action, the adhesion of Ni-P-SiC coating on the steel substrate can be improved effectively, and the Ni-P-SiC coatings exhibit a crystallized structure and Ni-P matrix can combine tightly with SiC particles, and the hardness and corrosion resistance of these coatings increase markedly. During heat treatment, the defects produced in conventional Ni-P-SiC composite coatings can be avoided assisted by MA action. Both of the wear of these coatings can be improved further.

关键词： Ni-P-SiC composite coating attrition resistance and corrosion resistance Electroplating mechanical

Microstructure and mechanical properties of SiC-particle-strengthening tri-metal Al/Cu/Ni composite produced by accumulative roll bonding process

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International Journal of Minerals,Metallurgy and Materials 2018年第3期25卷 357-364页

作者： Moslem Tayyebi Beitallah Eghbali Department of Material Engineering Sahand University of Technology

In this study, a multilayer Al/Ni/Cu composite reinforced with Si C particles was produced using an accumulative roll bonding(ARB) process with different cycles. The microstructure and mechanical properties of this composite were investigated using optical and scanning microscopy and hardness and tensile testing. The results show that by increasing the applied strain, the Al/Ni/Cu multilayer composite converted from layer features to near a particle-strengthening characteristic. After the fifth ARB cycle, a composite with a uniform distribution of reinforcements(Cu, Ni, and SiC) was fabricated. The tensile strength of the composite increased from the initial sandwich structure to the first ARB cycle and then decreased from the first to the third ARB cycle. Upon reaching five ARB cycles, the tensile strength of the composite increased again. The variation in the elongation of the composite exhibited a tendency similar to that of its tensile strength. It is observed that with increasing strain, the microhardness values of the Al, Cu, and Ni layers increased, and that the dominant fracture mechanisms of Al and Cu were dimple formation and ductile fracture. In contrast, brittle fracture in specific plains was the main characteristic of Ni fractures.

关键词： accumulative roll bonding Al/Ni/Cu/SiC composite silicon carbide particles microstructure mechanical properties

Microstructure and mechanical Properties of AZ31 Mg Alloy Fabricated by Pre-compression and Frustum Shearing Extrusion

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Acta Metallurgica Sinica(English Letters) 2019年第2期32卷 235-244页

作者： Kun Sheng Li-Wei Lu Yao Xiang Min Ma Zhong-Chang Wang Hunan Provincial Key Laboratory of High Efficiency and Precision Machining of Difficult-to-Cut Material Hunan University of Science and Technology College of Materials Science and Engineering Hunan University of Science and Technology Department of Quantum Materials Science and Technology International Iberian Nanotechnology Laboratory(INL)

The AZ31 Mg alloys were processed by 6% pre-compression and frustum shearing extrusion at various temperatures, and the microstructure, texture and mechanical properties of the resulting alloys are systematically investigated. The results show that the grain size monotonically increases from 6.4 to 12.6 lm and the texture intensity increases from 6.7 to 9.6with the increase in the extrusion temperature. The combining effect of the pre-twinning and the frustum shearing deformation is found to contribute to the development of the weak basal texture in Mg alloys. The Mg alloy sheet produced at the extrusion temperature of 563 K exhibits excellent mechanical properties. The yield strength, ultimate tensile strength and elongation for the extruded alloys are 189.6 MPa, 288.4 MPa and 24.9%, respectively. Such improved mechanical properties are comparable or even superior to those of the alloys subjected to other deformation techniques, rendering the pre-compression and frustum shearing extrusion a promising way for further tailoring properties of Mg alloys.

关键词： AZ31 magnesium alloy Frustum shearing extrusion Microstructure mechanical property Dynamic recrystallization