最新刊期
卷 ， 期 5 ， 2003
- 摘要：The compressive experiments on the foamed Al-Mg alloy foam were conducted under the strain rate ranging from 10. -3s. -1to 1 600 s. -1.The compressive stress-strain curves of the material were measured at different strain rate.The effects of strain rate on the compressive properties and energy absorption capacity of the foams were investigated.The experimental results indicate that the foamed Al-Mg alloy exhibits a significant strain rate effect in dynamic compression,the yield strength and the flow stress of the material increase with increasing strain rate;as a result,the energy absorption capacity of the foam is enhanced,while the stress created in the foam increases under dynamic compression,in comparison to static compression.关键词：Mechanical Properties;Dynamic Compression;Strain Rate Effect;Foamed Al-Mg Alloy
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发布时间：2023-12-18 - 摘要：SiCp/Al composites with high SiC particulates volume fraction were prepared in reactive centrifugal infiltration processing and its bending strength was examined. It is concluded that uniform distribution SiCp/Al composites with up to 63% high SiC particulate volume fraction can be prepared by infiltration method at low temperature and low centrifugal force for appropriate grain size proportion of particulates.The strength of the composites is greatly dependent on the size of SiC particulate and interfacial reaction. Proper interface bonding and fine SiC particulate addition favor the bending strength of the composites which is further improved as high as 519MPa due to the change of the stressed state of SiC particulates after the matrix was heat-treated.关键词：SiCp/Al Composites with Volume Fraction;Interface Reaction;Grain Size Proportion;Bending Strength
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发布时间：2023-12-18 - 摘要：Influence of strengthening treatment on the deformation of Al 2O 3/SiO 2 nano-compound ceramic core at high temperature was examined. The results showed that the strengthening treatment has great effect on the deformation of Al 2O 3/SiO 2 nano-compound ceramic core at high temperature. The deflection of the ceramic core at 1 550 ℃ for 1 h dropped from 7 mm to 1 mm before and after being strengthened. Concentration of the strengthening agent has a little effect on the deformation of the ceramic core while the strengthening times has relatively great effect.Lamellar mullite crystal microstructure appeared in the fracture surface of strengthened ceramic core, resulting in the core deformation decrease at high temperature.关键词：Strengthening Treatment;Nano-compound Ceramic Core;Deformation at High Temperature
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发布时间：2023-12-18 - 摘要：The effects of varying quantity of Al-10Sr and Al-5Ti- 0.2Cwith separate or simultaneous addition on the microstructure of ZL101 alloy at different holding time were examined by means of OM and SEM. The results showed that 0.5% addition of Al-10Sr to the alloy leads from coarse needle-like or flake-like eutectic Si morphology to fine short fibrous one and prompts the nucleation and growth of the dendritic α-Al phase with grain size varying between 100 and 250 μm. 0.2% addition of Al-5Ti-0.2C also can modify eutectic Si to some extent and generate equiaxed primary α-Al phase with about 40～70 μm. Simultaneous addition of both Al-10Sr and Al-5Ti-0.2C can refine and modify both α-Al phase and eutectic Si, which is attributed to the interactive effect of refinement and modification of Al-10Sr and Al-5Ti-0.2C.关键词：Al-10Sr Master Alloy;Al-5Ti-0.2C Master Alloy;ZL101 Alloy;Refinement;Modification
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发布时间：2023-12-18 - 摘要：There exists a large amounts of second phases in grain boundary of as cast microstructure of Al-11.8Zn-2.9Mg-2.6Cu- 1.17Lialloy containing high Zn. A lot of network phase still remain in grain boundary after homogenization at 420 ℃ for 24 h.It is difficult to dissolve the phase into the matrix by solid solution treatment at elevated temperature due to its low melting point at 490 ℃.It is found by X-rays and EDX that the phases rich in Zn and Cu is possible quasicrystal with similar structure to Al 5Li 3Cu phase.关键词：High Zn Content;Li;Phase in Grain Boundary;Quasicrystal
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发布时间：2023-12-18 - 摘要：The effects of yttrium and mischmetal on the microstructures, ageing behavior and tensile property of the Mg-Al-Zn alloy with various Al/Zn ratios were investigated. The whole as cast microstructures of the alloy were refined and RE containing Al phase was formed with RE addition. The ageing peak value was slightly raised. The time of generation of the ageing peak value was delayed owning to the addition of the yttrium and mischmetal. The tensile property of the alloy at ambient temperature was improved also.关键词：Mg-Al-Zn Alloy;Mischmetal;Ageing;RE-containing Aluminum Compound
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发布时间：2023-12-18 - 摘要：Heat treatment process for semi-solid thixoformed A356 alloy bush cap was optimized by orthogonal method under the condition of heating in resistance furnace. The microstructures and properties of the bush cap were examined. The results showed that optimum T6 treatment for semi-solid thixoformed bush cap is shown as follows: solid solution temperature 535 ℃ for 10h , ageing temperature 165 ℃ fo 5 h. Hardness of bush cap Hv 116.85. Meanwhile, precipitated phase is characterized by uniform distribution and fine microstructure. The existence of thixoformed zone results in strengthening effects to some extent. The properties of heat-treated thixoformed bush cap are superior to those in low-pressure casting and other semi-solid methods also.关键词：Semi-solid;AlSi7Mg Alloy;Thixoforming;Solid Solution Ageing;Hardness;Orthogonal Method
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发布时间：2023-12-18 - 摘要：The simulation of ductile iron hub during solidification was conducted by means of Huazhu CAE software. The casting process was optimized by the simulation and the shrinkage hole, shrinkage porosity in the ductile iron hub were eliminated successfully. The simulated results are well in agreement with that of the practical production. The numerical simulation can offer more effective reference for evaluation and improvement of technological scheme.关键词：Hub;Numerical Simulation;Ductile Iron
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发布时间：2023-12-18 - 摘要：Aimed at the features of slab aluminum alloy housing casting with large size and complicated structure, the solidification process of the casting was revealed through numerical simulation of 3D temperature field. The stress field was simulated based on semi-solid mechanical and rheological behaviors, and in turn the potential defects, including shrinkage porosity, shrinkage hole, hot tear and deformation tendency during solidification process were predicted to realize the design optimization of casting process for the castings.关键词：Large Slab;Housing Castings;Casting Process;Optimization
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发布时间：2023-12-18 - 摘要：Although in past decades, solidification microstructure simulation of alloys has been greatly improved due to the development of computer technology and accurate modeling method, the space scale characteristics of the microstructure has limited the applicable range of various modeling method. The classical CA（cellar automation） model was modified by coupling CA theories with metal solidification theories. Compared to the classical CA model, the modified model can more accurately simulate the microstructure and morphology transformation of the grains taking account into the effects of solute redistribution and diffusion in the melt,interface anisotropy and unstituent and curvature undercoolings on the local undercooling of dendritic tip and interface equilibrium temperature.关键词：Microstructure Modeling;Cellar Automation Model;Macro-Micro-Coupled Model
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发布时间：2023-12-18 - 摘要：The BP neural network model（ANN） for age hardening process was established by introducing modified Levenberg-Marqurdt algorithm based on the learning of sample collection of the ANN to model the non-linear relation of hardness and electric conductivity of the Cu-Cr-Zr alloy as a function of ageing temperature and time. The results showed that the BP neural network could fully explore the domain knowledge in the sample collection to effectively predict and analyze the properties of the Cu-Cr-Zr alloy.关键词：Cu-Cr-Zr Alloy;Age Hardening;ANN;Levenberg-Marquardt Algorithm
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发布时间：2023-12-18 - 摘要：Based on the imported key equipments from foreign countries in lost foam casting, we in cooperation with Anhui Fork-Lift Group have engaged in research and development of foam tools making since the year 1998. Over the years, 8 sets of different foam tools for housing casting have been developed to meet our own demands and to supply other enterprise with the foam tools for housing castings at home and abroad, which enabled the equipments on line to full loading factor.关键词：Foam Tools;Housing Casting;Lost Foam Casting
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发布时间：2023-12-18 -
- 摘要：Aimed at the features of various defects encountered in trial-production of cast Mg alloy housing, the corresponding countermeasures were given to produce qualified casting through analyzing the formation mechanism and influencing factors. The experiment showed that the key processing parameters of Mg alloy in squeezing casting depended on pouring temperature, mould temperature, specific pressure, initially pressurized time after pouring and holding pressure time. The proper processing parameters were specified as follows: pouring temperature of 690～720 ℃, mould temperature of 200～250 ℃, initially pressurized time of 3～5 s after pouring and holding pressure time of 10～20 s.关键词：Squeezing Casting;Mg Alloy;Defects
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发布时间：2023-12-18 - 摘要：The technological principle, features and merits of vacuum pressurized casting were expounded in detail. Based on developing tendency of large, complex, thin-walled,high lightness and integrative aluminum alloy castings, the availability of the casting technique was analyzed and the corresponding technical counter-measures were given.关键词：Vacuum Pouring;Pressurized Crystallization;Al Alloy Casting
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发布时间：2023-12-18 -
- 摘要：Proper decrease in pouring temperature and increase in shell mold temperature are helpful to preventing hot tear. Some effective measures to prevent hot tear,including avoidance of liquid metal to impact mold cavity and of casting-sprue-runner to form rectangular structure, were proposed during design of gating system. The measures to prevent casting deformation is shown as follows: decreasing cooling rate of thin-walled location in casting, changing assembly direction of wax pattern to overcome the deformation owning to the gravity, possibly setting single ingate, adding reinforced rib, using reverse deflection and deformation transfer.
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发布时间：2023-12-18 -
- 摘要：The key issues for bronze gnomon casting with integrated and clear surface in investment casting in plaster mold involves to prevent large plate from deformation and to ensure full mold filling. Reinforced rib setting in the black surface of large plate of the casting and tilt pouring method are preferable to gnomon casting.关键词：Gnomon;Investment Casting;Bronze Art Casting
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发布时间：2023-12-18 -
- 摘要：Although there are superiority to surface roughness and dimension accuracy as well as elimination of some casting defects of the low alloying steel castings in lost foam casting compared with in sodium solicate sand casting, there exists carburization and slag inclusion in the castings. These defects can be reduced or elimination by adjusting proportion of the raw material charge or adopting other casting technologies and heat treatment.关键词：Expandable Pattern;Low Alloying Steel;Bucket Tooth
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发布时间：2023-12-18 -
- 摘要：Thick-walled ZG1Cr18Ni9Ti stainless steel pipe with small caliber of 80 mm external diameter and 45 mm internal diameter and 1 000 mm length is made in centrifugal casting to substitute for steel bar to make hubcap with corrosion resistance. The casting pipe meets technological requirements of sealing hubcap with corrosion resistance.关键词：Centrifugal Casting;Thick-walled Casting Pipe;Varying Rate Pouring;Gas Release
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发布时间：2023-12-18 - 摘要：An attention should be carefully paid to a lot of casting aspects,concerning castability,correction of technic parameters with respect to casting specification, determination of reasonable gating system and mold filling-feeding,to warrant the realiability of molding tool design and to obtain highly qualified Al-piston in casting machine.ntthere关键词：Aluminum Piston;Permanent Mold;Castability;Gating System
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发布时间：2023-12-18 -
Grain Refinement and Fading Behavior of Directly Electrolytic Aluminum Alloy Containing Low Titanium
摘要：The effects of Ti content in directly electrolytic low Ti-Al alloy with 0.1%～0.3% Ti on the grain refinement and on the fading behavior during melt holding period were investigated, compared to the traditional smelting method correlating Ti-Al master alloy with pure aluminum. The results showed that for both of the alloys grains were obviously refined to same extent with increase in Ti content, and the grain sizes were coarsened to some extent due to evident fading of Ti effect during melt holding period. It seems that the fading resistance of the electrolytic alloy is superior to that of the conventionally smelting alloy, especially for the alloy containing 0.1%～0.2% Ti.关键词：Electrolytic Low Ti Aluminum Alloy;Grain Refinement;Fading- 2
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发布时间：2023-12-18 - 摘要：The effects of interaction between precipitation and recrystallization on the properties of the Cu-Ni-Si-Cr alloy during ageing were examined. The results showed that the deformation resulted in finer and more disperse precipitated phase during ageing, and in turn the precipitation retards the nucleation and growth of the recrystallization.The precipitated phase was of more disperse distribution resulting from rapidly coarsening or re-dissolving precipitated phase in the front of grain boundaries and from re-precipitating in the recrystallized region during nucleation and growth of the recrystallization.关键词：Cu-Ni-Si-Cr Alloy;Ageing Precipitation;Recrystallization
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发布时间：2023-12-18 -
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