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| 1 | Effects of Ce and Sb on the microstructure and properties of AZ91D magnesium alloy prepared by the EPC process显示文摘The effects of small amounts of cerium and antimony additions on the microstructure and the mechanical properties of AZ91D(Mg-9Al-Zn) based alloy were researched via the expendable pattern casting(EPC) process.The results show that the microstructure is obviously refined and the tensile strength of the AZ91D based alloy at ambient temperature is significantly improved.When compared to AZ91D,the AZ91D-1.0%Ce-0.4%Sb alloy has higher ultimate tensile strength and elongation.Its ultimate tensile strength and elongation are enhanced by 39% and 47%,respectively.The morphology of the tensile fracture of the AZ91D-1.0%Ce-0.4%Sb alloy has more characteristics of quasi-cleavage.This indicates that it has had a larger plastic deformation before failure.The tensile strength and elongation decrease with the increase of Ce and Sb contents because of the coarsening and volume increase of CeSb and Al11Ce3 phases. | LI Jiqiang DONG Xuanpu FAN Zitian WANG Yuanqing | 2008 | Rare Metals2008，27，1： | 19 |
| 2 | Influence of mechanical vibration on the solidification of a lost foam cast 356 alloy显示文摘Mechanical vibration was applied to the solidification of a lost foam cast(LFC) 356 aluminum alloy.Effects of mechanical vibration,with different peak acceleration,on the size and morphology of α-Al phase,and also on the mechanical properties of the castings were studied.Results indicated that α-Al dendrites gradually grow into equiaxed grains as the peak acceleration of vibration is increased.When the peak acceleration is between about 1 to 4 g,α-Al phase distribution is uniform and is refined obviously.α-Al dendrites are reduced and the mechanical properties of the castings are improved significantly when compared to those of the castings that are produced without vibration.However,when the peak acceleration is higher than 4 g,strong vibration will lead to defects formation,such as sand adhesion,while the amount and size of pores will be increased.And due to the turbulent flow that caused by strong vibration,the chance of forming large pores in the matrix has been increased significantly.The increase in defects will result in the deterioration of mechanical properties. | Zhao Zhong Fan Zitian Dong Xuanpu Tang Bo Pan Di Li Jiqiang | 2010 | China Foundry2010，7，1： | 7 |
| 3 | Study on typical hole defects in AZ91D magnesium alloy prepared by low pressure lost foam casting显示文摘The hole defects can easily occur in magnesium alloy castings that are prepared by low pressure lost foam casting(LP-LFC)process when the process parameters such as vacuum,pouring temperature and f illing velocity are not properly selected.In this study,the forming mechanism of the hole defects in AZ91D magnesium castings by LP-LFC process was investigated.The shape,location and surface appearance of the hole defects were observed using optical microscopy and scanning electron microscopy,and the chemical composition on the surface of the holes was analyzed using energy spectrometer.The result indicates that there are two types of hole defects,i.e.,the pyrolysis products related hole defects,including concentrative hole and blow hole defects,and slag related hole defects.The concentrative hole and the blow-hole defects were formed either by the liquidEPS degradation products entrapped in the molten metal under the condition that the pouring temperature is equal to or lower than 730℃,or by the hindered transport of EPS pyrolysis products.Some irregular shape hole defects were caused by slag or by coating slough entrapment when the pouring temperature is equal to 750℃and the f illing velocity is equal to or greater than 100 mm·s-1.To reduce or eliminate the hole defects,the vacuum and f illing velocity must be properly chosen to ensure that the metal front prof ile exhibits convex shape and in laminar current state,and the pouring temperature should be just high enough to ensure that the molten melt has adequate heat energy to complete the foam pyrolysis and to fully occupy the mould.For AZ91D magnesium castings in this study,the parameters should be 730℃pouring temperature,0.02-0.03 MPa vacuum and 80mm·s-1f illing velocity. | Li Jiqiang Zhao zhong Fan Zitian Dong Xuanpu Shi Hualiang | 2013 | China Foundry2013，10，4： | 5 |
| 4 | Dry reusing and wet reclaiming of used sodium silicate sand显示文摘Based on the characteristics of used sodium silicate sand and the different use requirements for recycled sand, 'dry reusing and wet reclaiming of used sodium silicate sand' is considered as the most suitable technique for the used sand. When the recycled sand is used as support sand, the used sand is only reused by dry process including breaking, screening, dust-removal, etc., and it is not necessary that the used sand is reclaimed with strongly rubbing and scraping method, but when the recycled sand is used as facing sand (or single sand), the used sand must be reclaimed by wet method for higher removal rate of the residual binders. The characteristics and the properties of the dry reused sand are compared with the wet reclaimed sand after combining the different use requirements of support sand and facing sand (or single sand), and above the most adaptive scheme has also been validated. | Zitian FAN Naiyu HUANG Huafang WANG Xuanpu DONG | 2005 | China Foundry2005，2，1： | 4 |
| 5 | Study on microstructure and properties of Mg-alloy surface alloying layer fabricated by EPC显示文摘AZ91D surface alloying was investigated through evaporative pattern casting(EPC) technology.Aluminum powder(0.074 to 0.104 mm) was used as the alloying element in the experiment.An alloying coating with excellent properties was fabricated,which mainly consisted of adhesive,co-solvent,suspending agent and other ingredients according to desired proportion.Mg-alloy melt was poured under certain temperature and the degree of negative pressure.The microstructure of the surface layer was examined by means of scanning electron microscopy.It has been found that a large volume fraction of network new phases were formed on the Mg-alloy surface,the thickness of the alloying surface layer increased with the alloying coating increasing from 0.3 mm to 0.5 mm,and the microstructure became compact.Energy dispersive X-ray(EDX) analysis was used to determine the chemical composition of the new phases.It showed that the new phases mainly consist of β-Mg17Al12,in addition to a small quantity of inter-metallic compounds and oxides.A micro-hardness test and a corrosion experiment to simulate the effect of sea water were performed.The result indicated that the highest micro-hardness of the surface reaches three times that of the matrix.The corrosion rate of alloying samples declines to about a fifth of that of the as-cast AZ91D specimen. | Chen Dongfeng Dong Xuanpu Fan Zitian Xu Qian Zhang Xiong | 2010 | China Foundry2010，7，1： | 3 |
| 6 | Newly developed vacuum differential pressure casting of thin-walled complicated Al-alloy castings显示文摘The newly designed vacuum differential pressure casting (VDPC) unit was introduced, by which the capabilityof the VDPC process to produce thin-walled complicated Al-alloy castings, that are free from oxides, gas pore andshrinkage cavity and thus enhance overall part quality, was studied. Experimental results were compared with those oftraditional gravity pouring and vacuum suction casting. The first series of experiments were focused on investigating thecastability of thin section Al-alloy casting. In the second series of experiments the metallographic evidence, castingstrength and soundness were examined. Finally, case studies of very interesting thin walled complicated casting applicationswere described. The advantages of the described technique have made possible to produce thin walled complicatedAl-alloy casting (up to a section thickness of 1 mm), which is not practical for gravity pouring and vacuum suction casting. | Xuanpu DONG Naiyu HUANG Shushen WU | 2005 | China Foundry2005，2，2： | 2 |
| 7 | Fabrication oftheological material by rotating gas bubble stirring显示文摘 | Zhang Lei Dong Xuanpu Wang Wenjun | 2011 | Advanced Materials Research2011，，： | 1 |
| 8 | Effects of heat treatment on microstructure, mechanical properties and damping capacity of Mg–Zn–Y–Zr alloy显示文摘 | Bangsong Yan Xuanpu Dong Rong Ma Shuqun Chen Zhang Pan Hongjiang Ling | 2014 | Materials Science & Engineering A2014，，： | 1 |
| 9 | Rapid precision casting for complex thin-walled aluminum alloy parts显示文摘1 .IntroCtion Seleetive Laser Sintering(SLS)15 an imPortant field ofRaPid PrototyPing(RP),due to its caPability ofProeessinga very wide range ofmaterialsinadireetway.AtPresent,most of sintering materials are nonmetallie, | ~*Xuanpu DONG,Naiyu HUANG, Zitian FAN, Hongjun LIU (School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, Hubei, P. R. China) | 2004 | China Foundry2004，1，2： | 0 |
| 10 | An investigation on bonding interface microstructure of ceramic coating prepared on AZ91D by evaporated pattern casting technique显示文摘PbO-ZnO-Na2O ceramic coating was fabricated on the AZ91D Mg-alloy substrate surface by using of evaporated pattern casting(EPC) process.The ceramic coating was characterized through scanning electron microscopy(SEM) observation,energy dispersive X-ray spectrometer(EDS) and so on.The research was emphasized on the formation process of ceramic coating and the interface bonding conditions between ceramic coating and the substrate.Results show that the glass powder(PbO-ZnO-Na2O) melts when contacts with the high temperature liquid metal,and solidifies on the surface of the substrate with the decrease of temperature.Therefore,the ceramic coating was successfully prepared with the formation of the bonding interface with the substrate.Beside the influence of coating layer thickness,the vacuum level was also investigated.Further analysis indicates that oxide inclusions and decomposition products of foam pattern had a significant effect on the bonding interface.To obtain a good bonding interface between the ceramic coating and the substrate,the metal liquid oxidation and inclusions must be decreased and the decomposition products of foam pattern should be exhausted from the EPC coating completely. | Chen Dongfeng Dong Xuanpu Fan Zitian Ma Rong | 2011 | China Foundry2011，8，2： | 0 |
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