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| 1 | Corrosion Behavior of Extruded near Eutectic Al—Si—Mg and 6063 Alloys显示文摘In this work,a comparison study on corrosion behavior of extruded near eutectic Al—12.3%Si—0.26%Mg and 6063 alloys has been carried out by mass loss test in 4%H2SO4 aqueous solution in the open air and potentiodynamic polarization test in 3.5 wt.%NaCI aqueous solution.Results indicate that the corrosion resistance of the near eutectic Al—Si—Mg alloy is less than that of 6063 alloy.Macro/microscopy and scanning electron microscopy results clearly show the difference of the corrosion progress of these two alloys in 4%H2SO4 aqueous solution.The corrosion type of 6063 alloy is pitting corrosion.The Mg2Si and AlFeSi particles and surface defects act as nucleation sites for pitting,and the amount and distribution of them have a significant effect on the pitting behavior.For the near eutectic alloy,there are two types of corrosion cells. One is between the extruded primaryα-AI and the eutectic,the other is between the eutectic Al and eutectic Si particles.Combination of these two types of corrosion cells leads to a lower corrosion resistance,a higher mass loss of the near eutectic alloy compared with 6063 alloy,and the formation of the paralleling corroded grooves. | Yuna Wu Hengcheng Liao | 2013 | Journal of Materials Science & Technology2013，29，4： | 8 |
| 2 | Effect of Si Content on Dynamic Recrystallization of Al-Si-Mg Alloys During Hot Extrusion显示文摘By using electron backscatter diffraction(EBSD) and transmission electron microscopy(TEM), the effect of Si content on microstructure characteristics of three as-extruded Ale SieM g alloys was investigated. Results showed that the density of coarse Si particles played a critical role in dynamic recrystallization. Dynamic recrystallization rarely occurred in S1 alloy with less Si content; however, it happened in the Si-rich zones in S2 alloy with a medium Si content. And a mature recrystallization was observed in S3 alloy with high Si content. Although deformation was carried out at high temperature, particle-stimulated dynamic recrystallization occurred in Si-rich zones. | Yuna Wu Hengcheng Liao Jian Yang Kexin Zhou | 2014 | Journal of Materials Science & Technology2014，30，12： | 4 |
| 3 | In-situ observation of porosity formation during directional solidification of Al-Si casting alloys显示文摘In-situ observation of porosity formation during directional solidification of two Al-Si alloys (7%Si and 13%Si) was made by using of micro-focus X-ray imaging.In both alloys,small spherical pores initially form in the melt far away from the eutectic solid-liquid (S/L) interface and then grow and coagulate during solidification.Some pores can float and escape from the solidifying melt front at a relatively high velocity.At the end of solidification,the remaining pores maintain spherical morphology in the near eutectic alloy but become irregular in the hypoeutectic alloy.This is attributed to different solidification modes and aluminum dendrite interactions between the two alloys.The mechanism of the porosity formation is briefly discussed in this paper. | Zhao Lei Liao Hengcheng Pan Ye Wang Qigui Sun Guoxiong | 2011 | China Foundry2011，8，1： | 2 |
| 4 | Investigation on corrosion behaviour of asextruded near eutectic Al-Si-Mg alloy by neutral salt spray test显示文摘In order to provide scientific basis for advanced applications of near eutectic Al-Si-Mg alloys as architectural prof iles,a comparative study on the corrosion resistance of an as-extruded near eutectic Al-Si-Mg alloy and AA6063 aluminium alloy was carried out by means of neutral salt spray test.The corroded surfaces of the alloys were examined with optical microscopy and scanning electron microscope(SEM).Results show that the corrosion type of these two alloys is pitting corrosion.The number of corrosion pits in the AA6063 aluminium alloy is more than that in the near eutectic Al-Si-Mg alloy,but the pits in the latter alloy are much larger and deeper.Because the relatively low polarization resistance of the near eutectic alloy leads to poorer repassivation ability,autocatalytic acidif ication occurs once a pit forms.Thus,occluded corrosion cells are developed in this alloy. | Wu Yuna Liao Hengcheng Yang Jian | 2013 | China Foundry2013，10，4： | 2 |
| 5 | Investigation on the effect of Al-5Ti-1B master alloy on the near-eutectic Al-Si casting alloys modified with strontium显示文摘 | LIAO Hengcheng SUN Yu SUN Guoxiong | 2002 | J Mater Sci2002，37，16： | 1 |
| 6 | Mutual poisoning effect between Sr and B in Al-Si casting alloys 显示文摘 | LIAO Hengcheng SUN Guoxiong | 2003 | Script Materialia2003，48，8： | 1 |
| 7 | Restraining effect of strontium on the crystallization of Mg2Si phaseduring solidification in Al-Si-Mg casting alloys and mechanisms 显示文摘 | Liao Hengcheng Sun Yu Sun Guoxiong | 2003 | Materials Science and Engineering2003，358，： | 1 |
| 8 | Correlation between mechanical properties and amount of dendritic α-Al phase in as-cast near-eutectic Al–11.6% Si alloys modified with strontium显示文摘 | Hengcheng Liao Yu Sun Guoxiong Sun | 2002 | Materials Science & Engineering A2002，，1： | 1 |
| 9 | Attenuation of reperfusion injury by renal ischemic postconditioning: The role of NO显示文摘 | Xiuheng Liu Hui Chen Bingyan Zhan Bianzhi Xing Jiangqiao Zhou Hengcheng Zhu Zhiyuan Chen | 2007 | Biochemical and Biophysical Research Communications2007，，3： | 1 |
| 10 | Eutectic Solidification in Al-13.0%Si Alloys with Combined Addition of Strontium and Boron显示文摘The influence of addition of boron(B) on eutectic solidification in a near-eutectic Al-13.0%Si alloy modified with strontium(Sr) was investigated using thermal analysis and macro/microstructure observation.Addition of B in the Sr-modified alloy leads to a considerable increase in nucleation temperature(TN,the minimum temperature prior to recalescence(TM) and growth temperature(TG).In the Sr-modified alloy,nucleation of eutectic might originate at the heterogeneous sites on the mold wall or in the melt near the wall,and eutectic solidification proceeds gradually towards the center,controlled by undercooling of melt.However,with addition of B in the Sr-modified alloy,undercooling required for eutectic nucleation became small,and hence eutectic solidification might occur almost simultaneously within whole casting,controlled by amount of heterogeneous sites.With excessive addition of B in the Sr-modified alloy,nucleation of eutectic grains was explosive within the whole casting and the power of Sr on eutectic solidification was completely poisoned. | Hengcheng Liao,Ke Ding,Juanjuan Bi,Min Zhang,Huipin Wang and Lei Zhao School of Materials Science and Engineering,Southeast University,Nanjing 211198,China Jiangsu Key Laboratory for Advanced Metallic Materials,Nanjing 211189,China | 2009 | Journal of Materials Science & Technology2009，25，4： | 1 |
| 11 | Effect of Sr content on porosity formation in directionally solidified Al-12.3wt.%Si alloy显示文摘The influence of Sr addition on pore formation in directionally solidified Al-12.3wt.% alloy was investigated using X-ray detection, optical microscope, and SEM-EDX. Results indicate that addition of Sr significantly increases the number density and volume fraction of porosity. The considerable rise in volume fraction of porosity is attributed to the remarkable increase in the numbers of pores formed. It is found that Sr solute in liquid Al-Si alloy can diffuse into the oxide inclusions to form loose oxide aggregations which have more activity as the nucleation sites for porosity. Adding more Sr considerably increases the numbers of active nucleation sites. There is an obvious fluctuation of pore number density during steady state solidification, which is believed to be related to a fluctuation of local hydrogen supersaturation induced by the competition of pore nucleation and growth for hydrogen solute supplement. | Liao Hengcheng Wu Yuna Fan Ran Wang Qigui | 2014 | China Foundry2014，11，5： | 1 |
| 12 | Effect of strontium and solidification rate on eutectic grain structure in an Al-13 wt% Si alloy显示文摘The influence of strontium addition and solidification rate on eutectic grain structure in a near-eutectic Al-Si alloy was investigated. The characteristic temperature of eutectic nucleation (TN),minimum temperature prior to recalescence (TM),and the growth temperature (TG) during cooling were determined by quantitative thermal analysis. All characteristic temperatures were found to decrease continuously with increasing Sr content and solidification rate. Microstructural analysis also revealed that the eutectic grain size decreases with increasing Sr content and solidi fication rate. Such eutectic grain refinement is attributed to the increased actual under-cooling ahead of the liquid/solid interface during solidification. | Liao Hengcheng Bi Juanjuan Zhang Min Ding Ke Jiang Yunfeng Cai Mingdong | 2009 | China Foundry2009，6，3： | 1 |
| 13 | Hot deformation behavior and processing map of Al–Si–Mg alloys containing different amount of silicon based on Gleebe-3500 hot compression simulation显示文摘 | Hengcheng Liao Yuna Wu Kexin Zhou Jian Yang | 2015 | Materials and Design2015，，： | 1 |
| 14 | Massive Si Phase and Its Growth Mechanism in Al-Si Casting Alloy显示文摘Optical microscope and scanning electron microscope were used to observe the microstructure of the Al-11.6% Si and Al-11.6%Si-0.4%Mg alloys and the morphology of the massive silicon particles. It is found that the massive silicon phase, observed in the unfully modified alloys with 0.010%Sr, disappears completely in the alloys fully modified with 0.020%Sr. The serrations and reentrant edges shown in the massive silicon particles with the conventional casting indicate that the TPRE mechanism plays an important role in the growth of the massive silicon phase. The ripples and steps suggest that the “lateral microscopic growth” may be another operating mechanism. | Hengcheng LIAO and Guoxiong SUNDepaxtment of Materials Science and Engineering, Southeast University, Nanjing 210018, China | 2004 | Journal of Materials Science & Technology2004，20，5： | 0 |
| 15 | Dissimilar laser welding of CrMnFeCoNi high entropy alloy and 316LN stainless steel for cryogenic application显示文摘The microstructure and mechanical properties of dissimilar laser beam welded joint between CrMnFeCoNi alloy and 316LN stainless steel was investigated.The results showed that the defect-free dissimilar joint was obtained by laser beam welding.The ultimate strength of the welded joints can reach∼90%of the base materials at both room and cryogenic temperatures.The deformation substructure mainly consisted of planar dislocation,the stacking faults and the dissociation of stacking faults into nanotwins.The volume fraction of the nanotwins was increasing at cryogenic temperature.The hardness fluctuates greatly in welded joint and the lowest hardness was located at fusion zone near the fusion line.The fracture of the welded joint was located at the fusion zone in consistence with the lowest hardness area.It is mainly attributed to the coarse grain and stress concentration at this area. | Jijun Xin Wei Wang Xiao Yang Mebrouka Boubeche Shanlin Wang Hengcheng Zhang Chuanjun Huang Yong Li Bingkun Lyu Fuzhi Shen Wentao Sun Laifeng Li | 2023 | Journal of Materials Science & Technology2023，，32： | 0 |
| 16 | Effect of phosphor addition on eutectic solidification and microstructure of an Al-13%Si alloy显示文摘As the refiner or modifier, the master alloys containing high concentration phosphor are widely used in preparing eutectic or hypereutectic Al-Si alloys. To study the effect of phosphor addition on the eutectic solidification and microstructure of the Al-13%Si alloy, an investigation has been undertaken by means of thermal analysis and micro/macro-structure observation. Results indicate that addition of phosphor in near eutectic Al-Si alloy promotes the nucleation of eutectic but has little refinement impact on primary Si particles as expected. Conversely, both primary Si particles and eutectic Si flakes become slightly coarser in P-rich alloys. The coarsening of eutectic Si flakes ties closely to the increased eutectic growth temperature with phosphor addition. The eutectic solidification of the alloy proceeds from the near mold zone towards the center, and it is also found that a few independent nucleation regions emerge in liquid at the solidification front due to the addition of phosphor. | Liao Hengcheng Zhao Lei Xi Xiao | 2011 | China Foundry2011，8，4： | 0 |
| 17 | Effects of Strontium,Magnesium Addition,Temperature Gradient,and Growth Velocity on Al-Si Eutectic Growth in a Unidirectionally-solidified Al-13 wt%,Si Alloy显示文摘Al—Si eutectic growth mechanism was investigated in a directionally-solidified Al—13 wt%Si alloy with different strontium(Sr) and magnesium(Mg) additions,growth velocities and temperature gradients.Macro- and microscale metallographic analyses revealed that addition level of Sr and Mg,temperature gradient and growth velocity are important factors affecting stability of solidifying Al—Si eutectic front and the final morphology of eutectic grains in the solidified Al—13 wt%Si alloys.By varying(tailoring) these factors,a variety of eutectic grain structures and morphologies such as planar front,cellular structure,a mix of cellular and columnar,or equiaxed dendrites,can be obtained.Increasing temperature gradient,reducing growth velocity,or decreasing Sr and Mg contents is beneficial to stabilizing planar growth front of eutectic grains,which is qualitatively in accordance with constitutional supercooling criterion for binary eutectic growth.In contrast,adding more Sr and Mg,increasing growth velocity,or decreasing temperature gradient produces large constitutional supercooling,leading to columnar-equiaxed transition(CET) of eutectic structure,which can be interpreted on the basis of Hunt's Model.It is also found that both solute concentration and solidification variables have significant impact not only on eutectic growth,but also on gas porosity formation. | Hengcheng Liao Wanru Huang Qigui Wang Fang Jia | 2014 | Journal of Materials Science & Technology2014，30，2： | 0 |
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