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The characterization of fe-rich phases in a high-pressure die cast hypoeutectic aluminum-silicon alloy

Journal of Materials Science & Technology 2020年第16期47卷 54-62页

作者： X.Y.Jiao C.F.Liu Z.P.Guo G.D.Tong S.L.Ma Y.Bi Y.F.Zhang S.M.Xiong School of Materials Science and Engineering Tsinghua UniversityBeijing 100084China Key Laboratory for Advanced Materials Processing Technology Tsinghua UniversityBeijing 100084China China FAW Foundary Co. LTDChangchun 130011China

Both microstructural characteristics and fracture behavior of fe-rich phases in a high-pressure die-cast hypoeutectic Al-Si alloy were *** was focused on the morphology and formation mechanism of fe-rich phases,together with their influence on *** show that primary ferich phases exhibited in blocky shape precipitated from liquid while secondary fe-rich phase in a large net shape was distributed along eutectic boundary participating in a ternary eutectic *** synchrotron X-ray tomography characterization,three fe-rich phases with different morphologies,i.e.,polyhedral shape,fine compact shape and Chinese script-type shape were extracted along the radial *** slow-shot speed promoted the polyhedral fe-rich phase to precipitate in slow-shot sleeve while decreased the formation of fine compact and Chinese script-type fe-rich phases in die *** of a worse deformation compatibility,polyhedral fe-rich phases fractured and became stress concentration sources before the failure of the casting.

关键词： Hypoeutectic Al-10Si fe-rich phases Fracture morphology High pressure die casting

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Nucleation and growth of fe-rich phases in Al-5Ti-1B modified Al-fe alloys investigated using synchrotron X-ray imaging and electron microscopy

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Journal of Materials Science & Technology 2021年第21期80卷 84-99页

作者： Yuliang Zhao Weiwen Zhang Dongfu Song Bo Lin Fanghua Shen Donghai Zheng ChunXiao Xie Zhenzhong Sun Yanan Fu Runxia Li Neutron Scattering Technical Engineering Research Centre School of Mechanical EngineeringDongguan University of TechnologyDongguan523808China Guangdong-Hong Kong-Macao Joint Laboratory for Neutron Scattering Science and Technology Dongguan University of TechnologyDongguan523808China National Engineering Research Centre of Near-net-shape Forming for Metallic Materials South China University of TechnologyGuangzhou510641China Guangdong Institute of Materials and Processing Guangdong Acadamy of ScienceGuangzhou510650China School of Mechanical Engineering Guizhou UniversityGuiyang550025China Shanghai Synchrotron Radiation Facility.Shanghai Advanced Research Institute CASShanghai201204China School of Materials Science and Engineering Dongguan University of TechnologyDongguan523808China

Plate-like fe-rich intermetallic phases directly influence the mechanical properties of recycled Al alloys;thus, many attempts have been made to modify the morphology of these phases. Through synchrotron X-ray imaging and electron microscopy, the underlying nucleation and growth mechanisms of fe-rich phases during the solidification of Al-5 Ti-1 B-modified Al-2 fe alloys were revealed in this study. The results showed that the Al-5 Ti-1 B grain refiner as well as the applied pressure both resulted in reduction of the size and number of primary Al_(3)fe phases and promoted the formation of eutectic Al_(6)fe *** tomography results demonstrated that Al-5 Ti-1 B changed the three-dimensional(3 D) morphology of primary fe-rich phases from rod-like to branched plate-like, while a reduction in their thickness and size was also observed. This was attributed to the fact that Ti-containing solutes in the melts inhibit the diffusion of fe atoms and the Al_(3)fe twins produce re-entrant corner on the twin boundaries along the growth direction. Moreover, the TiB_(2) provides possible nucleation sites for Al_6fe phases. The nucleation mechanism of fe-rich phases is discussed in terms of experimental observations and crystallography calculations. The decrease in the lattice mismatch between TiB_(2) and Al_(6)fe phases was suggested, which promoted the transformation of Al_(3)fe to Al_(6)fe phases.

关键词： Al alloys Synchrotron X-ray imaging fe-rich phases Grain refinement Nucleation and growth

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Influence of high pressure and manganese addition on fe-rich phases and mechanical properties of hypereutectic Al-Si alloy with rheo-squeeze casting

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Transactions of Nonferrous Metals Society of China 2019年第2期29卷 253-262页

作者： Chong LIN Shu-sen WU Shu-lin Lü He-bao WU Han-xin CHEN Hubei Provincial Key Laboratory of Chemical Equipment Intensification and Intrinsic Safety Wuhan Institute of TechnologyWuhan 430205China State Key Laboratory of Materials Processing and Die&Mould Technology Huazhong University of Science and TechnologyWuhan 430074China

The influence of high pressure and manganese addition on fe-rich phases(FRPs)and mechanical properties of Al-14Si-2fe alloy with rheo-squeeze casting(RSC)was *** semi-solid alloy melt was treated by ultrasonic vibration(UV)firstly,and then formed by squeeze casting(SC).Results show that the FRPs in as-cast SC alloys are composed of coarseβ-Al5(fe,Mn)Si,δ-Al4(fe,Mn)Si2 and bone-shapedα-Al15(fe,Mn)3Si2 phases when the pressure is 0 *** RSC process,the FRPs are first refined by UV,and then the solidification under pressure further causes the grains to become *** peritectic transformation occurs during the formation ofα*** the alloy with the same composition,the ultimate tensile strength(UTS)of RSC sample is higher than that of the SC *** the same forming process,the UTS of Al-14Si-2fe-0.8Mn alloy is higher than that of Al-14Si-2fe-0.4Mn alloy.

关键词： high pressure manganese rheo-squeeze casting hypereutectic Al-Si alloy fe-rich phases mechanical properties

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