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中国有色金属学会会刊：英文版 2010年第S3期20卷 837-841页

作者： E.P.MASUKU H.MLLER U.A.CURLE P.C.PISTORIUS Materials Science and manufacturing Council for Scientific Industrial ResearchPretoriaSouth Africa Department of Materials Science and Engineering Carnegie Mellon UniversityPittsburghUSA

The corrosion behavior(in chloride medium) of the surface layer of SSM-HPDC plates of alloys 7075-T6 and 2024-T6 was compared with that of the wrought alloys 7075-T6 and *** testing was performed in deaerated 3.5%NaCl *** separate tests,the open-circuit potential was monitored in aerated 3.5% NaCl for 30 min after *** electrochemical tests show that there is no significant difference in the pitting potential of the wrought alloys and that of the Cu-enriched surfaces of the SSM-HPDC alloys.

关键词： semi-solid metal(SSM) forming wrought aluminium alloys alloy 7075 alloy 2024 corrosion surface liquid segregation

Microstructural evolution and properties of a Cu-Cr-Ag alloy during continuous manufacturing process

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Rare metals 2021年第8期40卷 2213-2220页

作者： Gao-Lei Xu Li-Jun Peng Guo-Jie Huang Hao-Feng Xie Zhen Yang Xue Feng Xiang-Qian Yin Xu-Jun Mi State Key Laboratory of Nonferrous metals and Processes GRIMAT Engineering Institute Co.Ltd.Beijing101417China Zhejiang Libo Industrial Co. Ltd.Shaoxing312050China

Microstructure evolution and properties of a Cu-Cr-Ag alloy during the continuous manufacturing process were investigated in detail by scanning electron microscopy(SEM)and transmission electron microscopy(TEM)in the *** Cu-Cr-Ag alloy rod with uniform compositions is fabricated by upward continuous casting *** of the Cr phases are observed in the ascast *** the continuous extrusion process,the severe shear deformation and the dynamic aging *** average grain size of as-extruded alloy is much smaller than that of as-cast *** fcc and bcc Cr precipitates appear in the *** interaction mode between dislocations and precipitates can be identified as Orowan bypass mode according to the TEM *** overall difference in the yield strength between as-cast and as-extruded Cu-Cr-Ag alloy is attributed to solid solution strengthening,grain refinement strengthening,precipitation hardening and working hardening.

关键词： Cu-Cr-Ag alloy Upward continuous casting Continuous extrusion Microstructure Physical properties

Influence of aluminum content on machinability of AS series cast magnesium alloys

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Transactions of Nonferrous metals Society of China 2014年第11期24卷 3452-3458页

作者： Birol AKYZ Department of Mechanical and manufacturing Engineering Bilecik Seyh Edebali University

The influence of Al content on machinability of AS series cast Mg alloys was studied. The assessment of machinability of Mg alloys was performed by measuring the cutting forces and surface roughness. The microstructure and the tensile properties were also studied. The results reveal that cutting forces are increased with the increase of the Al content. Surface roughness and mechanical properties are the highest for AS91 Mg alloy. It is assumed that the main mechanism, which has an influence on the mechanical properties, is the presence of intermetallic phases(Mg2Si and Mg17Al12). Cutting forces increase with the increase of the cutting speed in machining of all Mg alloys. These measured data are in accordance with the mechanical properties of the machined alloys.

关键词： machinability cutting force Mg alloy AS series alloys flank build-up(FBU)

Influence of Al content on machinability of AZ series Mg alloys

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Transactions of Nonferrous metals Society of China 2013年第8期23卷 2243-2249页

作者： Birol AKYUZ Department of Mechanical and manufacturing Engineering Bilecik Seyh Edebali University

Influence of A1 content on the machinability of AZ series cast Mg alloys was investigated. In order to evaluate the machinability of the alloys, measurements of the cutting forces during turning operations and surface roughness were carried out as well as considering the microstructure and tensile properties. The results show that maximum tensile properties are observed with 2% （mass fraction） A1 addition to Mg. As the A1 content of the alloy increases above 2%, the cutting forces tend to reduce along with the ductility owing to the grain boundary precipitation of intermetallic phase （fl-Mgl7All2）. Cutting forces are able to increase as the cutting speed increases for all the alloys studied, and it＇s attributed to flank built up at the tip of the cutting tool during machining.

关键词： machinability cutting force Mg AZ series alloys

Comparative study on corrosion behaviors of Mg-Al-Zn alloys

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Transactions of Nonferrous metals Society of China 2018年第4期28卷 642-650页

作者： Sennur CANDAN Ercan CANDAN Department of Mechanical and manufacturing Engineering Bilecik Seyh Edebali University

A comparative study on corrosion behaviors of various Mg-Al-Zn alloys(AZ21,AZ41,AZ61 and AZ91 series,cast under same cooling conditions and controlled alloying composition)was carried *** electron microscopy(SEM)and X-ray diffraction(XRD)were used for microstructural *** corrosion behaviors were evaluated by immersion tests and potentiodynamic polarization measurements in 3.5%NaCl *** results showed that the influence of Al addition on corrosion resistance was more pronounced up to 4%(***41)above which its influence was at less *** deterioration of the corrosion resistance of the alloys,at higher Al contents,was attributed to the amount and morphology ofβ-Mg17Al12 intermetallics and the interruption of continuity of the oxide film on the surface of the alloys owing to coarsenedβintermetallics.

关键词： Mg alloy AZ series alloys casting corrosion

Effects of Cu and Mg on thixoformability and mechanical properties of aluminium alloy 2014

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Transactions of Nonferrous metals Society of China 2020年第2期30卷 275-287页

作者： M.A.M.ARIF M.Z.OMAR Z.SAJURI M.S.SALLEH Centre for Materials Engineering and Smart manufacturing(MERCU) Faculty of Engineering and Built EnvironmentUniversiti Kebangsaan Malaysia43600SelangorMalaysia Department of manufacturing Process Faculty of Manufacturing EngineeringUniversiti Teknikal MelakaHang Tuah Jaya76100 Durian TunggalMelakaMalaysia

Thixoforming is a processing method that deforms metal in a semisolid *** advantages of this process include the production of parts with good surface finish,fine microstructures and superior mechanical ***,the process mostly produces parts from aluminium cast grades,thereby not fully utilising the true potential of this ***,thermodynamic modelling can be used to formulate alloy compositions that favour this processing ***,the effects of reducing copper content and increasing silicon and magnesium contents on the thixoformability of aluminium alloy 2014 were *** work consists of both the modelling and experimental *** showed that by increasing Si and decreasing Cu content in the alloy,the solidification interval temperature was decreased and the temperature working window between the stipulated liquid fractions was widened,two of the characteristics favouring the process.A high solid-solution temperature employed resulted in the dissolution of unfavourable Mg2Si *** increase in Mg content used also resulted in the formation of the compactπ-Al8FeMg3Si6 phase and the decrease in the amount of the sharp and plate-like structure of theβ-Al5FeSi phase,improving the strength of the modified *** T6 heat treatment successfully further increased the strength of the modified alloy.

关键词： JMatPro wrought 2014 aluminium alloy thixoformability semisolid processing mechanical properties

manufacturing of cast A356 matrix composite reinforced with nano- to micrometer-sized SiC particles

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Rare metals 2017年第1期36卷 46-54页

作者： Reza Taherzadeh Mousavian Rasoul Azari Khosroshahi Sasan Yazdani Dermot Brabazon Faculty of Materials Engineering Sahand University of Technology Tabriz 65175-4171 Iran Advanced Processing Technology Research Centre School of Mechanical and Manufacturing Engineering Dublin City University Dublin 9 Ireland

In this study, large micron-sized Si C particles were fragmented via ball-milling process in the presence of iron and nickel powders, separately, to fabricate composite powders of Fe–Si C and Ni–Si C. Continuous fracturing of brittle Si C powders leads to the formation of multi-modalsized Si C powders with size of from 50 nm to slightly higher than 10 lm after 36-h ball milling. The milled powders were then incorporated into the semisolid melt of A356 aluminum alloy to ease the incorporation of fine Si C particles by using iron and nickel as their carrier *** final as-cast composites were then extruded at 500 °C with a reduction ratio of 9:1. Lower-sized composite powders with slight agglomeration are obtained for the36-h milled Ni–Si C mixture compared to that of Fe–Si C powders, leading to incorporation of Si C particles into the melt with a lower size and suitable distribution for the Ni–Si C mixture. It is found that lower-sized composite particles could release the fine Si C particles into the melt more easily, while large agglomerated composite particles almost remain in its initial form, resulting in sites of stress concentration and low-strength aluminum matrix composites. Ultimate tensile strength(UTS) and yield strength(YS) values of 243 and 135 MPa, respectively, are obtained for the aluminum matrix composite in which nickel acts as the carrier of fine ceramic particles.

关键词： Aluminum matrix composite Semisolid casting Extrusion Ni Fe

Effects of deformation twinning on the mechanical properties of biodegradable Zn-Mg alloys

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Bioactive Materials 2019年第1期4卷 8-16页

作者： Shiyang Liu Damon Kent Nghiem Doan Matthew Dargusch Gui Wang School of Mechanical and Mining Engineering The University of QueenslandSt Lucia4072Australia Centre for Advanced Materials Processing and manufacturing(AMPAM) The University of QueenslandSt Lucia4072Australia School of Science and Engineering University of the Sunshine CoastMaroochydoreDC4558Australia ARC Research Hub for Advanced manufacturing of Medical Devices The University of QueenslandSt Lucia4072Australia School of Dentistry and Oral Health Griffith UniversityGold Coast4215Australia

To satisfy the property requirements for biodegradable medical implants,Zn alloyed with low levels of Mg(≤0.8 wt%)has attracted increased research *** the present study,deformation twinning was observed in tensile tests and twinning appears to have an adverse impact on *** profuse twinning in the as-cast Zn-Mg alloys accelerated crack growth in tension due to twinning impingement which caused local stress concentrations and initiates ***-rolled Zn-Mg alloys have better ductility than their as-cast counterparts due to the inhibition of twinning by the refined Mg2Zn11 intermetallic phase and the finer grain size.

关键词： Biodegradable metals Zn-Mg alloys Deformation twinning Mechanical properties Hot rolling

Effect of Sn content on microstructure and tensile properties of as-cast and as-extruded Mg-8Li-3Al-(1,2,3)Sn alloys

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Transactions of Nonferrous metals Society of China 2020年第8期30卷 2079-2089页

作者： Xiao-yang CHEN Yang ZHANG Meng-qi CONG Ya-lin LU Xiao-ping LI Key Laboratory of Advanced Materials Design and Additive manufacturing of Jiangsu Province Jiangsu University of TechnologyChangzhou 213001China

The effects of Sn content on microstructure and tensile properties of as-cast and as-extruded Mg-8Li-3Al-(1,2,3)Sn(wt.%)alloys were investigated by X-ray diffractometry(XRD),optical microscopy(OM),scanning electron microscopy(SEM)and tensile *** is found that,as-cast Mg-8Li-3Al-(1,2,3)Sn alloys consist ofα-Mg+β-Li duplex matrix,MgLiAl2 and Li2Mg Sn *** Sn content leads to grain refinement ofα-Mg dendrites and increase in content of Li2MgSn *** hot extrusion,complete dynamic recrystallization(DRX)takes place inβ-Li phase while incomplete DRX takes place inα-Mg *** Sn content is increased,the volume fraction of DRXedα-Mg grains is increased and the average grain size of DRXedα-Mg grains is *** Sn content is beneficial to strength but harmful to ductility for as-cast Mg-8Li-3Al-(1,2,3)Sn *** properties of Mg-8Li-3Al-(1,2,3)Sn alloys are improved significantly via hot extrusion and Mg-8Li-3Al-2Sn alloy exhibits the best tensile properties.

关键词： Mg-Li-Al-Sn alloy as-cast state recrystallization microstructure tensile properties

Microstructural evolution during semisolid processing of Al-Si-Cu alloy with different Mg contents

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Transactions of Nonferrous metals Society of China 2017年第7期27卷 1483-1497页

作者： K.S.ALHAWARI M.Z.OMAR M.J.GHAZALI M.S.SALLEH M.N.MOHAMMED Department of Mechanical and Materials Engineering Faculty of Engineering and Built EnvironmentUniversiti Kebangsaan MalaysiaSelangor 43600Malaysia Department of manufacturing Process Faculty of Manufacturing EngineeringUniversiti Teknikal Malaysia MelakaMelaka 76100Malaysia Department of Engineering&Technology Faculty of Information Sciences and EngineeringManagement&Science UniversitySelangor 40100Malaysia

A series of Al-6Si-3Cu-(0.3-2)Mg alloys were produced by a conventional casting *** slope technique wasemployed to produce feedstocks before they were thixoformed at50%liquid *** effect of Mg on the microstructure ofAl-Si-Cu aluminium alloys under as-cast and semisolid conditions was *** was found that by adding Mg to Al-Si-Cualloy,some of the Al2Cu phase and silicon were consumed to form Al5Cu2Mg3Si5and Mg2Si *** needle-likeβ-Al5FeSi phasetransformed to Chinese-script-likeπ-Al8Mg3FeSi6with the addition of *** the as-cast alloys,the primaryα(Al)was dendritic,butas the Mg content increased,the phase became less ***,the Mg addition considerably modified the size of theα(Al)phase,but it had no significant effect on the silicon *** the thixoformed alloys,the microstructure showed a fine globularprimary phase surrounded by uniformly distributed silicon and fragmented intermetallic *** eutectic silicon was modifiedfrom a flaky and acicular shape to fine fibrous *** effect of Mg on eutectic silicon during semisolid processing *** primary Mg2Si particles were modified from big polygonal particles to become smaller and more globular,whereas themorphology of the Chinese-script-likeπ-Al8Mg3FeSi6changed to a compact *** results also exhibit that as the Mg content inthe A319alloy increased,the hardness,yield strength and ultimate tensile strength of the thixoformed alloys significantly improved,but the elongation to fracture dropped.

关键词： Al-Si-Cu alloy magnesium microstructure semisolid processing