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Transformation behavior of precipitates during artificial aging at 170℃in Al-Mg-Si-Cu alloys with and without zn addition

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Rare Metals 2021年第7期40卷 1907-1914页

作者： Shang Zhu Zhi-Hui Li Li-Zhen Yan Xi-Wu Li Shu-Hui Huang Hong-Wei Yan Yong-An Zhang Bai-Qing Xiong State Key Laboratory of Nonferrous Metals and Processes GRIMAT Engineering Institute Co..LtdBeijing 101407China

The transformation behavior of precipitates in Al-Mg-Si-Cu alloys with and without zn addition during artificial aging at 170℃was investigated in this *** Al-Mg-Si-Cu alloys with and without zn addition,two types of precipitates,needle-likeβ″and lath-like L,are formed with the aging time increasing from 8 to 34 *** needle-likeβ″precipitate exhibits a Mg-to-Si atomic ratio of 1.31 which is in agreement with the theoretical ratio of1.25 forβ″(Mg5 Al2 Si4).In addition,theβ″precipitate is supposed to contain Al and *** further partitioning of Mg,Si and Cu and release of Al,the needle-likeβ″precipitate can transform to lath-like L *** L phase has significantly higher concentrations of Mg,Si and Cu and lower concentration of Al,with a higher Mg-to-Si atomic ratio(1.41)deviated from theoretical ratio ofβ″.However,the major of zn has a random distribution in Al matrix and exhibits no significant partitioning into *** remained in matrix can enhance the transformation ofβ″precipitates to L precipitates.

关键词： Al-Mg-Si-Cu alloys zn addition Precipitates Transformation

Precipitation modification in cast Mg-1Nd-1Ce-Zr alloy by zn addition

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Journal of Magnesium and Alloys 2019年第1期7卷 113-123页

作者： Yiyuan Zhou Penghuai Fu Liming Peng Dan Wang Yingxin Wang Bin Hu Ming Liu Anil K.Sachdev Wenjiang Ding National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composite Shanghai Jiao Tong UniversityShanghai 200240PR China Shanghai Light Alloy Net Forming National Engineering Research Center Co. LtdShanghai 201615PR China General Motors China Science Laboratory Shanghai 201206PR China General Motors Research&Development Center WarrenMI 48090USA

The effects of different zn addition(0,0.2,0.5,1.0 wt%)on the microstructure and mechanical properties of cast Mg-1Nd-1Ce-Zr alloy in as-cast,solution-treated and 200℃peak-aged conditions were *** in cast Mg-1Nd-1Ce-Zr alloy are significantly modified by the zn *** the zn-free alloy,the disk-shaped prismatic precipitates and the point-like precipitates are the main strengthening *** 0.2 zn is added,the disk-shaped precipitates are refined and very fine basal precipitates form *** 0.5 zn is added,the basal precipitates become the main strengthening *** increasing the zn addition to 1.0%,only spare basal precipitates and point-like precipitates *** 0.5 zn addition alloy has the highest strength at room temperature,whose yield strength,ultimate tensile strength and elongation in T6 condition are 136 MPa,237 MPa and 9%,respectively.

关键词： Mg alloy Precipitate Rare earth zn addition Mechanical properties Mg wheel

Atomic-scale roles of zn element in age-hardened AlMgSizn alloys

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Journal of Materials Science & Technology 2021年第11期70卷 105-112页

作者： N.N.Jiao Y.X.Lai S.L.Chen P.Gao J.H.Chen Center for High-Resolution Electron Microscopy College of Materials Science&EngineeringHunan UniversityChangsha410082China Electron Microscopy Laboratory and International Center for Quantum Materials School of PhysicsPeking UniversityBeijing100871China

Adding alloying elements to improve the performances or the manufacturing processes of Al-Mg-Si alloys has long been a serious issue in developing advanced automotive aluminum *** zn element,among those promising ones,has demonstrated positive alloying effects on Al-Mg-Si ***,the atomic-scale roles of zn in an age-hardened Al-Mg-Si-zn alloy have not been adequately *** atomic-resolution electron microscopy,here we report the precise locations of zn elements in all hardening precipitates involved and their alloying mechanism at the atomic scale when alloying the *** results show that zn atoms enter all the major hardening phases to occupy specific featured atomic sites of the original elements,*** Si1 and Mg2 sites in theβ’-2 phase,and modify their crystal structures,interfacial structures and morphologies in characteristic *** is revealed that for theβ’-phase,zn atoms occupy unique atomic sites,whereas for other phases,they demonstrate similar behaviors as other additive alloying elements such as Ag and Cu do.

关键词： Al-Mg-Si alloy zn addition Precipitate Electron microscopy

Effects of minor zn content on microstructure and corrosion properties of Al-Mg alloy

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Journal of Central South University 2016年第12期23卷 3051-3059页

作者：赵经纬罗兵辉何克坚柏振海李彬陈维 School of Materials Science and Engineering Central South University Advanced Research Centre Central South University

The effects of different zn contents in Al-Mg alloy on the microstructure characterizations were observed by advanced electron microscopy and the corrosion properties were investigated by the inter-granular corrosion tests,the exfoliation corrosion tests,and the Potentiodynamic polarizaion *** τ phase(Mg_(32)(Al,zn)_(49)) forms on the pre-existing Mn-rich particles and at the grain *** to the theory of binding energy,the formation of τ phase is much easier than that of β phase(Al_3Mg_2),somehow replacing β phase and reducing the possibility of β phase *** change dramatically decreases the susceptibility of *** zn addition increases the corrosion resistance of Al-Mg alloy with an optimal value of 0.31%.When the zn addition is increased to 0.78%,however,the corrosion resistance of alloy decreases once again but it is still better than that of the alloy without zn addition.

关键词： Al-Mg alloy zn addition r phase (Mg32 (Al, zn)49 ) corrosion

Effect of trace zn,P and Mg additions on microstructure and mechanical properties of Nb-Si-Ti alloys

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Progress in Natural Science:Materials International 2011年第2期21卷 139-145页

作者： Mei-ling WU,Shu-suo LI,Li-wu JIANG,Sheng-kai GONG,Ya-fang HAN School of Materials Science and Engineering,Beihang University,Beijing 100191,China School of Materials Science and Engineering Beihang University Beijing 100191 China

The effects of zn,P and Mg additions on the microstructure and mechanical properties of Nb-22Ti-3Si alloys were studied. The phases of Nbss and Nb3Si presented in Nb-22Ti-3Si(AC1),Nb-22Ti-3Si-0.2zn(AC2) and Nb-22Ti-3Si-0.2Mg alloys(AC3). The Nb-22Ti-3Si-0.2P(AC4) alloy consisted of Nbss,Nb3Si network and eutectic cell of Nbss/α-*** the addition of zn,the Nb3Si network was broken and the volume fraction of Nbss increased from 92%to 96%.The values of fracture toughness of the alloy AC2 at ambient temperature increased from 22,58 MPa·m1/2to 26.41 MPa·m1/*** values of compressive strength for the zn-added alloy at ambient temperature and 1 250℃increased from 1 525.10 MPa to 1 652.44 MPa,and from 268.52 MPa to 284.18 MPa,*** with the alloy AC1,the addition of P promoted the formation ofα-Nb5Si phase but the values of fracture toughness and compressive strength of alloy at room temperature and 1 250℃*** contrast,the addition of Mg improved the compressive strength at ambient temperature and 1250℃from 1 525.10 MPa to 1 618.08 MPa and from 268.52 MPa to 348.28 MPa,*** relationship between the microstructure and the mechanical properties was discussed.

关键词： Nb-Si-Ti alloy zn addition P Mg microstructure mechanical property

Microstructural Characteristics and Mechanical Properties of Cast Mg–3Nd–3Gd–xzn–0.5Zr Alloys

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Acta Metallurgica Sinica(English Letters) 2022年第6期35卷 922-940页

作者： He Xie Guohua Wu Xiaolong Zhang Zhongquan Li Wencai Liu Liang Zhang Xin Tong Baode Sun National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composites School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China Shanghai Spaceflight Precision Machinery Institute Shanghai 201600China

The microstructure,aging behavior and mechanical properties of cast Mg–3Nd–3Gd–x zn–0.5Zr(x=0,0.5,0.8,1 wt%)alloys are investigated in this ***–Zr particles with different morphologies form during solution treatment due to the additions of *** the zn content increases,the number density of zn–Zr particles also *** comparisons of peak-aged studied alloys indicate that varying zn additions could profoundly influence the competitive precipitation *** the peak-aged zn-free alloy,β′′phases are the key strengthening *** 0.5 wt%zn is added,besidesβ′′precipitates,additional fineβ_(1)precipitates *** the addition of 0.8 wt%zn,the peak-aged 0.8zn alloy is characterized by predominantly prismaticβ_(1)and scanty basal precipitate *** enhanced precipitation ofβ_(1)should be primarily attributable to the presence of increased zn–Zr *** zn content further increases to 1 wt%,the precipitation of basal precipitates is markedly *** precipitates andβ_(1)phases are the key strengthening precipitates in the peak-aged 1zn *** tests reveal that the relatively best tensile properties are achieved in the peak-aged alloy with 0.5 wt%zn addition,whose yield strength,ultimate tensile strength and elongation are 179 MPa,301 MPa and 5.3%,respectively.

关键词： Mg-Nd-Gd alloy zn addition Competitive precipitation behavior Microstructural characterization