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Effect of Particle Size on Mechanical Properties and Fracture Behaviors of Age-Hardening SiC/Al–Zn–Mg–Cu Composites

Acta Metallurgica Sinica(English Letters) 2021年第10期34卷 1447-1459页

作者： Guonan ma Dong Wang Bolv Xiao zongyi ma Institute of Metal Research Chinese Academy of SciencesShenyang 110016China School of materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China

15 vol.% SiC/Al-6.5Zn-2.8 Mg-1.7 Cu(wt%) composites with varying particle sizes(3.5, 7.0, 14 and 20 μm), i.e., C-3.5, C-7.0, C-14, and C-20, respectively, were fabricated by powder metallurgy(PM) method and subjected to microstructural examination. The effect of particle size on mechanical properties and fracture behaviors of the T6-treated composites was revealed and analyzed in detail. Element distribution and precipitates variations in the composites with varying particle sizes were emphatically considered. Results indicated that both tensile strength and plasticity of the T6-treated composites increased first and then decreased with particle size decreasing. The C-7.0 composite simultaneously exhibited the highest ultimate tensile strength(UTS) of 686 MPa and best elongation(El.) of 3.1%. The smaller-sized SiC particle would introduce more oxide impurities, which would react with the alloying element in the matrix to cause Mg segregation and depletion. According to strengthening mechanism analysis, the weakening of precipitation strengthening in the T6-treated C-3.5 composite was the main cause of the lower tensile strength. Additionally, the larger SiC particle, the more likely to fracture, especially in the composites with high yield strength. For the T6-treated C-20 composites, more than 75% SiC particles were broken up, resulting in the lowest plasticity. As decreasing particle size, the fracture behaviors of the T6-treated composites would change from particle fracture to matrix alloy fracture gradually.

关键词： Metal matrix composites Mechanical properties Particle size Fracture behaviors Strengthening mechanisms

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Fabrication of high strength carbon nanotube/7055Al composite by powder metallurgy combined with subsequent hot extrusion

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Science China(Technological Sciences) 2021年第5期64卷 1081-1091页

作者： ma Kai LIU ZhenYu ZHANG XingXing XIAO BoLv ma zongyi Shi-changxu Innovation Center for Advanced materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China

Bimodal carbon nanotube reinforced 7055Al(CNT/7055Al) composites containing coarse grain bands and ultra-fine grain zones were fabricated by high energy ball milling, vacuum hot pressing followed by hot extrusion. The effect of extrusion temperature varied from 320℃ to 420℃ on the microstructure evolution and tensile properties were investigated. Microstructure observation indicates that the elongated coarse grain bands aligned along the extrusion direction after extrusion. The width of the coarse grain bands increased, and the length of the coarse grain bands increased firstly and then decreased with the increase of extrusion temperature. The grain size of the ultra-fine grain zones changed little after hot extrusion, but the ultra-fine grains coarsened after subsequent heat treatment, especially for the composite extruded at low temperature of 320℃. By observing the CNT distribution, it was found that the higher temperature extrusion was beneficial to the CNT orientation along the extrusion ***, a precipitated free zone formed at the boundary between the coarse grain band and the ultra-fine grain zone as the composite extruded at high temperature of 420℃. As the result of the comprehensive influence of the above microstructure, the tensile strength of the composite extruded at moderate temperature of 370℃ reached the highest of 826 MPa.

关键词： carbon nanotube aluminum matrix composite hot extrusion bimodal mechanical property

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EFFECT　OF　PARTICULATE　SIZE　AND　CONTENT　ON　STRENGTH　OF　SiC_p／2024Al　COMPOSITE　AND　ITS　RELATIONSHIP　WITH　T6－TREATMENT

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中国有色金属学会会刊：英文版 1995年第3期5卷 127-132页

作者： ma, zongyi Liang, Yanan Lu, Yuxiong Bi, Jing Chinese Acad of Sciences Shenyang China

ＥＦＦＥＣＴＯＦＰＡＲＴＩＣＵＬＡＴＥＳＩＺＥＡＮＤＣＯＮＴＥＮＴＯＮＳＴＲＥＮＧＴＨＯＦＳｉＣ_ｐ／２０２４ＡｌＣＯＭＰＯＳＩＴＥＡＮＤＩＴＳＲＥＬＡＴＩＯＮＳＨＩＰＷＩＴＨＴ６－ＴＲＥＡＴＭＥＮＴ￥Ｍａ，Ｚｏｎｇ... 详细信息

ＥＦＦＥＣＴＯＦＰＡＲＴＩＣＵＬＡＴＥＳＩＺＥＡＮＤＣＯＮＴＥＮＴＯＮＳＴＲＥＮＧＴＨＯＦＳｉＣ_ｐ／２０２４ＡｌＣＯＭＰＯＳＩＴＥＡＮＤＩＴＳＲＥＬＡＴＩＯＮＳＨＩＰＷＩＴＨＴ６－ＴＲＥＡＴＭＥＮＴ￥Ｍａ，Ｚｏｎｇｙｉ；Ｌｉａｎｇ，Ｙａｎａｎ；Ｌｕ?..

关键词： composite particulate aluminum T6-treatment strength

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Compressive Creep Behavior of TiC/AZ91D magnesium-matrix Composites with Interpenetrating Networks

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Journal of materials Science & Technology 2007年第2期23卷 207-212页

作者： Liqing CHEN Jinhua GUO Baohai YU zongyi ma The State Key Laboratory of Rolling and Automation Northeastern University Shenyang 110004 China Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China

The 42.1 vol. pct TiC/AZ91D magnesium-matrix composites with interpenetrating networks were fabricated by in-situ reactive infiltration process. The compressive creep behavior of as-synthesized composites was investigated at temperature ranging from 673 to 723 K under loads of 95-108 MPa. For a comparative purpose,the creep behavior of the monolithic matrix alloy AZ91D was also conducted under loads of 15-55 MPa at 548-598 K. The creep mechanisms were theoretically analyzed based on the power-law relation. The results showed that the creep rates of both TiC/AZ91D composites and AZ91D alloy increase with increasing the temperature and load. The TiC/AZ91D composites possess superior creep resistance as compared with the AZ91D alloy. At deformation temperature below 573 K, the stress exponent n of AZ91D alloy approaches theoretical value of 5, which suggests that the creep process is controlled by dislocation climb. At 598 K, the stress exponentof AZ91D is close to 3, in which viscous non-basal slip deformation plays a key role in the process of creep deformation. However, the case differs from that of AZ91D alloy when the stress exponent n of TiC/AZ91D composites exceeds 9, which shows that there exists threshold stress in the creep process of the composites, similar to other types of composites. The average activation energies for the creep of the AZ91D alloy and TiC/AZ91D composites were calculated to be 144 and 152 k J/mol, respectively. The existence of threshold stress in the creep process of the composites leads to an increase in activation energy for creep.

关键词： magnesium-matrix composites TiC/AZ91D Interpenetrating networks In-situ reactive infiltration Creep

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EFFECT OF maTRIX STRENGTHENING ON SLIDING WEAR PROPERTIES OF SiCp/2024Al COMPOSITES

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中国有色金属学会会刊：英文版 1998年第4期8卷 25-30页

作者： ma, zongyi Liang, Yan'an Lu, Yuxiong Bi, Jing Inst of Metal Research Chinese Acad of Sciences Shenyang China

ＩＮＴＲＯＤＵＣＴＩＯＮＴｈｅｃｅｒａｍｉｃｐａｒｔｉｃｕｌａｔｅｓｒｅｉｎｆｏｒｃｅｄａｌｕｍｉｎｕｍａｌｏｙｃｏｍｐｏｓｉｔｅｓｅｘｈｉｂｉｔｈｉｇｈｓｐｅｃｉｆｉｃｍｏｄｕｌｕｓａｎｄｓｔｒｅｎｇｔｈ，ａｌｓ... 详细信息

ＩＮＴＲＯＤＵＣＴＩＯＮＴｈｅｃｅｒａｍｉｃｐａｒｔｉｃｕｌａｔｅｓｒｅｉｎｆｏｒｃｅｄａｌｕｍｉｎｕｍａｌｏｙｃｏｍｐｏｓｉｔｅｓｅｘｈｉｂｉｔｈｉｇｈｓｐｅｃｉｆｉｃｍｏｄｕｌｕｓａｎｄｓｔｒｅｎｇｔｈ，ａｌｓｏｇｅｔａｓｉｇｎｉｆｉｃａｎｔｉ...

关键词： composite aluminum SiC wear particulate

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Effect of heat treatment on the microstructure,mechanical properties and fracture behaviors of ultra-high-strength SiC/Al-Zn-Mg-Cu composites

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International Journal of Minerals,Metallurgy and materials 2024年第10期31卷 2233-2243页

作者： Guonan ma Shize Zhu Dong Wang Peng Xue BolüXiao zongyi ma Shi-changxu Innovation Center for Advanced materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Centre of Excellence for Advanced materials Dongguan 523808China

A high-zinc composite,12vol%SiC/Al-13.3 Zn-3.27 Mg-1.07Cu(wt%),with an ultra-high-strength of 781 MPa was success-fully fabricated through a powder metallurgy method,followed by an extrusion *** effects of solid-solution and aging heat treat-ments on the microstructure and mechanical properties of the composite were extensively *** with a single-stage sol-id-solution treatment,a two-stage solid-solution treatment(470℃/1 h+480℃/1 h)exhibited a more effective solid-solution strengthen-ing owing to the higher degree of solid-solution and a more uniform *** to the aging hardness curves of the com-posite,the optimized aging parameter(100℃/22 h)was *** the aging temperature and time resulted in finer and more uniform nanoscale precipitates but only yielded a marginal increase in tensile *** fractography analysis revealed that intergranu-lar cracking and interface debonding were the main fracture mechanisms in the ultra-high-strength SiC/Al-Zn-Mg-Cu *** regions,such as the SiC/Al interface containing numerous compounds and the precipitate-free zones at the high-angle grain boundaries,were identified as significant factors limiting the strength enhancement of the *** compounds,including MgO,MgZn2,and Cu5Zn8,reduced the interfacial bonding strength,leading to interfacial debonding.

关键词： metal matrix composites heat treatment interfacial reaction mechanical properties fracture mechanism

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Friction stir welding of carbon nanotubes reinforced Al-Cu-Mg alloy composite plates

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Journal of materials Science & Technology 2017年第9期33卷 1004-1008页

作者： Ke Zhao Zhenyu Liu Bolyu Xiao zongyi ma Shenyang National Laboratory for materials Science Institute of Metal ResearchChinese Academy of Sciences

Carbon nanotubes(CNTs) reinforced Al-Cu-Mg composite plates of 2.2 mm in thickness after extrusion and T4 treatment were joined by friction stir welding(FSW) and the joint efficiency reaches 87%. There was no precipitate in both heat-affected zone(HAZ) and nugget zone(NZ) as a medium rotation rate of 800 rpm and a relative high travel speed of 100 mm min-1were used. In the NZ, FSW disarranged the alignment of CNTs to random orientation and dispersed CNT uniformly. The orientation of CNTs perpendicular to the tensile direction and the possible dissolution of solute clusters made the HAZ become the weakest zone in the joint leading to the failure in the HAZ.

关键词： Carbon nanotubes Metal matrix composites Friction stir welding

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Hardness, quench sensitivity, and electrical conductivity of 7xxx Al alloys with high Zn concentrations

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Science China(Technological Sciences) 2020年第6期63卷 953-959页

作者： PENG YingHao LIU ChongYu ma zongyi JIANG HongJie HUANG HongFeng Key Laboratory of New Processing Technology for Nonferrous Metal&materials Ministry of EducationGuilin University of TechnologyGuilin 541004China Institute of Metal Research Chinese Academy of SciencesShenyang 110016China

In this study,7 xxx(Al-Zn-Mg-Cu)alloys with high Zn concentrations were fabricated by increasing the Zn contents of 7085 Al *** hardness,quench sensitivity,and electrical conductivity of the alloys and a 7085 Al alloy under peak-aged state were *** high Zn concentration alloys had higherη′phase densities and lower quantities of Mg solid atoms than the 7085 Al alloy and thus exhibited higher hardness and electrical *** high Zn concentration alloys also exhibited slightly higher quench sensitivity than 7085 Al alloy,and the depth of the quenching layer of the alloy with 11.27 wt%Zn content reached 100 *** work confirmed that the novel 7 xxx alloy with high Zn concentration showed balanced performance,exhibiting enhanced hardness and conductivity and reasonable quench sensitivity compared with the 7085 commercial Al alloy.

关键词： Al alloy hardness quench sensitivity electrical conductivity

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Two-stage aging treatment to accelerate aging kinetics without impairing strength in B_4C/7A04Al composite

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Science China(Technological Sciences) 2024年第8期67卷 2485-2492页

作者： CHEN YunTao ma GuoNan ZHU ShiZe WANG Dong XIAO BoLv ma zongyi Shi-Changxu Innovation Center for Advanced materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China Centre of Excellence for Advanced materials Dongguan 523808China

Aging treatments are the key process to obtain satisfactory strength for 7xxxAl alloys and their composites. However, traditional single-stage(SS) aging is time-consuming to reach a peak strength condition. In this study, an efficient 120℃ + 160℃ two-stage(TS) aging treatment was proposed on a B_4C/7A04Al composite fabricated via powder metallurgy(PM) technology, which could acquire similar peak-aging strength but only took about 15% of the time compared to traditional 120℃ SS aging. The evolution of precipitation during the TS aging was investigated, as well as those of the 7A04Al alloys for comparison. In the second stage aging process, the higher aging temperature accelerated the nucleation of η′ phases inside the grains and thus increased the density of precipitates. Moreover, the short aging time limited the coarsening of precipitates and the broadening of precipitatefree zones. The above factors were beneficial for quickly obtaining satisfactory precipitation strengthening effects. The B_4C/7A04Al composite exhibited slower aging kinetics than the 7A04Al alloy in the TS aging. Mg elements consumption by the chemical reaction between B impurities introduced by B_4C particles and the Al matrix was considered to potentially retard the aging kinetics of the B_4C/7A04Al composite. Nevertheless, the precipitation sequence was not affected.

关键词： aluminum matrix composites aging treatment powder metallurgy mechanical properties precipitation

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Strengthening Mechanisms and Mechanical Characteristics of Heterogeneous CNT/Al Composites by Finite Element Simulation

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Acta Metallurgica Sinica(English Letters) 2024年第12期37卷 2106-2120页

作者： Hui Feng Shu Yang Shengyuan Yang Li Zhou Junfan Zhang zongyi ma School of Electromechanical and Automotive Engineering Yantai UniversityYantai264005China Shi-Changxu Innovation Center for Advanced materials Institute of Metal ResearchChinese Academy of SciencesShenyang110016China

The refined explicit finite element scheme considering various strengthening mechanisms and damage modes is proposed for simulation of deformation processes and mechanical properties of carbon nanotube(CNT)-reinforced bimodal-grained aluminum matrix ***,the detailed microstructure model is established by constructing the geometry models of CNTs and grain boundaries,which automatically incorporates grain refinement strengthening and load transfer ***,a finite element formulation based on the conventional theory of mechanical-based strain gradient plasticity is ***,the deformation and fracture modes for the nanocomposites with various contents and distributions of coarse grains(CGs)are explored based on the *** results indicate that ductility of the composites first increases and then decreases as the content of CGs ***,the dispersed distribution exhibits better ductility than concentrated ***,grain boundaries proved to be the weakest component within the micromodel.A series of interesting phenomena have been observed and discussed upon the refined simulation *** work contributes to the design and further development of CNT/Al nanocomposites,and the proposed scheme can be extended to various bimodal metal composites.

关键词： Mechanical properties Carbon nanotube(CNT) Bimodal metal matrix nanocomposites Refined explicit finite element simulation Microstructure design

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