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| 1 | Simulations of deformation and damage processes of SiCp/Al composites during tension显示文摘The deformation, damage and failure behaviors of 17 vol.% SiCp/2009Al composite were studied by microscopic finite element(FE) models based on a representative volume element(RVE) and a unit cell. The RVE having a 3D realistic microstructure was constructed via computational modeling technique, in which an interface phase with an average thickness of 50 nm was generated for assessing the effects of interfacial properties. Modeling results showed that the RVE based FE model was more accurate than the unit cell based one. Based on the RVE, the predicted stress-strain curve and the fracture morphology agreed well with the experimental results. Furthermore, lower interface strength resulted in lower flow stress and ductile damage of interface phase, thereby leading to decreased elongation. It was revealed that the stress concentration factor of SiC was ~2.0: the average stress in SiC particles reached ~1200 MPa, while that of the composite reached ~600 MPa. | J.F.Zhang X.X.Zhang Q.Z.wang B.L.Xiao Z.Y.Ma | 2018 | Journal of Materials Science & Technology2018，34，4： | 8 |
| 2 | Microscopic stresses in carbon nanotube reinforced aluminum matrix composites determined by in-situ neutron diffraction显示文摘One of the most desired strengthening mechanisms in the carbon nanotube reinforced aluminum matrix composites(CNT/Al)composites is the load transfer strengthening mechanism(LTSM).However,a fundamental issue concerning the LTSM is that quantitative measurements of load partitioning in these composites during loading are very limited.In this study,in-situ neutron diffraction study on the tensile deformation of the 3 vol.%CNT/2009 Al composite and the unreinforced 2009 Al alloy was conducted.The{311}and{220}diffraction elastic constants(DECs)of the 2009 Al alloy were determined.Using those DECs the average stress in the 2009 Al matrix of the composite was calculated.Then the average stress in the CNTs was separated by using the stress equilibrium condition.Computational homogenization models were also applied to explain the stress evolution in each phase.Predicted results agree with experimental data.In the present case,the average stress in the CNTs reaches 1630 MPa at the yield strength of the composite based on linear regression of the measured data,which leads to an increment of yield strength by about 37 MPa.As the result of this work,an approach to quantify load partitioning in the CNTs is developed for the CNT/Al composites,which can be applied to optimize the mechanical properties of the composites. | X.X.Zhang J.F.Zhang Z.Y.Liu W.M.Gan M.Hofmann H.Andrä B.L.Xiao Z.Y.Ma | 2020 | Journal of Materials Science & Technology2020，54，19： | 4 |
| 3 | Evolution mechanisms of microstructure and mechanical properties in a friction stir welded ultrahigh-strength quenching and partitioning steel显示文摘Ultrahigh-strength quenching and partitioning(Q&P) steels have attracted strong interests in the auto manufactory,while the comprehensive understanding in the microstructure and mechanical behavior of their welded joints is highly needed to enrich their applications.In the present work,it is designed to make an insight into these imperative conundrums.Equal strength Q&P 1180 steel joints to parent metal were successfully fabricated via friction stir welding(FSW) technique under different parameters. Apparent hardening and softening were observed in stir zone(SZ) and heat-affected zone(HAZ) respectively,whose microstructures strongly depended on the peak temperature and cooling rate during welding.The formation of fresh martensite was the main mechanism for the SZ hardening,while the decomposition of metastable phases played key roles in the microhardness drop of the HAZ.A heat source zone-isothermal phase transition layer model was proposed to clarify the impregnability of the joint strength under parameter variation.The dual-phase structure,nano-carbide particles,tempered initial martensite,and ultrafine-grained ferrite synergistically improved the strain hardening ability of the HAZ,which eventually resulted in the equal strength FSW joints. | Z.W.Wang J.F.Zhang G.M.Xie L.H.Wu H.Zhang P.Xue D.R.Ni B.L.Xiao Z.Y.Ma | 2022 | Journal of Materials Science & Technology2022，，7： | 3 |
| 4 | A fast numerical method of introducing the strengthening effect of residual stress and strain to tensile behavior of metal matrix composites显示文摘Thermal residual stress and strain(TRSS)in particle reinforced metal matrix composites(PRMMCs)are believed to cause strengthening effects,according to previous studies.Here,the representative volume element(RVE)based computational homogenization technique was used to study the tensile deformation of PRMMCs with different particle aspect ratios(AR).The influence of TRSS was assessed quantitatively via comparing simulations with or without the cooling process.It was found that the strengthening effect of TRSS was affected by the particle AR.With the average strengthening effect of TRSS,a fast method of introducing the strengthening effect of TRSS to the tensile behavior of PRMMCs was developed.The new method has reduced the computational cost by a factor 2.The effect of TRSS on continuous fiber-reinforced metal matrix composite was found to have a softening-effect during the entire tensile deformation process because of the pre-yield effect caused by the cooling process. | J.F.Zhang X.X.Zhang H.Andrä Q.Z.Wang B.L.Xiao Z.Y.Ma | 2021 | Journal of Materials Science & Technology2021，，28： | 1 |
| 5 | Microstructure and corrosion resistance of plasma sprayed Fe-based alloy coating as an alternative to hard chromium显示文摘 | W.H.Lu Y.P.Wu J.J.Zhang S.Hong J.F.Zhang and G.Y.Li | | 0，，： | 1 |
| 6 | An effective approach for bonding of TZM and Nb-Zr system:Microstructure evolution,mechanical properties,and bonding mechanism显示文摘A novel method of liquid metallic film(LMF)bonding was developed to join titanium zirconium molybdenum alloy(TZM)and Nb-Zr alloy with a Ni interlayer.Using this method,a Ni-Zr liquid phase was formed by the eutectic reaction and then squeezed out from the gap due to a transient pressure,leaving an LMF.It not only achieved a reliable metallurgical bonding but also served as a transition layer between TZM and Nb-Zr alloy to reduce the mismatch between them thus further improving its performance.The bonding mechanism of the TZM and Nb-Zr system was discussed based on theoretical calculation and high-resolution microscopy analysis.The advantages of this method were established by comparing the microstructure and mechanical properties of LMF bonded joints with that of traditional contact-reaction brazing and direct diffusion bonding.Additionally,the feasibility of the LMF bonding method was also demonstrated by the reliable joining of other high-temperature and immiscible systems. | Z.W.Yang J.M.Lin J.F.Zhang Q.W.Qiu Y.Wang D.P.Wang J.Song | 2021 | Journal of Materials Science & Technology2021，，25： | 1 |
| 7 | Superb Strengthening Effect of Net-Like Distributed Amorphous Al_(2)O_(3)on Creep Resistance of(B_(4)C+Al_(2)O_(3))/Al Neutron-Absorbing Materials显示文摘B4C reinforced Al composites are widely used as neutron absorbing materials(NAMs)due to excellent neutron absorbing efficiency,however,such NAMs exhibit poor high-temperature properties.To meet the requirement for structure-function integration,NAMs with enhanced high-temperature mechanical properties are desired.In this work,a novel(B4 C+Al_(2)O_(3))/Al NAM with netlike distribution of Al_(2)O_(3)was fabricated by powder metallurgy method and subjected to high-temperature tensile creep test.It was shown that the creep resistance was enhanced by several orders of magnitude via the addition of only2.1 vol.%netlike-distributed Al_(2)O_(3).(B_(4)C+Al_(2)O_(3))/Al exhibited high apparent stress exponents ranging from 16 to 25 and high apparent activation energy of 364 kJ/mol.The creep behaviour could be rationalized using the substructure-invariant model and its rupture behaviour could be described by the Dobes-Milicka equation. | Y.N.Zan X.Lei J.F.Zhang D.Wang Q.Z.Wang B.L.Xiao Z.Y.Ma | 2022 | Acta Metallurgica Sinica(English Letters)2022，35，12： | 0 |
| 8 | Anisotropy of the Wear Behavior for Carbon Nanotube-Reinforced 6061Al Composites显示文摘Carbon nanotube(CNT)-reinforced 6061Al(CNT/6061Al)composites with directionally aligned CNT were fabricated,and their wear behavior was investigated.The results indicate that the wear properties of CNT/6061Al composites exhibited a significant anisotropy.A certain CNT concentrations(1 wt%and 2 wt%)could effectively improve the wear resistance of CNT/6061Al composites along the CNT circumferential and CNT radial directions for the load transfer,grain refinement and self-lubrication effect of CNT.The Brass{011}<211>and{112}<110>textures inhibited the load transfer effect of CNT along the CNT radial direction,resulting in a better wear resistance along CNT circumferential direction than CNT radial direction.Along the CNT axial direction,the weak deformability of composites caused by the intensifying<111>fiber texture was the main reasons for the poor wear resistance of CNT/6061Al composites with increasing CNT concentration. | X.N.Li J.F.Zhang W.H.Xue K.Ma P.Y.Li Z.Y.Liu B.L.Xiao D.R.Ni Q.Z.Wang D.Wang Z.Y.Ma | 2023 | Acta Metallurgica Sinica(English Letters)2023，36，5： | 0 |
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