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Effects of SiC Nanoparticle Content on the Microstructure and tensile mechanical properties of Ultrafine Grained AA6063-SiC_(np) Nanocomposites Fabricated by Powder Metallurgy

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Journal of Materials Science & Technology 2017年第9期33卷 1023-1030页

作者： X.Yao Z.Zhang Y.F.Zheng C.Kong M.Z.Quadir J.M.Liang Y.H.Chen P.Munroe D.L.Zhang State Key Laboratory of Metal Matrix Composites School of Materials Science and EngineeringShanghai Jiao Tong University Electron Microscope Unit University of New South Wales School of Materials Science and Engineering University of New South Wales

Ultrafine grained AA6063-SiCnpnanocomposites with 1, 5 and 10 vol.% SiCnphave been fabricated by a novel powder metallurgy process. This process combines high energy ball milling of a mixture of 6063 alloy granules made from machining chips and Si C nanoparticles and thermomechanical powder consolidation by spark plasma sintering and hot extrusion. The microstructure and tensile mechanical properties of the samples were investigated in detail. Increasing the Si C nanoparticle content from 1 to 10 vol.%,the yield strength and ultimate tensile strength increased from 296 and 343 MPa to 545 and 603 MPa respectively, and the elongation to fracture decreased from 10.0%, to 2.3%. As expected, a higher Si C nanoparticle content generates a stronger inhibiting effect to grain growth during the thermomechanical powder consolidation process. Analysis of the contributions of various strengthening mechanisms shows that a higher Si C nanoparticle content leads to a higher contribution from nanoparticle strengthening, but grain boundary strengthening still makes the largest contribution to the strength of the *** the Si C nanoparticle content increased to 10 vol.%, the failure of the nanocomposite was initiated at weakly-bonded interparticle boundaries(IPBs), indicating that with a high flow stress during tensile deformation, the failure of the material is more sensitive to the presence of weakly-bonded IPBs.

关键词： Metal matrix nanocomposite Ultrafine grained material Powder metallurgy tensile mechanical properties

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Effects of Steaming on the tensile mechanical properties of Cashmere Fiber

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Journal of Donghua University(English Edition) 2003年第2期20卷 45-47页

作者：侯秀良王善元 College of Textiles Donghua University Shanghai 200051 College of Textiles Donghua University Shanghai 200051he cashmere yarns were set in steam of 120℃for 5 minutes after they had been extended to about 3% and wrapped onto the glass mandrels which was relevant to the industrial setting processes. The effects of the steaming on the tensile mechanical properties of cashmere fiber are investigated. The extension in " yield region" and the extension at rupture of the set cashmere fiber are obviously decreased.

The cashmere yarns were set in steam of 120℃ for 5 minutes after they had been extended to about 3% and wrapped onto the glass mandrels, which was relevant to the industrial setting processes. The effects of the steaming on the tensile mechanical properties of cashmere fiber are investigated. The extension in ' yield region' and the extension at rupture of the set cashmere fiber are obviously decreased.

关键词： set steaming tensile mechanical properties cashmere

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Microstructure,interfacial reaction behavior,and mechanical properties of Ti_3AlC_(2)reinforced Al6061 composites

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Transactions of Nonferrous Metals Society of China 2024年第9期34卷 2756-2771页

作者： Zhi-bin LIU Jia-bao BAO Wen-jie HU Hong YAN School of Advanced Manufacturing Nanchang UniversityNanchang 330031China Jiangxi Vocational and Technical College of Communications Nanchang 330013China

The interfacial reaction behavior of Al and Ti_3AlC_(2)at different pouring temperatures and its effect on the microstructure and mechanical properties of the composites were *** results show that the addition of3.0 wt.%Ti_3AlC_(2)refines the average grain size ofα(Al)in the composite by 50.1%compared to Al6061 *** analyses indicate that an in-situ Al_(3Ti)transition layer of-180 nm in thickness is generated around the edge of Ti_3AlC_(2)at 720℃,forming a well-bonded Al-Al_(3Ti)*** this processing temperature,the ultimate tensile strength of A16061-3.0 wt.%Ti_3AlC_(2)composite is 199.2 MPa,an improvement of 41.5%over the Al6061 *** analyses further elucidate that 720℃is favourable for forming the nano-sized transition layer at the Ti_3AlC_(2)***,the thermal mismatch strengthening plays a dominant role in this state,with a strengthening contribution of about 74.8%.

关键词： Al6061 composites Ti3AlC2 microstructure interfacial reaction tensile mechanical properties

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A potential candidate structural material for molten salt reactor:ODS nickel-based alloy

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Journal of Materials Science & Technology 2022年第14期109卷 129-139页

作者： Cheng Li Guanhong Lei Jizhao Liu Awen Liu CLRen Hefei Huang Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China School of Nuclear Science and Technology University of Chinese Academy of SciencesBeijing 100049China School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China

The commercialisation of molten salts reactors(MSRs)is hindered by the lack of structural materials capable of withstanding the corrosive environment *** address this problem,we herein prepared1 wt%Y_(2)O_(3)mdispersion-strengthened Ni Mo-based alloys using powder metallurgy and evaluated their potential as structural materials for MSRs based on their mechanical properties,He swelling behaviour,and molten salt corrosion *** view of the strengthening provided by homogenously dispersed Y_(2)O_(3)particles,all NiMo-Y_(2)O_(3)samples exhibited ultimate tensile strengths and yield strengths exceeding those of the Hastelloy N alloy,a state-of-the-art structural material for ***,the volume fraction of He bubbles in the NiMo-Y_(2)O_(3)samples(~0.3%)was lower than that in the Hastelloy N alloy(0.58%),which showed that the introduction of Y_(2)O_(3)nanoparticles effectively inhibited He *** NiMo-Y_(2)O_(3)samples showed excellent resistance to molten salt corrosion(as reflected by the absence of obvious holes therein),thus holding great promise for the development of irradiation-and molten salt corrosion-resistant structural materials for high-temperature MSRs.

关键词： Molten salt reactor ODS nickel-based alloy Powder metallurgy tensile mechanical properties Helium swelling resistance Molten salt corrosion

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tensile behaviors of fatigued AZ31 magnesium alloy

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Transactions of Nonferrous Metals Society of China 2018年第5期28卷 896-901页

作者： Yang SHU Xi-yan ZHANG Jiang-ping YU Li TAN Rui-sen YIN Qing LIU School of Materials Science and Engineering Chongqing University Chongqing 400030 China

The relationship between microstructure and tensile behaviors of fatigued AZ31 magnesium alloy was investigated. Axial fatigue tests were performed on PLG-100 fatigue machine at stresses of 50 and 90 MPa. tensile samples were cut from the fatigued samples, named as L-sample and H-sample respectively, and the O-sample was cut from original rolled AZ31 alloy. The EBSD and TEM were used to characterize the microstructure. It is found that the twinning-detwinning was the main deformation mechanism in high stress fatigue test, while dislocation slipping was dominant in low stress fatigue test. After fatigue tests, the average grain size of the L-sample and H-sample decreased to 4.71 and 5.33 μm, and the tensile and yield strength of the L-sample and H-sample increased slightly. By analyzing SEM images, the ultimate fracture region of the L-sample consisted of dimples, while there were many microvoids in the ultimate fracture region of the H-sample. Consequently, the tensile behaviors of fatigued magnesium have a close relationship with microstructure.

关键词： AZ31 magnesium alloy fatigue tensile mechanical properties fracture morphology microstxucture

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