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Effect of Cu addition on overaging behaviour,room and high temperature tensile and fatigue properties of A357 alloy

Transactions of Nonferrous Metals Society of China 2020年第11期30卷 2861-2878页

作者： Lorella CESCHINI Simone MESSIERI Alessandro MORRI Salem SEIFEDDINE Stefania TOSCHI Mohammadreza ZAMANI Department of Industrial Engineering(DIN) Alma Mater StudiorumUniversity of BolognaViale Risorgimento 440136 BolognaItaly Ducati Motor Holding Via Cavalieri Ducati Antonio 340132 BolognaItaly Department of Materials and Manufacturing School of EngineeringJönköping UniversityGjuterigatan 555111 JönköpingSweden Department of Civil ChemicalEnvironmental and Materials Engineering(DICAM)Alma Mater StudiorumUniversity of BolognaViale Risorgimento 4BolognaItaly

The aims of the present work are to evaluate the overaging behaviour of the investigated Cu-enriched alloy and to assess its mechanical behaviour,in terms of the tensile and fatigue strength,at room temperature and at 200℃,and to correlate the mechanical performance with its microstructure,in particular with the secondary dendrite arm spacing(SDAS).The mechanical tests carried out on the overaged alloy at 200℃ indicate that the addition of about 1.3 wt.%Cu to the A357 alloy enables to maintain ultimate tensile strength and yield strength values close to 210 and 200 MPa,respectively,and fatigue strength at about 100 *** to the quaternary(Al−Si−Cu−Mg)alloy C355,the A357−Cu alloy has greater mechanical properties at room temperature and comparable mechanical behaviour in the overaged condition at 200℃.The microstructural analyses highlight that SDAS affects the mechanical behaviour of the peak-aged A357−Cu alloy at room temperature,while its influence is negligible on the tensile and fatigue properties of the overaged alloy at 200℃.

关键词： A357 alloy C355 alloy Al−Si−Cu−Mg casting alloy tensile property fatigue behaviour high temperature overaging

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fatigue behavior of high-entropy alloys： A review

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Science China(Technological Sciences) 2018年第2期61卷 168-178页

作者： CHEN PeiYong LEE Chanho WANG Shao-Yu SEIFI Mohsen LEWANDOWSKI John J DAHMEN Karin A JIA HaoLing XIE Xie CHEN BiLin YEH Jien-Wei TSAI Che-Wei YUAN Tao LIAW Peter K Department of Materials Science and Engineering The University of TennesseeKnoxville 37996，USA Department of Materials Science and Engineering Case Western UniversityCleveland 44106USA Department of Physics University of IllinoisUrbana 61801USA Department of Materials Science and Engineering 'National' Tsing Hua UniversityHsinchu 30013，Taiwan，China Department of Industry and System Engineering Ohio UniversityAthens 45701，USA

fatigue failures cost approximately 4% of the United States' gross domestic product(GDP). The design of highly fatigue-resistant materials is always in demand. Different from conventional strategies of alloy design, high-entropy alloys(HEAs) are defined as materials with five or more principal elements, which could be solid solutions. This locally-disordered structure is expected to lead to unique fatigue-resistant properties. In this review, the studies of the fatigue behavior of HEAs during the last five years are summarized. The four-point-bending high-cycle fatigue coupled with statistical modelling, and the fatigue-crack-growth behavior of HEAs, are reviewed. The effects of sample defects and nanotwins-deformation mechanisms on four-point-bending high-cycle fatigue of HEAs are discussed in detail. The influence of stress ratio and temperature on fatigue-crack-growth characteristics of HEAs is also discussed. HEAs could exhibit comparable or greater fatigue properties, relative to conventional materials. Finally,the possible future work regarding the fatigue behavior of HEAs is suggested.

关键词： high-entropy alloys fatigue behaviour statistical modelling fatigue crack growth

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Effect of post weld heat treatment on properties of variable polarity TIG welded AA2219 aluminium alloy joints

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Transactions of Nonferrous Metals Society of China 2014年第5期24卷 1307-1316页

作者：丁吉坤王东坡王颖杜辉天津大学材料科学与工程学院天津300072 天津市现代连接技术重点实验室天津300072

AA2219 aluminium alloy joints were fabricated by variable polarity tungsten inert gas （VPTIG） welding process and the effects of post weld heat treatment （PWHT） on the tensile properties, microstructure and fatigue behaviour of the welded joints were investigated. The VPTIG welding process was adopted because it could meet the need of cathode cleaning and meanwhile it could reduce the deterioration of tungsten electrode furthest. The welded samples were divided into as-welded （AW） sample and PWHT sample. The PWHT method used on the samples was solution treatment （535 ℃, 30 rain）, water quenching and artificial aging （175 ℃, 12 h）. The experimental results show that, compared with the AW samples, the microstructure characteristics and mechanical properties of the AA2219 joints after PWHT were significantly improved. The improvement of yield strength, ultimate tensile strength, and fatigue strength are 42.6%, 43.1% and 18.4%, respectively.

关键词： AA2219 aluminium alloy variable polarity TIG post weld heat treatment mechanical properties microstructure fatigue behaviour

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On Fabrication and Mechanical Performance of Smart Composites Incorporating Fiber Optic Sensors

On Fabrication and Mechanical Performance of Smart Composite...

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第十三届国际复合材料会议

作者： AlexanderL.Kalamkarov Department of Mechanical Engineering Dalhousie University P.O. Box 1000 Halifax Nova Scotia B3J 2X4 Canada

＜正＞The potential for the use of composite materials in the fields of civil engineering, transportation and marine engineering is very promising. High strength-to-weight ratios and inherent corrosion resistance are among the properties that make composites attractive for these applications. The introduction of composite materials in these areas has been slowed by the high cost of most composites and a lack of reliable long-term data as compared to more traditional materials such as steel and concrete. One method of compensating for the lack of long-term data is to monitor the health of the structure using smart composite materials. The smart materials discussed here are pultruded FRP reinforcing rods with embedded fiber optic strain sensors.

关键词： CFRP/GFRP smart tendons pultrusion fiber optic sensors reliability study fatigue behaviour creep behaviour alkaline environments

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