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magnesium nanocomposites:An overview on time-dependent plastic(creep) deformation

Defence Technology（防务技术） 2019年第2期15卷 123-131页

作者： m.Haghshenas m.gupta Department of mechanical Engineering University of North Dakota Department of mechanical Engineering National University of Singapore

magnesium(mg) nanocomposites are created when nano-size particles are embedded into the mg(or mg alloy) matrix. The mg nanocomposites, cited as high-strength energy-saving materials of future, are a group of emerging materials with excellent combination of strength and ductility and superior specific strength property(strength-to-weight ratio). Having said this, mg nanocomposites are considered as promising replacement for other structural alloys(i.e. aluminum and titanium) wherever low density and high strength are required, i.e. transportation, aerospace, defense, etc. To be able to apply this group of materials for real components, different failure mechanisms at ambient and elevated temperatures under static and dynamic loading condition must be well documented. Compared with other metals and alloys,rate-dependent plastic deformation(creep), at ambient and elevated temperatures, of these novel materials is not yet well studied which seems a tangible lack of knowledge. This is required since the materials in service are often exposed to medium and elevated temperatures and/or static loads for long duration of time and this encourages creep failure on them. To this end, the information and the controlling mechanisms on time/temperature-dependent response of the material need to be developed to be able to predict the response of the mg nanocomposites where the materials are under creep conditions. This paper aims at providing an overview on(i) creep-resistant mg alloys(as matrix) and their chemical compositions, and(ii) responses of the mg nanocomposites at different creep conditions(time and temperature). The controlling mechanisms contributing to the strength and ductility of the mg nanocomposites due to the presence of the nanoparticles have been reviewed briefly in the present article. In this paper both traditional(uniaxial) and depth-sensing indentation creep of mg nanocomposites are reviewed. Also, some fundamental questions and possible explanations have be

关键词： mg nanocomposite Creep Strength Reinforcement Nanoparticles

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Hybridizing micro-Ti with nano-B_(4)C particulates to improve the microstructural and mechanical characteristics of mg-Ti composite

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Journal of magnesium and Alloys 2014年第1期2卷 13-19页

作者： S.Sankaranarayanan S.Jayalakshmi m.gupta Department of mechanical Engineering National University of Singapore(NUS)9 Engineering Drive 1Singapore 117576Singapore

In this study,the effects of hybridizing micron-sized titanium particles with nano-sized boron carbide particles on the microstructural and mechanical properties of mg-Ti composite were *** characterization revealed grain refinement attributed to the presence of uniformly distributed micro-Ti particles embedded with nano-B_(4)C *** back scattered diffraction(EBSD)analyses of the mg-(Ti+B_(4)C)Bm hybrid composite showed relatively more localized recrystallized grains and lesser tensile twin fraction,when compared to *** evaluation of mechanical properties indicated that the best combination of strength and ductility was observed in the mg-(Ti+B_(4)C)Bm hybrid *** superior properties of the mg-(Ti+B_(4)C)Bm hybrid composite when compared to mg-Ti can be attributed to the presence of nano-reinforcement,the uniform distribution of the hybridized particles and the better interfacial bonding between the matrix and the reinforcement particles achieved by nano-B_(4)C addition.

关键词： Composite materials Electron microscopy(SEm) Electron diffraction(electron back scattered diffraction) mechanical properties

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Experimental and numerical analyses of magnesium alloy hot workability

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Journal of magnesium and Alloys 2016年第4期4卷 295-301页

作者： F.Abbassi m.Srinivasan C.Loganathan R.Narayanasamy m.gupta mechanical engineering department college of engineeringdhofar universityp.o.box 2509211 salalahoman Urmssdt ensituniversity of tunis5 avenue taha husseinbp56bâb manara 1008tunisia Department of mechanical engineering chartered institute of technologyabu roadsirohirajasthan 307510india Department of production engineering national institute of technologytiruchirappallitamil nadu 620015india Department of mechanical engineering national university of singapore

Due to their hexagonal crystal structure,magnesium alloys have relatively low workability at room *** this study,the hot workability behavior of cast-extruded AZ31B magnesium alloy is studied through hot compression testing,numerical modeling and microstructural *** deformation tests are performed at temperatures of 250℃ to 400℃ under strain rates of 0.01 to 1.0 s^(−1).Transmission electron microscopy is used to reveal the presence of dynamic recrystallization(DRX),dynamic recovery(DRY),cracks and shear *** predict plastic instabilities during hot compression tests of AZ31B magnesium alloy,the authors use Johnson–Cook damage model in a 3D finite element *** optimal hot workability of magnesium alloy is found at a temperature(T)of 400℃ and strain rate(ε)of 0.01 s^(−1).Stability is found at a lower strain rate,and instability is found at a higher strain rate.

关键词： AZ31B magnesium alloy Hot workability Damage Plastic instability TEm analysis FEm

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Warranty and Preventive maintenance Analysis for Sustainable Reverse Supply Chains

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Journal of management Science and Engineering 2017年第1期2卷 69-94页

作者： Ammar Y.Alqahtani Surendra m.gupta Department of Industrial Engineering Faculty of EngineeringKing Abdulaziz UniversityJeddah 22254Saudi Arabia Department of mechanical and Industrial Engineering Northeastern University334 Snell Engineering Center360 Huntington AvenueBostonMA 02115USA

In addition to being environmentally friendly,remanufactured products are popular with consumers because they offer the latest technology at a lower price,in comparison to brand new ***,some consumers hesitate to buy remanufactured products because they are skeptical about their ***,they are unsure of the extent to which the product will render services when compared to a new product.A promotional marketing strategy employed by remanufacturers is to offer warranties for these *** that end,this study scrutinizes the impact of offering non-renewing warranties on remanufactured ***,in this paper,a methodology is suggested,which simultaneously minimizes the cost incurred by the remanufacturers and maximizes consumer confidence toward buying remanufactured *** study uses a discrete-event simulation to optimize the implementation of a two-dimensional non-renewing warranty policy for remanufactured *** implementation is illustrated using a specific product recovery system called the Advanced Remanufacturing-To-Order *** experiments in the study were designed using Taguchi’s Orthogonal Arrays to represent the entire domain of the recovery system to observe system behavior under various experimental conditions.

关键词： Preventive maintenance Warranty policies Remanufacturing Sensor embedded products Extending product life cycle Reverse supply chain One-dimensional warranty Non-renewable

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magnesium alloys as extremely promising alternatives for temporary orthopedic implants-A review

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Journal of magnesium and Alloys 2023年第8期11卷 2688-2718页

作者： C.A.Niranjan T.Raghavendra madhuri P.Rao C.Siddaraju m.gupta Vikram Kumar S.Jain R.Aishwarya Department of Industrial Engineering and management Ramaiah Institute of TechnologyBengaluru-54India Department of mechanical Engineering National Institute of EngineeringMysuru-08India Department of Chemistry B.M.S.College of EngineeringBengaluru-19India Department of mechanical Engineering Ramaiah Institute of TechnologyBengaluru-54India Department of mechanical Engineering NUS Singapore-75Singapore Department of metallurgical and materials Engineering Indian Institute of TechnologyMadras-36India

mg alloys are emerging as potential and very promising alternatives for replacing permanent metallic implant materials such as steels and titanium in applications where the implants need to be removed following healing through revision *** of mg alloys for implant application is seen as a game changer and mg alloys are almost perfect materials for the future in both engineering and biomedical *** review therefore focuses on highlighting significance of mg alloys in biomedical field and risks of using permanent metallic implants particularly when the implants are no longer required after the injury is *** this review,importance of orthopedic implants in present scenario,serious concern related to accidents that are causing permanent disabilities,demand in orthopedic implant market worldwide,potential applications of mg based materials and their compatibility in biological environment is presented and *** addition,degradation rate,major reactions associated with mg based materials and effect of alloying elements on implant performance are also discussed based on in-vivo *** advances in development of mg alloys through various techniques and their performance in in-vitro conditions are also *** ways to eliminate the limitations of mg alloys include alloying,melt purification,surface alterations,surface modifications,chemical treatment,secondary processing *** *** and opportunities for mg alloys to become ideal implant material is also addressed.

关键词： Accidents Fractures Burden of fracture magnesium Ultimate alternative Degradation rate Alloying melt purification Coating

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Effect of temperature and strain rate on compressive response of extruded magnesium nano-composite

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Journal of magnesium and Alloys 2015年第3期3卷 224-230页

作者： B.Selvam P.marimuthu R.Narayanasamy V.Senthilkumar K.S.Tun m.gupta Department of mechanical Engineering Mookambigai College of EngineeringPudukkottaiTamilnadu 622502India Syed Ammal Engineering College RamanathapuramTamilnadu 623502India Department of Production Engineering National Institute of TechnologyTiruchirappalliTamilnadu 620015India Department of mechanical Engineering National University of Singapore9 Engineering Drive 1Singapore 117576Singapore

The hot deformation behaviour of extruded magnesium-zinc oxide nano composite has been studied using hot compression *** test was conducted in the temperature range of 250-400℃ and in the strain rate range of 0.01 to 1.5 s^(−1).The processing map was obtained using the power dissipation efficiency with the functions of temperature and strain *** workability and instability domains were observed in the processing map for a nano *** optical microscopy(Om),scanning electron microscopy(SEm)and transmission electron microscopy(TEm)images were used to confirm the formation of dynamic recrystallization(DRX),dynamic recovery(DRY)and instability *** workability region of the composite was identified at a working temperature of 400℃ and the strain rate of 0.01 s^(−1) from the processing *** instability regions were observed at higher strain rates(>0.1 s^(−1))and temperatures(250-400℃).

关键词： metal matrix composites Powder metallurgy Processing map Strain rate Instability Nano-composite

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Sliding wear behaviour of AZ31B magnesium alloy and nano-composite

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Transactions of Nonferrous metals Society of China 2012年第1期22卷 60-65页

作者： m.SRINIVASAN C.LOGANATHAN m.KAmARAJ Q.B.NGUYEN m.gupta R.NARAYANASAmY Department of mechanical Engineering Saranathan College of EngineeringTiruchirappalliTamilnadu 620012India St.Jospeh's College of Engineering and Technology ThanjavurTamilnadu 613403India Department of metallurgical and materials Engineering Indian Institute of Technology MadrasChennaiTamilnadu 600036India Department of mechanical Engineering National University of Singapore9 Engineering Drive 1Singapore 117576Singapore Department of Production Engineering National Institute of TechnologyTiruchirappalliTamilnadu 620015India

AZ31B magnesium alloy and nano-composite were manufactured by hybrid casting process and hot extruded at 350 °C. The sliding wear behaviour of alloy and nano-composite was estimated at room temperature using the standard pin-on-disc wear test equipment. The tests were conducted under a normal load of 10 N at different sliding speeds ranging from 0.60 to 1.2 m/s for distance up to 2000 m. The wear mechanisms of the worn out surface were studied using SEm analysis. The influence of test parameters on wear rate of the pins was established using a linear regression model statistically. Compared with the AZ31B magnesium alloy, the nano-composite shows lower wear rates due to higher hardness improvement caused by the reinforcement. The wear mechanism appears to be a mix-up of ploughing, rows of furrows, delamination and oxidation.

关键词： AZ31B magnesium alloy nano composite wear mechanism

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蛋液加入淘汰羊肉和羊、鸡肉香肠中的试验

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肉类工业 1993年第8期 32-35页

作者： m.gupta 张孝若

淘汰的畜禽(母鸡和母羊)的肉,由于胶元和交联组织增加,通常是坚韧和发干的。很多研究人员都在试验充分利用淘汰的畜禽及其副产品,生产肉糜或乳化型产品。但像羊脂那样的硬脂,在乳化时难于扩散以致口感很差。据Locker建议,老山羊的膻味... 详细信息

淘汰的畜禽(母鸡和母羊)的肉,由于胶元和交联组织增加,通常是坚韧和发干的。很多研究人员都在试验充分利用淘汰的畜禽及其副产品,生产肉糜或乳化型产品。但像羊脂那样的硬脂,在乳化时难于扩散以致口感很差。据Locker建议,老山羊的膻味可通过去除其内部脂肪而消除之。

关键词：蛋羊肉鸡肉香肠

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Bibliographic survey and comprehensive review on mechanical and durability properties of microorganism based self-healing concrete

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Frontiers of Structural and Civil Engineering 2024年第9期18卷 1445-1465页

作者： md marghoobul HAQUE Kunal m.SHELOTE Namrata SINGH Supratic gupta Department of Civil Engineering Indian Institute of Technology DelhiNew Delhi 110016India

Concrete is the most widely utilized material for construction purposes,second only to water,in the ever-increasing need for construction *** is a brittle material and possesses a high risk of crack formation and consequent ***,which allows chemicals to enter and can cause concrete structures to lose their physico-mechanical and durability *** and rehabilitating concrete structures involves high costs and leads to various repair methods including coating,adhesives,polymers,supplementary cementitious materials(SCms),and *** of the latest technologies is the use of microorganisms in *** added microorganisms lead to calcite precipitation and thereby heal the cracks *** study presents a comprehensive literature survey on bacteria-included concrete,before which a bibliographic survey is performed using VOSViewer *** addition to regular bacterial concrete,this study focuses on also using SCms and fibers in bacterial concrete.A detailed literature review with data representation for various mechanical properties including compressive strength(CS),split tensile strength(SS),and flexure strength(FS),along with durability properties including carbonation,water absorption,resistance against chloride ion penetration,gas permeation,and resistance against cyclic freeze-and-thaw is presented.A study on the use of X-ray computed tomography(XCT)in bacterial concrete is highlighted,and the scope for future research,along with identification of the research gap,is presented.

关键词： bacterial concrete bibliographic survey biomineralization carbonation fibers

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Optimizing calcination of coal by-products for maximizing REE leaching recovery and minimizing Al,Ca,and Fe contamination

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Journal of Rare Earths 2024年第7期42卷 1354-1365,I0006页

作者： Tushar gupta Ahmad Nawab Rick Honaker mP materials mountain Pass mine 67750 Bailey RoadMountain PassCA92366USA Department of mining Engineering University of KentuckyLexingtonKY40506USA

High-temperature calcination is effective in improving the leaching characteristics of rare earth elements(REEs)from conventional REE-bearing minerals by transforming them into more leachable ***,the recovery of contaminants such as Al,Fe,and Ca also increases *** objective of the study was to maximize the REE extraction while minimizing the concentration of contaminant ions(Al,Ca,and Fe)in the leach *** density fractions of the coarse refuse from the Baker and Fire Clay seam coal refuse were pulverized to a top size of 180μm and used as a feedstock for the *** the samples generated from thermal treatment were leached at 1%(w/v)using 1.2 mol/L sulfuric acid at 75℃ for 2 *** results from a parametric program based on a Box-Behnken design were used for modeling and optimization of three operating parameters associated with the lab-scale calcination *** parameters included temperature(400-800℃),ramp rate(2-10℃/min)and holding time(0-120 min).It was determined that the calcination temperature was the most significant parameter influencing REE *** majority of the heavy rare earth elements(HREEs)were found to be present in an insoluble form in the calcination products and were marginally affected by thermal treatment.A strong correlation between light rare earth elements recovery(LREEs)and Al suggested a possible association with *** optimum operating conditions for high REE recovery with comparatively lower contaminant concentration for 1.6 specific gravity float and 2.2 sink fractions of Baker and Fire Clay seam material were determined to be at 776,800℃ and 407,800℃,calcining temperatures,respectively.A higher optimum temperature of 1.6 float fraction of Baker seam relative to Fire Clay seam material was due to elevated pyrite concentration in Baker seam *** treatment at 400℃ converted pyrite into a soluble intermedium iron oxide,resulting in a high Fe content in the ***

关键词： Calcination Optimization Rare earth elements Coal refuse

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