scholarly journals Mechanical Behaviour and Corrosion Performance of Thin Film Magnesium WE Alloys

2011 ◽  
Vol 690 ◽  
pp. 286-289 ◽  
Author(s):  
Kristina Schlüter ◽  
Julia Reverey ◽  
Norbert Hort ◽  
Christiane Zamponi ◽  
Eckhard Quandt
Keyword(s):  
Thin Films ◽  
Mechanical Properties ◽  
Mechanical Behaviour ◽  
Corrosion Behaviour ◽  
Tensile Tests ◽  
Localized Corrosion ◽  
Nominal Composition ◽  
Corrosion Performance ◽  
Corrosion Tests ◽  
Deposition Conditions

Mg based thin films are of increasing interest due to the potential in varying the corrosion properties in comparison to bulk alloys of the same nominal composition. In this work the mechanical behaviour and the corrosion performance of sputtered thin films consisting of magnesium alloys with the compositions Mg4Y3Gd and Mg4Y3Nd were investigated by tensile tests and electrochemical corrosion tests, respectively. The tensile tests showed that the sputtering parameters have an enormous influence on the mechanical properties of the thin films. By variation of the Ar sputtering pressure and the DC sputtering power it was possible to fabricate films with widely varying mechanical behaviour reaching from brittle to very ductile films which could be strained to more than 30%. The determined dependency between mechanical properties and deposition conditions was found to be present in both investigated alloys. The corrosion tests revealed that the corrosion behaviour of the investigated samples is not correlated to the mechanical properties of the thin films, as the rate of corrosion and the tendency to localized corrosion do not change significantly upon the deposition conditions, which dramatically influence the mechanical properties.

The tensile behaviour of biaxial and triaxial braided fabrics

2016 ◽  
Vol 47 (8) ◽  
pp. 2184-2204 ◽  
Author(s):  
Duchamp Boris ◽  
Legrand Xavier ◽  
Soulat Damien
Keyword(s):  
Mechanical Properties ◽  
Experimental Study ◽  
Mechanical Behaviour ◽  
Tensile Tests ◽  
Uniaxial Tensile ◽  
Tensile Behaviour ◽  
Linear Mass ◽  
Double Peak ◽  
Specific Behaviour ◽  
Braiding Angle

The tensile behaviour of braid reinforcement is classically described by the behaviour of composite elaborated from these reinforcements. Few studies concern the tensile behaviour of braided fabrics. In this paper biaxial and triaxial braids are manufactured on a braiding loom. The evolution of key parameters as linear mass and braiding angle in function of process parameters is presented. Braid reinforcements are characterized in uniaxial tensile. The mechanical behaviour is analysed and compared in function of the braiding angle, but also different kinds of braid are considered. A specific behaviour called “double-peak” is identified for triaxial braids which have a higher braiding angle. The evolution of the braiding angle measured during tensile tests gives a comprehension on the mechanical behaviour of dry braids. Associated with this experimental study, an analytical model is also proposed, to predict mechanical properties of braid reinforcements.

scholarly journals Механизмы возникновения напряжений в тонких пленках и покрытиях

2020 ◽  
Vol 90 (12) ◽  
pp. 1971
Author(s):  
А.Р. Шугуров ◽  
А.В. Панин
Keyword(s):  
Thin Films ◽  
Mechanical Properties ◽  
Chemical Composition ◽  
Phase Transformations ◽  
Stress Generation ◽  
Amorphous Films ◽  
Misfit Stress ◽  
Crystal Lattices ◽  
Generation Mechanisms ◽  
Deposition Conditions

The paper considers current conceptions of generation of mechanical stresses in epitaxial, polycrystalline and amorphous films during their growth and under different external actions. The mechanism of stress generation in geteroepitaxial films due to misfit in crystal lattices of the film and substrate is described. The relation between arising of the misfit stress in heterostructures and variation of their growth mode is shown. The mechanisms of generation of compressive and tensile stresses in polycrystalline films caused by nucleation and coalescence of islands at the beginning of their growth are considered. Different aspects of evolution of intrinsic stresses in continuous films are discussed in dependence of their deposition conditions, chemical composition, microstructure and mechanical properties. Special attention is given to consideration of generation mechanisms of intrinsic stresses in thin films concerned with formation of pint defects, incorporation of impurities and phase transformations during deposition. Factors leading to arising extrinsic stresses in thin films during their storage and operation are described in details.

scholarly journals Effect of Sr and Ti Addition on the Corrosion Behaviour of Al-7Si-0.3Mg Alloy

2017 ◽  
Vol 17 (2) ◽  
pp. 125-130 ◽  
Author(s):  
M. Uludağ ◽  
M. Kocabaş ◽  
D. Dışpınar ◽  
R. Çetin ◽  
N. Cansever
Keyword(s):  
Mechanical Properties ◽  
Corrosion Resistance ◽  
Corrosion Rate ◽  
Potentiodynamic Polarization ◽  
Corrosion Test ◽  
Corrosion Behaviour ◽  
Tensile Tests ◽  
Nacl Solution ◽  
Cyclic Potentiodynamic Polarization ◽  
Ti Addition

AbstractIn the present study, the corrosion behaviour of A356 (Al-7Si-0.3Mg) alloy in 3.5% NaCl solution has been evaluated using cyclic/potentiodynamic polarization tests. The alloy was provided in the unmodified form and it was then modified with AlTi5B1 for grain refinement and with AlSr15 for Si modifications. These modifications yield to better mechanical properties. Tensile tests were performed. In addition, bifilm index and SDAS values were calculated and microstructure of the samples was investigated. As a result of the corrosion test, the Ecorr values for all conditions were determined approximately equal, and the samples were pitted rapidly. The degassing of the melt decreased the bifilm index (i.e. higher melt quality) and thereby the corrosion resistance was increased. The lowest corrosion rate was founded at degassing and as-received condition (3.9x10-3mm/year). However, additive elements do not show the effect which degassing process shows.

scholarly journals Transformation and Mechanical Properties of TiNi Thin Films Sputter Deposited at Various Argon Pressures for Micromachine Actuators

1999 ◽  
Vol 11 (4) ◽  
pp. 258-262
Author(s):  
Seiji Shimizu ◽  
◽  
Katsutoshi Kuribayashi
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Mechanical Properties ◽  
Differential Scanning Calorimetry ◽  
Shape Memory Alloy ◽  
Room Temperature ◽  
Tensile Tests ◽  
Alloy Thin Film ◽  
Scanning Calorimetry ◽  
Sputter Deposited

We studied the transformation and mechanical properties of Ti- 54.8-51.6 at % Ni shape memory alloy thin film actuators sputter-deposited at different argon pressures of 0.47-3.4 Pa. The higher the argon pressure, the lower the nickel composition. TiNi thin films were crystallized at 800C for 10min, aged at 400C for 6h, and analyzed by differential scanning calorimetry and tensile tests. All films showed 2-step transformation of martensite, R, and austenite phases. The maximum generative stress of 365MPa was obtained when the TiNi thin film actuator deposited at 2.0Pa was heated electrically to 30A/mm2 after deformation of 3.0% at room temperature.

Mechanical properties and corrosion behaviour of freestanding, precipitate-free magnesium WE43 thin films

2013 ◽  
Vol 104 (3) ◽  
pp. 286-292 ◽  
Author(s):  
Kristina Schlüter ◽  
Christiane Zamponi ◽  
Julia Hapke ◽  
Norbert Hort ◽  
Karl Ulrich Kainer ◽  
...  
Keyword(s):  
Thin Films ◽  
Mechanical Properties ◽  
Corrosion Behaviour ◽  
Mechanical Properties And Corrosion ◽  
Free Magnesium

Effect of Grain Structure on the Mechanical and Corrosion Behavior of Advanced Medium Mn Stainless TWIP Steel

2020 ◽  
Vol 998 ◽  
pp. 15-20 ◽  
Author(s):  
Mahmoud H.A. Gadelhaq ◽  
Atef S. Hamada ◽  
Ibrahim M. Ghayad ◽  
Antti Järvenpää ◽  
Matias Jaskari ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Stainless Steel ◽  
Twip Steel ◽  
Electron Backscatter Diffraction ◽  
Corrosion Behaviour ◽  
Cold Deformation ◽  
Tensile Tests ◽  
Grain Structure ◽  
Recrystallization Annealing ◽  
Significant Deterioration

The influence of recrystallization annealing on the microstructure, mechanical properties and corrosion behaviour of an austenitic TWIP steel bearing medium Mn and V alloying was investigated. The steel undergone a heavy cold deformation of 65 % reduction. Subsequently, recrystallization annealing at 1000 °C and 1100 °C for 15 min was conducted to achieve different grain structures. The microstructural evolution was studied using optical microscopy and electron backscatter diffraction technique. Mechanical properties were determined using tensile tests at room temperature. Corrosion behaviour was measured by cyclic potentiodynamic polarization at 3.5 pct NaCl. For comparison, austenitic stainless-steel Type 201 was used in this study. It was observed that at 1000 °C, a non-uniform austenitic grain structure with vanadium carbides distributed throughout the matrix was obtained. However, a coarse grain structure without carbides was induced at 1100 °C. The fine-grained structure enhanced at 1000 °C exhibited higher strength and good ductility. Contrary to this, the corrosion results showed that a significant deterioration in the corrosion resistance could be observed in sodium chloride solution for the achieved structure at 1000 °C compared to 201 stainless steel.

Influence of 3D warp interlock fabrics parameters made with flax rovings on their final mechanical behaviour

2018 ◽  
Vol 49 (9) ◽  
pp. 1123-1144 ◽  
Author(s):  
Anne-Clémence Corbin ◽  
François Boussu ◽  
Manuela Ferreira ◽  
Damien Soulat
Keyword(s):  
Mechanical Properties ◽  
Composite Material ◽  
Mechanical Behaviour ◽  
Three Dimensional ◽  
Tensile Tests ◽  
Shear Tests ◽  
Plane Shear ◽  
Static Tensile ◽  
Woven Structures ◽  
Weaving Loom

The three-dimensional weaving process enables to produce near-net shaped complex preforms used as reinforcement of composite materials. However, the lack of knowledge on the mechanical behaviour of these three-dimensional woven structures may restrict their use for composite material. To fill this gap, we have tempted to highlight their specific mechanical properties according to their endogenous parameters. Based on these different architectures produced on the same weaving loom, several non-impregnated coupons have been mechanically characterized in all the directions of the three-dimensional warp interlock fabrics with quasi-static tensile tests in warp and weft directions as well as in-plane shear tests. According to our analyses, it has been revealed that the combination of several parameters as the woven pattern, the end and pick densities and the presence or not of stuffer warp yarns inside the three-dimensional fabrics may significantly influence the mechanical behaviour of the three-dimensional warp interlock architectures.

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