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Items from 1 to 20 out of 51 results

article

Non-contact method for measuring deformation in testing selected materials used in road construction

Jarosław Górszczyk, Konrad Malicki

Roads and Bridges - Drogi i Mosty > 2023 > Vol. 22, no. 4 > 423--432

High requirements for materials used in road construction make it necessary to use modern methods for assessing the mechanical parameters of these materials. One such method is the Digital Image Correlation (DIC) method. The paper presents the possibilities of using the non-contact DIC method to measure deformation in testing selected mechanical properties of asphalt mixture samples and a composite...

article

On the bulk glass formation in the ternary Pd-Ni-S system

Alexander Kuball, Benedikt Bochtler, Oliver Gross, Victor Pacheco, more

Acta Materialia > 2018 > 158 > C > 13-22

We report on the formation of bulk metallic glasses in the ternary Pd-Ni-S system. In a large compositional range, glass formation is observed by copper mold casting with a glass forming ability of up to 2 mm in diameter for the composition Pd₃₇Ni₃₇S₂₆. The best compromise of thermal stability upon heating from the as-cast state and glass forming ability was found for Pd₃₁Ni₄₂S₂₇, having a critical...

article

Evaluation of mechanical properties in medium carbon steel with a point mode electromagnetic sensor

Cunfu He, Yan Huang, Xiucheng Liu, Bin Wu

Sensors and Actuators A: Physical > 2018 > 269 > C > 126-136

This paper reports the evaluation of mechanical properties of medium carbon steel based on a novel sensor. The novel point mode electromagnetic sensor with compact configuration and concentrated magnetic flux characteristics has attracted wide attention in recent years. The point mode electromagnetic sensor consists of exciting coil, receiving coil and needle permalloy core embedded into the coil...

article

Hierarchical heterogeneity and an elastic microstructure observed in a metallic glass alloy

Peter Tsai, Kelly Kranjc, Katharine M. Flores

Acta Materialia > 2017 > 139 > C > 11-20

Heterogeneities in a Zr-based bulk metallic glass (BMG) were investigated using dynamic modulus mapping on a nanoindentation platform, revealing a complex elastic microstructure consisting of interpenetrating locally stiff and compliant regions with characteristic feature lengths on the order of 100 nm. The unique microstructures were observed in as-cast, annealed and laser-processed materials. Surprisingly,...

article

The influence of surface oxides on the mechanical response of oxidized grain boundaries

Judith Dohr, David E.J. Armstrong, Edmund Tarleton, Thierry Couvant, more

Thin Solid Films > 2017 > 632 > C > 17-22

The mechanical response of oxidized grain boundaries in a nickel alloy used for nuclear applications has been investigated by performing microcantilever bend tests. It was found that whilst failure can proceed along the oxide-metal interface not all oxidized grain boundaries exhibit intergranular failure. The presence of an external surface oxide has been identified as playing a crucial role in influencing...

article

Design, Manufacture, and Quasi-Static Testing of Metallic Negative Stiffness Structures within a Polymer Matrix

S . Cortes, J. Allison, C. Morris, M. R. Haberman, more

Experimental Mechanics > 2017 > 57 > 8 > 1183-1191

A composite material system comprised of a monostable negative stiffness (NS) structure within a polymer matrix was designed, fabricated, and experimentally evaluated. The monostable negative stiffness (NS) structure was designed using a combination of analytical and numerical models and manufactured in stainless steel. The NS structure was arranged in parallel with different polymer matrices to experimentally...

article

Microscopic incompatibility controlling plastic deformation of bicrystals

Nousha Kheradmand, Alain Franz Knorr, Michael Marx, Yun Deng

Acta Materialia > 2016 > 106 > C > 219-228

Grain boundary (GB) resistance to slip transmission was investigated computationally and experimentally as a function of GB type. A geometry-based computational method quantified the microscopic incompatibility of two GBs: one high angle GB (HAGB) with elastic and plastic incompatibility and one low angle GB (LAGB) with elastic and plastic compatibility. Compression tests of bicrystalline micropillar...

article

The local strength of microscopic alumina reinforcements

Goran Žagar, Václav Pejchal, Martin G. Mueller, Andreas Rossoll, more

Acta Materialia > 2015 > 100 > C > 215-223

We measure, using an adaptation of a method designed for ceramic ball bearings, the local strength of a brittle second phase that serves to reinforce a metal. The method uses focused ion beam milling and a nanoindentation device, and is free of artifacts commonly present in micromachined specimens. It is demonstrated on Nextel 610™ nanocrystalline alumina fibers embedded in an aluminum matrix composite...

article

Deformation behaviour and material properties of austenitic heat-resistant steel X15CrNiSi25-20 subjected to high temperatures and creep

Josip Brnic, Goran Turkalj, Marko Canadija, Sanjin Krscanski, more

Materials and Design > 2015 > 69 > Complete > 219-229

This paper presents experimental results and analysis of the behaviour of heat-resistant austenitic steel (X15CrNiSi25-20) subjected to uniaxial stress at room and high temperatures. The results include stress–strain diagrams as well as creep curves showing the behaviour of material responses to different temperatures. The experimental results of Charpy impact energies provide the ability to asses...

article

Quench-induced precipitates in Al–Si alloys: Calorimetric determination of solute content and characterisation of microstructure

Philipp Schumacher, Stefan Pogatscher, Marco J. Starink, Christoph Schick, more

Thermochimica Acta > 2015 > 602 > Complete > 63-73

The present study introduces an experimental approach to investigate mechanical properties of well-defined non-equilibrium states of Al–Si alloys during cooling from solution annealing. The precipitation behaviour of binary Al–Si alloys during the cooling process has been investigated in a wide cooling rate range (2–0.0001K/s) with differential scanning calorimetry (DSC). To access the low cooling...

article

A new Methodology to Predict Yield Strength Under Biaxial pre-Deformation on Sheet Metals

I. I. Cuesta, J. M. Alegre, D. Gutiérrez, D. Casellas

Experimental Mechanics > 2015 > 55 > 2 > 341-347

The use of stamped aluminium alloy components in the automotive industry is commonplace nowadays. To design these components correctly, it is necessary to know how the mechanical properties of sheet metals change when the material is deformed, generally under biaxial strain. In this paper, the influence of the pre-deformation on yield strength in an aluminium alloy 5000 series is studied from a new...

article

Grain-boundary cation diffusion in ceria tetragonal zirconia determined by constant-strain-rate deformation tests

Santiago de Bernardi-Martín, Bibi Malmal Moshtaghioun, Diego Gómez García, Arturo Domínguez-Rodríguez

Journal of the European Ceramic Society > 2014 > 34 > 16 > 4469-4472

Ceria tetragonal zirconia polycrystals with a content of 12mol% ceria (CeTZP) have been tested in compression at constant strain rate between 1150°C and 1300°C. An accurate analysis of the stress–strain curves has permitted to determine the value of the grain boundary cation diffusion. The results are compared with those reported in literature for this alloy and yttria tetragonal zirconia polycrystals...

article

Influence of secondary warm rolling on the interface microstructure and mechanical properties of a roll-bonded three-ply Al/Mg/Al sheet

K.S. Lee, Y.S. Lee, Y.N. Kwon

Materials Science & Engineering A > 2014 > 606 > Complete > 205-213

We investigated the influence of annealing and secondary warm rolling on the microstructural evolution and mechanical properties of a roll-bonded three-ply Al/Mg/Al sheet. After annealing at 300°C, the formation of an intermetallic compound (IMC) layer consisting of Mg ₁₇ Al ₁₂ and Mg ₂ Al ₃ was identified at the interface. Although the thickness of the IMC layer increased...

article

Microscale-calibrated modeling of the deformation response of dual-phase steels

Peng Chen, Hassan Ghassemi-Armaki, Sharvan Kumar, Allan Bower, more

Acta Materialia > 2014 > 65 > C > 133-149

A combination of micropillar compression tests and microstructure-based numerical simulations were used to determine the flow strength and strain rate partitioning in uniaxial tension in two commercial low-carbon dual-phase sheet steels, DP980 (0.09% C–2.15% Mn–0.60% Si (wt.%)) and DF140T (0.15% C–1.45% Mn–0.30% Si (wt.%)). The two steels have different microstructures, with the martensite volume...

article

Influence of reduction ratio on the interface microstructure and mechanical properties of roll-bonded Al/Cu sheets

K.S. Lee, S.E. Lee, H.K. Sung, D.H. Lee, more

Materials Science & Engineering A > 2013 > 583 > Complete > 177-181

Two-ply Al/Cu sheets were prepared via roll bonding with different reduction ratios. Al/Cu sheets fabricated below 50% of reduction ratio exhibited relatively equiaxed grains without interface reaction, which resulted in weak joint-bonding strength. However, both strong metallurgical bonding at interface and fine, elongated grains from constituent alloys adjacent to the interface were successfully...

article

Asymmetric mechanical properties and tensile behaviour prediction of aluminium alloy 5083 friction stir welding joints

D. Rao, K. Huber, J. Heerens, J.F. dos Santos, more

Materials Science & Engineering A > 2013 > 565 > Complete > 44-50

The asymmetric material flow, severe plastic deformation and thermal cycle imposed on the base material during friction stir welding (FSW) result in unique microstructural development, which causes a gradient in local mechanical properties in the weld region. Micro-tensile and indentation testing were applied to determine the local mechanical properties in a friction stir welded joint. The local stress–strain...

article

Estimation of plastic anisotropy in Ni–5% Al coatings via spherical indentation

Salmon M. Kalkhoran, W. Brian Choi, Andrew Gouldstone

Acta Materialia > 2012 > 60 > 3 > 803-810

Computational models were performed to simulate spherical indentation on the free edge of a material exhibiting anisotropy in plastic behavior. Anisotropy was correlated with out of plane sub-surface deformation fields that persisted after unloading. It was further shown that some aspects of the fields were sensitive only to this anisotropy, and insensitive to yield strain, hardening behavior, elastic...

article

Mechanical testing of titanium/aluminium–silicon interface: Effect of T6 heat treatment

O. Dezellus, M. Zhe, F. Bosselet, D. Rouby, more

Materials Science & Engineering A > 2011 > 528 > 6 > 2795-2803

A previous paper reported on the mechanical behaviour of insert-moulded Ti/Al–7Si bimetallic test pieces as studied by a classical push-out test as well as a variant: the circular bending test. When a chemical bond was formed at the Ti/Al–7Si interface, promising results were obtained in terms of joint strength and damage mechanism (Dezellus et al., 2008 [1]). As a continuation, the aim of the present...

article

Microstructure and mechanical properties of an Si3N4/Si3N4 joint brazed with Au–Ni–Pd–V filler alloy

Y. Sun, J. Zhang, Y.P. Geng, K. Ikeuchi, more

Scripta Materialia > 2011 > 64 > 5 > 414-417

Si ₃ N ₄ ceramics were brazed using Au–Ni–Pd–V filler alloy at 1423K for 60min. The microstructure and mechanical properties of the joints were investigated by scanning and transmission electron microscopy and a three-point bending test. The results indicate that a VN reaction layer was formed at the Si ₃ N ₄ ceramic/filler alloy interface. The central part of the joint...

article

From micro- to nano-scale molding of metals: Size effect during molding of single crystal Al with rectangular strip punches

Ke Chen, W.J. Meng, Fanghua Mei, J. Hiller, more

Acta Materialia > 2011 > 59 > 3 > 1112-1120

A single crystal Al specimen was molded at room temperature with long, rectangular, strip diamond punches. Quantitative molding response curves were obtained at a series of punch widths, ranging from 5μm to 550nm. A significant size effect was observed, manifesting itself in terms of significantly increasing characteristic molding pressure as the punch width decreases to 1.5μm and below. A detailed...

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Search results

Non-contact method for measuring deformation in testing selected materials used in road construction

On the bulk glass formation in the ternary Pd-Ni-S system

Evaluation of mechanical properties in medium carbon steel with a point mode electromagnetic sensor

Hierarchical heterogeneity and an elastic microstructure observed in a metallic glass alloy

The influence of surface oxides on the mechanical response of oxidized grain boundaries

Design, Manufacture, and Quasi-Static Testing of Metallic Negative Stiffness Structures within a Polymer Matrix

Microscopic incompatibility controlling plastic deformation of bicrystals

The local strength of microscopic alumina reinforcements

Deformation behaviour and material properties of austenitic heat-resistant steel X15CrNiSi25-20 subjected to high temperatures and creep

Quench-induced precipitates in Al–Si alloys: Calorimetric determination of solute content and characterisation of microstructure

A new Methodology to Predict Yield Strength Under Biaxial pre-Deformation on Sheet Metals

Grain-boundary cation diffusion in ceria tetragonal zirconia determined by constant-strain-rate deformation tests

Influence of secondary warm rolling on the interface microstructure and mechanical properties of a roll-bonded three-ply Al/Mg/Al sheet

Microscale-calibrated modeling of the deformation response of dual-phase steels

Influence of reduction ratio on the interface microstructure and mechanical properties of roll-bonded Al/Cu sheets

Asymmetric mechanical properties and tensile behaviour prediction of aluminium alloy 5083 friction stir welding joints

Estimation of plastic anisotropy in Ni–5% Al coatings via spherical indentation

Mechanical testing of titanium/aluminium–silicon interface: Effect of T6 heat treatment

Microstructure and mechanical properties of an Si3N4/Si3N4 joint brazed with Au–Ni–Pd–V filler alloy

From micro- to nano-scale molding of metals: Size effect during molding of single crystal Al with rectangular strip punches

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